U-Th-Pb zircon and monazite geochronology of Western Province gneissic rocks, central-south Westland, New Zealand

Figures & data

Fig. 1  Geological map of Western Province basement granitic, gneissic and metasedimentary rocks and key faults in central Westland (modified after Nathan et al. 2002; Cox & Barrell 2007) showing sample locations. The 10 km grid is in NZTM2000 coordinates. The inset map shows the New Zealand basement terranes in the central South Island (after Mortimer 2004).

Table 1  Sample locations and lithological descriptions.

Sample	Location	Latitude (°S)	Longitude (°E)	Elevation (m)	Zircon	Monazite	Description
A546	Mikonui River paragneiss	43.03058	170.89978	329	Y	Y	Typical garnet-biotite paragneiss
A550	Clarke River paragneiss	42.39943	171.87749	302	Y	Y	Typical garnet-biotite paragneiss
A552	Crooked River paragneiss	42.65130	171.61800	174	Y	Y	Typical garnet-biotite paragneiss
A553	Crooked River paragneiss	42.64860	171.61440	171	Y	Y	Typical garnet-biotite paragneiss
A559	Waitangitaona River paragniess	43.29240	170.31170	96	Y	–	Typical garnet-biotite paragneiss
A560	Mt Elliot paragneiss	42.52570	171.82040	200	Y	Y	Typical garnet-biotite paragneiss
A547	Mikonui River orthogneiss	43.02812	170.89981	193	Y	Y	Typical biotite orthogneiss
A548	Solitude Creek orthogneiss	42.99129	170.94165	470	Y	–	Biotite granite derived mylonite
A549	Clarke River orthogneiss	42.39921	171.85563	200	Y	Y	Representative biotite orthogneiss with cross-cutting dike sliver
A551	Mt Elliot orthogneiss	42.52570	171.82040	200	Y	–	Typical biotite orthogneiss
A554	Hokitika Gorge orthogneiss	42.95660	171.01540	78	Y	–	Biotite granite melt derived from metasedimentary migmatite
A555	Mikonui River orthogneiss	43.03090	170.89150	300	Y	–	Biotite orthogneiss occuring with paragneiss
A556	Tuke River orthogneiss	43.02700	170.87450	155	Y	–	Biotite orthogneiss variably mylonitised and cut by mafic and felsic dikes
A557	Bonar Creek orthogneiss	43.08450	170.63910	450	Y	Y	Biotite orthogneiss within 50m of hornfelsed Greenland Group
A558	Whataroa Quarry orthogneiss	43.28460	170.36140	125	Y	–	Strongly lineated biotite orthogneiss

Fig. 2  Tera-Wasserberg concordia diagrams presenting uncorrected ²³⁸U/²⁰⁶Pb–²⁰⁷Pb/²⁰⁶Pb ratios of all zircon analyses.

Fig. 3  Tera-Wasserberg concordia diagrams presenting uncorrected ²³⁸U/²⁰⁶Pb–²⁰⁷Pb/²⁰⁶Pb ratios of all monazite analyses (A–J). Correlations between ²⁰⁶Pb/²³⁸U and ²⁰⁸Pb/²³²Th ages for all monazite analyses (K–T).

Fig. 4  Probability density plots for all samples. Orthogneiss ages >600 Ma omitted for clarity. For all plots ²³⁸U/²⁰⁶Pb ages <800 Ma are corrected for common Pb based on ²⁰⁷Pb. ²⁰⁷Pb/²⁰⁶Pb ages >800 Ma are corrected for common Pb based on ²⁰⁴Pb.

Fig. 5  Zircon cathodoluminesence (CL) and monazite back-scattered electron (BSE) grain images and SHRIMP analytical spot ages for representative (A) paragneiss A546; (C) orthogneiss A551; and (E) orthogneiss A552. Excellent agreement exists between monazite ²⁰⁶Pb/²³⁸U (*) and ²⁰⁸Pb/²³²Th (‘) ages. Cumulative histogram of (B) paragneiss zircon, (D) orthogneiss zircon and (F) combined paragneiss and orthogneiss monazite age structures. For all histograms ²³⁸U/²⁰⁶Pb ages <800 Ma are corrected for common Pb based on ²⁰⁷Pb. ²⁰⁷Pb/²⁰⁶Pb ages >800 Ma are corrected for common Pb based on ²⁰⁴Pb.

Table 2  U-Th-Pb geochronology results from analysis of paragneiss zircon. f₂₀₆ = fraction of common ²⁰⁶Pb of the total measured Pb. Total ratios are given as measured and are uncorrected for common Pb. Correction method 1 is based on ²⁰⁷Pb (with ²³⁸U/²⁰⁶Pb ages <800 Ma). Correction method 2 is based on ²⁰⁴Pb (with ²⁰⁷Pb/²⁰⁶Pb ages >800 Ma).

	U	Th		f206	Total	err	Total	err	Corr.	Age	err
Label	(ppm)	(ppm)	Th/U	(%)	^238U/^206Pb	(1σ)	^207Pb/^206Pb	(1σ)	meth.	(Ma)	(1σ)
Mikonui River paragneiss A546 (43.03058°S, 170.89978°E, 329m)
1.1	1237	66	0.05	0.066	16.650	0.363	0.0546	0.0014	1	375.7	8.1
2.1	858	104	0.13	0.164	10.496	0.229	0.0608	0.0005	1	585.8	12.5
3.1	289	64	0.23	−0.222	5.252	0.117	0.0753	0.0007	2	1054.0	19.9
4.1	96	45	0.48	0.371	17.486	0.461	0.0567	0.0028	1	357.2	9.3
5.1	596	22	0.04	1.172	5.769	0.128	0.0830	0.0007	2	1283.0	17.6
6.1	198	60	0.31	0.330	12.001	0.349	0.0603	0.0010	1	514.3	14.6
7.1	283	151	0.55	0.339	10.153	0.232	0.0628	0.0009	1	603.6	13.4
8.1	467	268	0.59	0.852	2.864	0.063	0.1248	0.0006	2	2022.5	9.0
9.1	1146	222	0.20	−0.288	10.522	0.381	0.0572	0.0008	1	586.9	20.7
10.1	573	253	0.46	0.399	15.532	0.348	0.0579	0.0016	1	400.7	8.8
10.1B	595	236	0.41	0.120	15.231	0.513	0.0559	0.0012	1	409.4	13.5
11.1	177	111	0.65	1.292	6.496	0.152	0.0802	0.0019	2	1165.1	50.0
11.1B	170	104	0.63	−0.182	5.632	0.132	0.0730	0.0010	2	1000.8	28.7
12.1	1122	77	0.07	2.030	19.682	0.441	0.0690	0.0032	1	313.2	7.1
12.1B	1174	75	0.07	0.670	14.188	0.351	0.0610	0.0010	1	436.2	10.6
13.1	223	98	0.45	2.948	9.728	0.238	0.0844	0.0024	1	613.0	14.9
13.1B	204	106	0.54	0.114	6.279	0.143	0.0718	0.0009	2	1016.5	26.7
14.1	518	159	0.32	0.705	7.785	0.173	0.0708	0.0015	1	773.8	16.7
15.1	101	41	0.41	0.545	6.798	0.164	0.0729	0.0020	2	835.0	101.6
16.1	90	30	0.35	0.410	5.829	0.142	0.0765	0.0015	2	1045.9	51.4
17.1	393	106	0.28	1.288	15.884	0.358	0.0648	0.0015	1	388.7	8.7
18.1	54	12	0.23	0.856	5.789	0.199	0.0804	0.0028	2	738.0	213.0
19.1	468	110	0.24	0.028	12.088	0.273	0.0578	0.0008	1	512.2	11.3
20.1	495	113	0.23	0.898	7.010	0.158	0.0749	0.0029	2	1029.0	81.6
21.1	1280	1486	1.20	−0.054	10.441	0.228	0.0592	0.0005	1	589.9	12.6
A−1.1	1301	347	0.28	5.355	2.875	0.086	0.1589	0.0003	2	2442.8	3.5
A–2.1	765	87	0.12	0.396	10.160	0.304	0.0632	0.0010	1	602.9	17.6
A–3.1	310	70	0.23	0.115	9.325	0.296	0.0624	0.0017	1	655.9	20.3
A–4.1	352	187	0.55	0.661	5.527	0.166	0.0804	0.0010	2	1187.1	25.9
A–5.1	2141	1860	0.90	0.492	12.766	0.378	0.0608	0.0008	1	483.8	14.0
n										30
Clarke River paragneiss A550 (42.39943°S, 171.87749°E, 302m)
1.1	877	774	0.91	−0.043	5.500	0.119	0.0750	0.0004	2	1064.7	9.5
2.1	158	77	0.50	−0.008	5.389	0.121	0.0760	0.0008	2	1051.3	29.4
3.1	351	49	0.15	−0.008	7.791	0.171	0.0651	0.0008	1	778.6	16.6
4.1	205	24	0.12	0.340	11.366	0.260	0.0611	0.0009	1	541.8	12.1
5.1	294	87	0.31	0.452	9.475	0.217	0.0648	0.0009	1	644.0	14.4
6.1	301	285	0.98	0.101	10.737	0.253	0.0600	0.0010	1	573.5	13.2
7.1	296	541	1.89	0.266	4.119	0.091	0.0910	0.0006	2	1440.3	13.3
8.1	484	46	0.10	0.699	8.319	0.183	0.0693	0.0018	1	726.9	15.6
9.1	324	169	0.54	0.252	17.323	0.393	0.0558	0.0009	1	360.9	8.1
10.1	295	157	0.55	0.026	12.889	0.288	0.0570	0.0009	1	481.6	10.5
11.1	399	249	0.65	0.216	11.963	0.197	0.0594	0.0010	1	516.4	8.3
12.1	139	38	0.29	0.173	5.979	0.183	0.0738	0.0023	2	918.2	81.2
13.1	612	83	0.14	−0.210	7.737	0.111	0.0636	0.0006	1	785.1	10.9
14.1	139	43	0.32	0.078	6.335	0.104	0.0712	0.0013	2	977.5	39.1
15.1	1419	265	0.19	−0.184	8.926	0.124	0.0608	0.0004	1	685.7	9.3
16.1	127	30	0.24	−0.263	4.994	0.079	0.0771	0.0012	2	1041.7	51.3
17.1	187	171	0.95	−0.903	2.898	0.052	0.1101	0.0010	2	1793.9	16.7
18.1	1189	6	0.01	−0.073	17.642	0.252	0.0530	0.0007	1	355.7	5.0
19.1	610	129	0.22	−0.044	10.558	0.151	0.0591	0.0007	1	583.6	8.2
20.1	80	1	0.01	0.077	9.363	0.166	0.0620	0.0019	1	653.7	11.3
21.1	274	71	0.27	−0.010	10.825	0.164	0.0590	0.0011	1	569.6	8.4
22.1	1523	63	0.04	−0.007	13.738	0.340	0.0560	0.0010	1	453.0	11.0
23.1	420	107	0.26	0.142	12.803	0.189	0.0580	0.0010	1	484.2	7.0
24.1	374	75	0.21	0.157	9.184	0.135	0.0630	0.0009	1	665.3	9.5
25.1	204	51	0.26	−0.075	9.331	0.157	0.0609	0.0012	1	656.7	10.8
A–1.1	1485	318	0.22	0.160	5.584	0.165	0.0760	0.0003	2	1092.5	8.2
A–2.1	846	42	0.05	0.515	7.894	0.235	0.0690	0.0011	1	765.1	22.1
A–3.1	1427	158	0.11	0.808	7.182	0.364	0.0736	0.0023	2	1024.7	62.3
A–4.1	164	201	1.26	0.084	5.814	0.178	0.0740	0.0011	2	1021.7	33.6
A–5.1	167	93	0.58	0.619	12.365	0.399	0.0622	0.0012	1	498.4	15.8
n										30
Crooked River paragneiss A552 (42.65130°S, 171.61800°E, 174m)
1.1	392	30	0.08	0.929	12.412	0.283	0.0646	0.0018	1	495.1	11.1
1.1B	396	29	0.08	−0.459	11.055	0.245	0.0551	0.0006	1	560.7	12.1
2.1	80	29	0.38	8.707	2.163	0.050	0.2205	0.0018	2	2987.0	13.2
2.1B	85	26	0.31	10.446	2.472	0.058	0.2142	0.0014	2	2922.5	11.8
3.1	409	89	0.23	0.419	17.111	0.383	0.0572	0.0009	1	364.6	8.0
3.1B	408	110	0.28	0.629	15.749	0.353	0.0596	0.0008	1	394.4	8.7
4.1	12	1	0.06	20.898	2.354	0.077	0.2966	0.0053	2	3348.0	46.9
4.1B	12	1	0.06	18.604	2.344	0.072	0.2804	0.0046	2	3315.0	38.1
5.1B	193	157	0.84	0.461	3.761	0.087	0.0982	0.0069	2	1518.7	140.1
6.1	438	185	0.44	0.167	14.414	0.318	0.0568	0.0009	1	431.7	9.4
7.1	649	280	0.45	0.019	11.009	0.242	0.0590	0.0005	1	560.4	12.0
8.1	368	3	0.01	0.160	17.289	0.458	0.0551	0.0014	1	361.9	9.4
9.1	347	69	0.21	0.323	6.113	0.136	0.0743	0.0007	2	1039.0	18.3
10.1	270	84	0.32	0.692	6.628	0.148	0.0748	0.0008	2	1023.4	28.0
11.1	417	13	0.03	0.120	18.463	0.278	0.0542	0.0011	1	339.6	5.0
12.1	171	39	0.24	11.246	5.338	0.119	0.1663	0.0019	2	2458.4	27.7
13.1	68	56	0.84	−0.975	4.998	0.089	0.0713	0.0023	2	717.4	148.9
14.1	152	106	0.72	0.118	13.027	0.223	0.0576	0.0016	1	476.2	8.0
15.1	535	101	0.20	−0.089	2.871	0.041	0.1173	0.0006	2	1912.4	9.4
16.1	128	58	0.47	−0.304	5.455	0.090	0.0732	0.0013	2	976.2	40.6
17.1	487	38	0.08	0.528	11.244	0.188	0.0627	0.0009	1	546.5	9.0
18.1	222	43	0.20	0.776	6.876	0.107	0.0745	0.0032	2	1015.1	88.9
19.1	536	221	0.43	2.486	11.409	0.311	0.0782	0.0086	1	528.7	15.2
20.1	107	49	0.47	0.145	3.318	0.063	0.1052	0.0013	2	1658.7	26.1
21.1	661	21	0.03	0.286	19.158	0.282	0.0553	0.0009	1	327.1	4.7
22.1	1187	174	0.15	−0.023	11.043	0.156	0.0586	0.0005	1	559.0	7.7
23.1	542	54	0.10	1.355	9.625	0.291	0.0718	0.0015	1	628.9	18.6
24.1	804	6	0.01	1.316	17.745	0.262	0.0641	0.0078	1	348.9	6.1
25.1	81	40	0.51	13.247	7.206	0.157	0.1729	0.0080	1	732.8	21.8
A–1.1	965	133	0.14	−0.676	3.125	0.106	0.1042	0.0009	2	1696.1	16.9
A–2.1	66	44	0.69	0.560	13.049	0.449	0.0611	0.0022	1	473.4	16.0
A–3.1	1057	19	0.02	−0.126	12.998	0.389	0.0556	0.0011	1	478.4	14.0
A–4.1	201	74	0.38	0.136	8.052	0.244	0.0655	0.0009	1	753.7	22.1
A–5.1	776	204	0.27	−0.032	14.433	0.460	0.0552	0.0008	1	432.0	13.5
n										34
Crooked River paragneiss A553 (42.64860°S, 171.61440°E, 171m)
1.1	205	106	0.53	3.073	24.594	0.620	0.0758	0.0060	1	249.2	6.6
2.1	307	88	0.30	0.267	6.068	0.136	0.0741	0.0010	2	1010.7	31.1
3.1	179	39	0.23	0.880	25.683	0.623	0.0581	0.0018	1	244.1	5.9
4.1	691	122	0.18	0.278	14.540	0.321	0.0576	0.0006	1	427.6	9.3
5.1	325	14	0.04	0.458	58.359	1.411	0.0518	0.0018	1	109.0	2.6
6.1	485	53	0.11	0.313	54.902	0.866	0.0508	0.0016	1	116.0	1.8
7.1	646	186	0.30	−0.014	8.586	0.122	0.0629	0.0006	1	710.3	9.8
8.1	130	26	0.21	1.640	52.315	1.076	0.0615	0.0035	1	120.1	2.5
9.1	517	240	0.48	−0.405	5.765	0.083	0.0704	0.0008	2	927.6	23.2
10.1	113	19	0.18	1.736	52.045	1.123	0.0622	0.0038	1	120.6	2.7
11.1	201	130	0.67	−0.308	5.355	0.082	0.0739	0.0020	2	983.2	63.8
12.1	680	17	0.03	0.720	18.205	0.502	0.0591	0.0009	1	342.3	9.3
13.1	225	18	0.08	3.565	52.186	0.932	0.0767	0.0029	1	118.0	2.2
14.1	569	132	0.24	−0.584	4.980	0.071	0.0746	0.0006	2	1031.6	19.5
15.1	1887	110	0.06	0.179	50.896	0.729	0.0500	0.0008	1	125.2	1.8
16.1	134	10	0.07	0.546	11.497	0.191	0.0626	0.0017	1	534.8	8.7
17.1	938	522	0.57	0.021	10.855	0.210	0.0592	0.0006	1	568.0	10.7
18.1	276	130	0.49	2.862	3.154	0.091	0.1308	0.0033	2	2101.9	44.1
19.1	586	290	0.51	0.471	5.090	0.090	0.0821	0.0006	2	1233.6	15.6
20.1	503	11	0.02	0.684	55.151	0.869	0.0538	0.0017	1	115.1	1.8
21.1	43	32	0.76	1.525	17.444	0.413	0.0659	0.0039	1	354.0	8.4
22.1	458	95	0.22	0.440	50.417	0.810	0.0520	0.0017	1	126.1	2.0
23.1	386	19	0.05	0.539	54.595	0.911	0.0526	0.0020	1	116.4	2.0
24.1	770	126	0.17	0.139	6.459	0.103	0.0711	0.0007	2	948.6	22.0
25.1	412	9	0.02	0.131	52.980	0.869	0.0495	0.0018	1	120.4	2.0
A–1.1	347	44	0.13	−0.034	19.072	0.581	0.0527	0.0020	1	329.6	9.9
A–2.1	630	237	0.39	0.161	58.864	1.858	0.0495	0.0012	1	108.4	3.4
A–3.1	312	186	0.61	−0.377	5.407	0.163	0.0729	0.0019	2	992.8	54.9
A–4.1	166	35	0.22	0.269	60.237	1.963	0.0503	0.0022	1	105.9	3.4
A–5.1	491	20	0.04	0.232	61.719	1.913	0.0499	0.0024	1	103.4	3.2
n										30
Waitangitaona River paragniess A559 (43.29240°S, 170.31170°E, 96m)
1.1	129	130	1.04	0.110	11.517	0.267	0.0591	0.0017	1	536.2	12.2
2.1	420	49	0.12	0.970	11.334	0.252	0.0662	0.0016	1	540.0	11.8
3.1	520	322	0.64	0.015	12.383	0.272	0.0574	0.0006	1	500.6	10.7
4.1	292	199	0.71	0.217	6.051	0.134	0.0737	0.0015	2	1016.6	43.1
5.1	44	15	0.36	−0.448	5.787	0.157	0.0699	0.0022	2	923.0	93.0
6.1	210	160	0.79	1.390	6.409	0.145	0.0814	0.0022	2	1251.9	51.4
7.1	669	507	0.78	−0.078	10.685	0.237	0.0586	0.0005	1	577.2	12.5
8.1	267	48	0.18	0.055	16.438	0.371	0.0547	0.0010	1	380.5	8.5
9.1	800	237	0.31	0.191	12.593	0.274	0.0586	0.0005	1	491.7	10.5
10.1	222	49	0.23	0.690	8.238	0.196	0.0694	0.0011	1	733.7	17.0
11.1	310	130	0.43	0.177	9.792	0.217	0.0621	0.0007	1	625.8	13.5
12.1	641	444	0.72	0.036	13.263	0.292	0.0567	0.0006	1	468.4	10.1
13.1	446	112	0.26	0.548	6.885	0.152	0.0726	0.0006	2	1011.1	16.4
14.1	318	158	0.51	−0.116	9.679	0.223	0.0599	0.0008	1	634.5	14.2
15.1	513	232	0.47	0.479	6.665	0.146	0.0729	0.0007	2	1016.6	20.0
16.1	568	7	0.01	−0.106	16.350	0.360	0.0534	0.0007	1	383.1	8.3
17.1	142	84	0.61	−0.139	9.055	0.212	0.0609	0.0010	1	676.1	15.4
18.1	1138	341	0.31	0.117	12.430	0.269	0.0581	0.0005	1	498.3	10.6
19.1	700	238	0.35	−0.170	10.120	0.280	0.0587	0.0005	1	608.4	16.4
20.1	1314	533	0.42	0.195	9.480	0.205	0.0628	0.0004	1	645.3	13.6
A–1.1	166	112	0.70	0.272	5.557	0.178	0.0771	0.0011	2	1078.2	42.1
A–2.1	154	83	0.56	−0.157	13.277	0.421	0.0551	0.0026	1	468.8	14.6
A–3.1	300	29	0.10	0.472	17.196	0.524	0.0576	0.0011	1	362.7	10.9
A–4.1	293	142	0.50	0.990	14.028	0.440	0.0637	0.0015	1	439.7	13.5
A–5.1	796	175	0.23	−0.115	13.232	0.400	0.0555	0.0019	1	470.2	13.9
n										25
Mt Elliot paragneiss A560 (42.52570°S, 171.82040°E, 200m)
1.1	1491	9	0.01	0.040	17.164	0.314	0.0542	0.0004	1	364.9	6.6
1.2	76	64	0.87	0.442	8.687	0.174	0.0664	0.0013	1	699.4	13.7
2.1	254	86	0.35	0.842	7.354	0.137	0.0732	0.0007	2	974.8	29.0
3.1	268	83	0.32	8.737	3.026	0.056	0.1799	0.0009	2	2648.7	8.4
4.1	1202	5	0.00	0.012	11.533	0.213	0.0583	0.0003	1	536.0	9.7
5.1	106	141	1.37	0.108	10.381	0.204	0.0606	0.0011	1	592.3	11.4
6.1	2017	87	0.04	0.532	9.524	0.193	0.0654	0.0005	1	640.3	12.6
7.1	1037	75	0.07	0.763	11.623	0.215	0.0642	0.0004	1	528.2	9.6
8.1	259	186	0.74	0.535	6.136	0.115	0.0758	0.0006	2	1051.1	29.7
9.1	494	30	0.06	−0.045	13.948	0.259	0.0555	0.0007	1	446.5	8.1
10.1	1647	8	0.01	0.019	18.227	0.333	0.0535	0.0003	1	344.2	6.2
11.1	3181	493	0.16	−0.173	10.259	0.188	0.0585	0.0002	1	600.6	10.7
12.1	2794	26	0.01	−0.016	16.009	0.338	0.0543	0.0003	1	390.7	8.1
13.1	706	162	0.24	−0.127	8.881	0.164	0.0614	0.0008	1	688.7	12.3
14.1	395	342	0.90	0.151	5.580	0.103	0.0760	0.0005	2	1082.7	16.3
15.1	4943	488	0.10	−0.076	11.671	0.245	0.0574	0.0002	1	530.3	10.9
16.1	164	46	0.29	−0.073	5.619	0.115	0.0739	0.0007	2	1013.2	32.7
17.1	717	15	0.02	0.509	13.328	0.256	0.0604	0.0005	1	464.1	8.7
18.1	109	80	0.76	0.227	11.558	0.228	0.0600	0.0012	1	533.8	10.3
19.1	1642	867	0.55	0.469	6.741	0.123	0.0725	0.0003	2	987.0	8.3
20.1	1043	65	0.06	1.610	11.160	0.206	0.0715	0.0008	1	544.7	9.9
A–1.1	404	50	0.13	0.487	4.941	0.149	0.0835	0.0008	2	1261.1	21.1
A–2.1	527	224	0.44	0.927	4.810	0.144	0.0883	0.0005	2	1379.9	13.6
A–3.1	890	47	0.05	0.449	13.174	0.401	0.0601	0.0005	1	469.6	14.0
A–4.1	1632	104	0.07	0.156	18.406	0.550	0.0545	0.0005	1	340.5	10.0
A–5.1	402	180	0.46	0.481	5.170	0.156	0.0816	0.0006	2	1193.4	21.0
n										26

Table 3  U-Th-Pb geochronology results from analysis of orthogneiss zircon. f₂₀₆ = fraction of common ²⁰⁶Pb of the total measured Pb. Total ratios are given as measured and are uncorrected for common Pb. Correction method 1 is based on ²⁰⁷Pb (with ²³⁸U/²⁰⁶Pb ages <800 Ma). Correction method 2 is based on ²⁰⁴Pb (with ²⁰⁷Pb/²⁰⁶Pb ages >800 Ma). Spot analyses used for weighted mean ²⁰⁶Pb/²³⁸U age calculations of selected samples are marked in bold.

	U	Th	Th/U	f206	Total	Error	Total	Error	Corr.	Age	Error
Label	(ppm)	(ppm)		(%)	^238U/^206Pb	(1σ)	^207Pb/^206Pb	(1σ)	meth.	(Ma)	(1σ)
Mikonui River orthogneiss A547 (43.02812°S, 170.89981°E, 193m)
1.1	553	413	0.77	0.003	17.357	0.319	0.0538	0.0005	1	361.1	6.5
2.1	325	79	0.25	0.053	18.242	0.972	0.0538	0.0011	1	343.9	18.0
3.1	2121	375	0.18	−0.034	15.937	0.298	0.0542	0.0002	1	392.4	7.2
4.1	384	49	0.13	0.183	16.711	0.350	0.0555	0.0016	1	374.0	7.7
5.1	280	86	0.32	0.179	17.629	0.339	0.0551	0.0008	1	355.1	6.7
6.1	519	217	0.43	0.035	16.299	0.316	0.0546	0.0006	1	383.7	7.3
7.1	574	404	0.73	0.152	15.404	0.285	0.0560	0.0006	1	404.9	7.4
8.1	247	142	0.59	0.089	16.454	0.311	0.0549	0.0008	1	380.0	7.1
9.1	295	135	0.47	0.203	16.011	0.301	0.0561	0.0007	1	389.8	7.2
10.1	760	52	0.07	−0.200	16.339	0.326	0.0527	0.0005	1	383.7	7.5
11.1	628	116	0.19	−0.007	15.896	0.294	0.0545	0.0007	1	393.3	7.2
A–1.1	988	28	0.03	−0.125	16.698	0.497	0.0531	0.0014	1	375.4	11.0
A–2.1	201	30	0.16	−0.157	16.221	0.509	0.0531	0.0024	1	386.2	12.0
A–3.1	229	76	0.34	0.174	16.186	0.497	0.0558	0.0021	1	385.8	11.7
A–4.1	1073	240	0.23	−0.014	13.073	0.388	0.0565	0.0010	1	475.2	13.8
A–5.1	2434	879	0.37	−0.029	17.915	0.549	0.0533	0.0008	1	350.2	10.6
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										387.1	6.8
n										11/16
MSWD										1.3
Solitude Creek orthogneiss A548 (42.99129°S, 170.94165°E, 470m)
1.1	250	184	0.76	0.547	54.347	1.086	0.0527	0.0015	1	116.9	2.3
2.1	596	186	0.32	0.280	59.669	1.131	0.0504	0.0010	1	106.8	2.0
3.1	703	354	0.52	0.158	54.835	1.040	0.0496	0.0009	1	116.3	2.2
4.1	239	222	0.96	0.305	54.250	1.086	0.0508	0.0015	1	117.4	2.3
5.1	452	445	1.02	0.266	57.715	1.108	0.0503	0.0011	1	110.4	2.1
6.1	534	531	1.03	0.318	57.764	1.102	0.0507	0.0010	1	110.3	2.1
7.1	626	362	0.60	0.152	54.891	1.034	0.0496	0.0009	1	116.2	2.2
8.1	488	312	0.66	0.103	52.912	1.014	0.0493	0.0012	1	120.6	2.3
9.1	503	387	0.80	0.065	55.358	1.051	0.0488	0.0010	1	115.3	2.2
10.1	331	288	0.90	−0.089	58.614	1.168	0.0475	0.0012	1	109.1	2.2
A–1.1	591	449	0.78	0.306	59.255	1.803	0.0506	0.0012	1	107.6	3.3
A–2.1	340	320	0.97	0.398	55.522	1.717	0.0515	0.0015	1	114.6	3.5
A–3.1	340	292	0.89	0.505	55.990	1.859	0.0523	0.0015	1	113.5	3.8
A–4.1	969	867	0.93	0.074	55.454	1.664	0.0489	0.0009	1	115.1	3.4
A–5.1	373	324	0.90	0.230	55.625	1.716	0.0501	0.0014	1	114.6	3.5
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										114.5	2.0
n										11/15
MSWD										1.2
Clarke River orthogneiss A549 (42.39921°S, 171.85563°E, 253m)
1.1	193	77	0.41	0.060	16.509	0.390	0.0547	0.0014	1	378.9	8.8
2.1	517	249	0.50	0.022	15.910	0.355	0.0547	0.0008	1	392.9	8.6
3.1	215	72	0.34	0.349	16.915	0.400	0.0568	0.0014	1	369.0	8.6
4.1	194	99	0.53	0.713	16.674	0.395	0.0598	0.0015	1	372.9	8.7
5.1	258	116	0.46	0.242	16.252	0.375	0.0563	0.0012	1	384.0	8.7
6.1	720	274	0.39	0.153	16.773	0.374	0.0553	0.0007	1	372.7	8.2
7.1	127	52	0.42	0.844	18.106	0.451	0.0601	0.0026	1	343.7	8.5
8.1	766	197	0.27	5.881	16.557	0.366	0.1011	0.0043	1	356.4	8.4
9.1	1175	351	0.31	3.608	13.180	0.287	0.0853	0.0012	1	455.0	9.9
10.1	678	316	0.48	0.182	13.266	0.293	0.0579	0.0008	1	467.7	10.1
11.1	1469	209	0.15	0.050	16.041	0.349	0.0549	0.0005	1	389.6	8.3
A–1.1	593	245	0.43	−0.135	16.661	0.499	0.0530	0.0007	1	376.2	11.1
A–2.1	963	121	0.13	−0.066	16.337	0.486	0.0538	0.0007	1	383.2	11.2
A–3.1	260	79	0.32	−0.069	16.447	0.500	0.0537	0.0010	1	380.8	11.4
A–4.1	457	145	0.33	0.078	16.466	0.495	0.0548	0.0008	1	379.8	11.2
A–5.1	263	167	0.65	0.204	16.128	0.491	0.0560	0.0010	1	387.0	11.6
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										378.1	6.8
n										13/16
MSWD										1.2
Mt Elliot orthogneiss A551 (42.52570°S, 171.82040°E, 200m)
1.1	472	49	0.11	0.431	17.405	0.390	0.0572	0.0009	1	358.6	7.9
2.1	2325	110	0.05	0.017	46.343	1.011	0.0489	0.0006	1	137.6	3.0
3.1	940	266	0.29	5.468	11.814	0.258	0.1016	0.0008	1	496.2	11.2
4.1	281	57	0.21	2.022	14.844	0.349	0.0713	0.0018	1	412.0	9.6
5.1	659	33	0.05	0.222	19.149	0.425	0.0548	0.0008	1	327.4	7.2
6.1	1718	128	0.08	0.403	15.443	0.335	0.0580	0.0008	1	402.9	8.6
7.1	1320	160	0.13	0.258	43.079	0.951	0.0510	0.0008	1	147.6	3.2
8.1	492	100	0.21	1.220	17.768	0.404	0.0633	0.0010	1	348.8	7.8
9.1	2085	418	0.21	0.136	48.172	1.056	0.0498	0.0007	1	132.3	2.9
10.1	444	155	0.36	0.227	54.224	1.285	0.0502	0.0016	1	117.5	2.8
A–1.1	2629	791	0.31	0.048	52.064	1.550	0.0489	0.0006	1	122.6	3.6
A–1.2	466	290	0.64	0.313	51.089	1.565	0.0510	0.0013	1	124.6	3.8
A–2.1	2531	630	0.26	0.019	49.552	1.471	0.0488	0.0007	1	128.8	3.8
A–3.1	2892	621	0.22	0.202	51.340	1.527	0.0501	0.0005	1	124.1	3.7
A–4.1	136	201	1.52	−0.202	16.972	0.532	0.0523	0.0014	1	369.8	11.4
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										127.0	6.9
n										7/15
MSWD										5.1
Hokitika Gorge orthogneiss A554 (42.95660°S, 171.01540°E, 78m)
1.1	957	464	0.50	0.603	57.511	1.281	0.0530	0.0012	1	110.5	2.5
2.1	1184	708	0.62	0.177	52.481	1.154	0.0499	0.0007	1	121.5	2.7
3.1	2577	854	0.34	−0.004	55.934	1.216	0.0483	0.0005	1	114.2	2.5
4.1	1390	415	0.31	0.070	56.223	1.235	0.0488	0.0007	1	113.6	2.5
5.1	813	289	0.37	0.070	16.916	0.369	0.0545	0.0005	1	370.0	7.9
6.1	3992	783	0.20	0.211	54.030	1.169	0.0501	0.0004	1	118.0	2.5
7.1	775	503	0.67	0.217	55.649	1.271	0.0500	0.0010	1	114.6	2.6
8.1	1360	869	0.66	−0.132	55.470	1.225	0.0473	0.0008	1	115.3	2.5
9.1	3334	843	0.26	0.199	55.517	1.204	0.0499	0.0005	1	114.9	2.5
10.1	2268	913	0.42	0.029	53.018	1.162	0.0487	0.0006	1	120.4	2.6
A–1.1	2899	976	0.35	−0.086	54.877	1.637	0.0477	0.0007	1	116.5	3.5
A–2.1	2487	837	0.35	−0.064	54.632	1.628	0.0479	0.0007	1	117.0	3.5
A–3.1	615	38	0.06	0.074	57.866	1.758	0.0488	0.0016	1	110.4	3.3
A–4.1	2794	887	0.33	0.199	51.120	1.539	0.0501	0.0012	1	124.6	3.7
A–5.1	3411	936	0.28	−0.001	54.318	1.611	0.0484	0.0004	1	117.6	3.5
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										116.0	2.3
n										14/15
MSWD										1.8
Mikonui River orthogneiss A555 (43.03090°S, 170.89150°E, 300m)
1.1	518	293	0.59	0.227	57.003	1.318	0.0501	0.0013	1	111.9	2.6
2.1	634	186	0.30	0.566	20.053	0.450	0.0572	0.0022	1	312.0	7.0
3.1	385	305	0.82	0.641	57.523	1.330	0.0533	0.0014	1	110.4	2.5
4.1	444	241	0.56	0.193	56.532	1.294	0.0498	0.0012	1	112.8	2.6
5.1	356	263	0.76	0.453	52.272	1.207	0.0521	0.0013	1	121.6	2.8
6.1	480	238	0.51	0.557	56.403	1.280	0.0527	0.0012	1	112.7	2.5
7.1	256	154	0.62	0.416	55.019	1.304	0.0516	0.0016	1	115.6	2.7
8.1	232	171	0.76	0.566	56.092	1.349	0.0528	0.0017	1	113.3	2.7
A–1.1	2323	1121	0.50	0.053	5.555	0.165	0.0754	0.0004	2	1077.8	10.5
A–2.1	476	216	0.47	0.367	55.516	1.718	0.0512	0.0015	1	114.7	3.5
A–3.1	331	186	0.58	0.392	55.128	1.707	0.0514	0.0015	1	115.4	3.6
A–4.1	846	616	0.75	0.211	56.780	1.767	0.0499	0.0013	1	112.3	3.5
A–5.1	2647	1975	0.77	0.014	53.503	1.586	0.0485	0.0005	1	119.4	3.5
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										114.2	2.4
n										11/13
MSWD										1.4
Tuke River orthogneiss A556 (43.02700°S, 170.87450°E, 155m)
1.1	438	150	0.35	0.066	16.397	0.322	0.0548	0.0008	1	381.4	7.4
2.1	300	130	0.45	0.141	16.652	0.313	0.0552	0.0008	1	375.4	6.9
3.1	692	197	0.29	0.029	16.503	0.305	0.0544	0.0005	1	379.1	6.9
4.1	361	119	0.34	0.131	16.560	0.337	0.0552	0.0007	1	377.5	7.6
5.1	1130	315	0.29	0.011	17.370	0.317	0.0538	0.0004	1	360.8	6.5
6.1	979	386	0.41	0.098	17.737	0.326	0.0544	0.0006	1	353.2	6.4
7.1	918	203	0.23	0.091	17.858	0.329	0.0543	0.0006	1	350.9	6.4
8.1	462	100	0.22	2.614	2.718	0.050	0.1442	0.0051	2	2267.3	61.9
9.1	317	85	0.28	0.709	13.587	0.256	0.0618	0.0007	1	454.7	8.4
10.1	610	439	0.74	0.175	16.046	0.301	0.0558	0.0007	1	389.1	7.2
A–1.1	1189	347	0.30	0.045	17.833	0.540	0.0539	0.0005	1	351.6	10.5
A–2.1	151	45	0.31	0.218	19.016	0.588	0.0548	0.0020	1	329.7	10.1
A–3.1	285	133	0.48	−0.058	16.351	0.528	0.0538	0.0009	1	382.9	12.1
A–4.1	509	172	0.35	−0.120	15.776	0.471	0.0536	0.0007	1	396.7	11.6
A–5.1	560	196	0.36	0.005	16.437	0.492	0.0543	0.0009	1	380.7	11.2
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										370.6	9.9
n										12/15
MSWD										3.7
Bonar Creek orthogneiss A557 (43.08450°S, 170.63910°E, 450m)
1.1	356	153	0.44	−0.054	15.978	0.356	0.0541	0.0008	1	391.5	8.6
2.1	491	138	0.29	0.401	12.278	0.270	0.0606	0.0007	1	502.8	10.8
3.1	301	149	0.51	−0.044	17.115	0.387	0.0535	0.0010	1	366.2	8.1
4.1	297	126	0.44	0.127	15.978	0.359	0.0555	0.0009	1	390.9	8.6
5.1	168	50	0.31	0.165	15.668	0.375	0.0560	0.0013	1	398.2	9.4
6.1	768	319	0.43	0.021	15.910	0.347	0.0547	0.0006	1	392.9	8.4
7.1	207	63	0.32	0.296	15.236	0.347	0.0573	0.0013	1	408.6	9.1
8.1	624	434	0.72	−0.049	16.284	0.357	0.0539	0.0006	1	384.4	8.3
9.1	488	185	0.39	0.032	16.405	0.362	0.0545	0.0007	1	381.3	8.3
10.1	493	192	0.40	0.425	16.260	0.359	0.0577	0.0008	1	383.1	8.3
A–1.1	296	119	0.41	0.020	17.088	0.516	0.0541	0.0009	1	366.6	10.9
A–2.1	271	54	0.21	−0.016	16.355	0.498	0.0541	0.0012	1	382.6	11.5
A–3.1	455	234	0.53	−0.059	16.245	0.486	0.0539	0.0007	1	385.3	11.3
A–4.1	159	38	0.25	0.747	6.662	0.203	0.0751	0.0016	2	987.9	52.6
A–5.1	6908	1756	0.26	−0.097	15.875	0.468	0.0538	0.0002	1	394.2	11.4
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										386.5	7.5
n										13/15
MSWD										1.6
Whataroa Quarry orthogneiss A558 (43.28460°S, 170.36140°E, 125m)
1.1	2317	1579	0.70	0.026	74.935	1.376	0.0479	0.0006	1	85.4	1.6
3.1	603	407	0.70	0.087	67.959	1.297	0.0486	0.0010	1	94.1	1.8
4.1	929	31	0.03	0.053	15.870	0.493	0.0550	0.0010	1	393.7	12.0
11.1	216	162	0.77	8.399	68.082	2.326	0.0921	0.0051	1	89.5	3.1
12.1	116	88	0.78	0.000	70.841	3.028	0.0696	0.0054	1	88.2	3.8
13.1	211	230	1.13	5.130	65.216	2.160	0.0614	0.0036	1	96.7	3.2
14.1	130	96	0.76	7.896	64.464	2.250	0.0701	0.0046	1	96.8	3.4
15.1	1472	803	0.56	0.699	72.376	2.160	0.0488	0.0012	1	88.4	2.6
16.1	814	409	0.52	1.125	62.951	1.908	0.0510	0.0017	1	101.3	3.1
17.1	260	193	0.77	1.965	69.402	2.503	0.0593	0.0047	1	91.1	3.3
18.1	115	86	0.78	4.618	67.654	2.448	0.0736	0.0054	1	91.9	3.4
19.1	407	348	0.88	1.924	66.786	2.077	0.0563	0.0033	1	94.9	3.0
20.1	1553	1214	0.81	0.700	67.913	2.029	0.0509	0.0011	1	93.9	2.8
A–1.1	347	397	1.18	0.098	73.954	2.321	0.0485	0.0017	1	86.5	2.7
A–2.1	1668	1178	0.73	−0.032	69.960	2.088	0.0476	0.0007	1	91.5	2.7
A–3.1	93	72	0.79	−0.018	72.188	2.564	0.0476	0.0031	1	88.7	3.2
A–4.1	3271	3055	0.97	0.039	68.781	2.045	0.0482	0.0005	1	93.0	2.8
A–5.1	464	138	0.31	−0.314	12.026	0.360	0.0551	0.0011	1	516.5	15.1
Weighted mean ^206Pb/^238U age ± 95% c.l. (Ma)										92.0	1.9
n										14/18
MSWD										1.2

Table 4  U-Th-Pb geochronology results from analysis of paragneiss and orthogneiss monazite. f₂₀₆ or f₂₀₈ = fraction of common ²⁰⁶Pb or ²⁰⁸Pb of the total measured Pb. Total ratios are given as measured and are uncorrected for common Pb. Correction is based on ²⁰⁷Pb. Spot analyses used for weighted mean ²⁰⁶Pb/²³⁸U or ²⁰⁸Pb/²³²Th age calculations of selected samples are marked in bold.

	U	Th	Th/U	f206	f208	Total	Error	Total	Error	Total	Error	Total	Error	^206Pb/^238U	Error	^208Pb/^232Th	Error
Label	(ppm)	(ppm)		(%)	(%)	^208Pb/^206Pb	(1σ)	^238U/^206Pb	(1σ)	^207Pb/^206Pb	(1σ)	^208Pb/^232Th	(1σ)	Age (Ma)	(1σ)	Age (Ma)	(1σ)
Mikonui River paragneiss A546 (43.03058°S, 170.89978°E, 329m)
1.1	232	5048	21.74	−0.056	−0.020	6.256	0.027	14.592	0.271	0.0549	0.0004	0.02036	0.00023	427.5	7.7	407.4	4.5
2.1	169	3902	23.15	2.310	1.059	4.860	0.039	32.716	0.447	0.0711	0.0011	0.00698	0.00010	189.7	2.6	139.1	2.0
3.1	205	3062	14.95	0.096	0.049	4.313	0.019	17.020	0.222	0.0548	0.0003	0.01856	0.00022	367.7	4.7	371.5	4.4
4.1	194	2667	13.73	0.083	0.046	4.040	0.012	17.259	0.252	0.0546	0.0003	0.01902	0.00022	362.8	5.2	380.6	4.3
5.1	213	2531	11.90	0.073	0.047	3.438	0.012	17.541	0.245	0.0543	0.0003	0.01828	0.00022	357.2	4.9	365.9	4.3
6.1	150	1553	10.35	0.139	0.102	3.030	0.010	17.145	0.199	0.0551	0.0003	0.01894	0.00022	364.9	4.1	378.9	4.4
7.1	175	5484	31.32	0.576	0.142	9.056	0.042	57.373	0.916	0.0535	0.0006	0.00548	0.00009	110.8	1.8	110.3	1.9
8.1	189	3169	16.75	0.309	0.168	4.105	0.022	26.559	0.335	0.0538	0.0004	0.01009	0.00013	237.5	2.9	202.7	2.7
9.1	186	5206	28.03	0.501	0.139	8.056	0.076	56.841	0.921	0.0529	0.0011	0.00552	0.00008	111.9	1.8	111.2	1.6
10.1	183	3028	16.54	0.951	0.514	4.119	0.021	26.093	0.436	0.0597	0.0005	0.01070	0.00013	240.2	3.9	214.1	2.6
n														10		10
Clarke River paragneiss A550 (42.39943°S, 171.87749°E, 302m)
1.1	204	1510	7.39	0.313	0.369	1.891	0.013	34.718	0.477	0.0526	0.0004	0.00836	0.00010	182.5	2.5	167.6	2.1
2.1	25	5	0.20	0.445	15.702	0.063	0.001	30.902	0.367	0.0543	0.0005	0.01523	0.00037	204.4	2.4	257.8	8.0
3.1	28	5	0.18	0.441	17.586	0.056	0.001	31.150	0.386	0.0542	0.0003	0.01560	0.00031	202.8	2.5	258.2	5.9
4.1	227	824	3.63	0.182	0.362	1.122	0.006	54.342	0.720	0.0500	0.0003	0.00640	0.00008	117.3	1.5	128.5	1.5
5.1	667	72	0.11	0.464	29.308	0.035	0.001	30.752	0.364	0.0545	0.0004	0.01482	0.00065	205.4	2.4	210.6	11.0
6.1	183	1674	9.16	0.372	0.317	2.612	0.013	28.638	0.482	0.0540	0.0005	0.01125	0.00021	220.5	3.7	225.3	4.1
7.1	202	1602	7.93	0.115	0.108	2.373	0.010	20.210	0.226	0.0536	0.0002	0.01649	0.00019	311.0	3.4	330.3	3.8
8.1	215	1410	6.57	0.414	0.412	2.240	0.011	29.381	0.363	0.0542	0.0006	0.01310	0.00014	214.9	2.6	262.0	2.9
9.1	208	2259	10.88	0.154	0.109	3.138	0.012	19.968	0.264	0.0541	0.0003	0.01668	0.00018	314.6	4.1	333.9	3.5
10.1	29	4	0.14	0.416	20.483	0.045	0.001	30.772	0.411	0.0540	0.0003	0.01545	0.00036	205.3	2.7	246.8	6.9
A–1.1	203	1559	7.70	−0.512	−0.457	2.369	0.020	14.456	0.235	0.0550	0.0003	0.01890	0.00033	433.3	6.8	380.1	6.6
A–2.1	178	845	4.74	−0.420	−0.520	1.706	0.010	52.497	0.960	0.0557	0.0005	0.00628	0.00010	122.2	2.2	127.2	2.1
A–3.1	180	1508	8.36	−0.538	−0.444	2.565	0.015	15.749	0.249	0.0547	0.0005	0.01744	0.00032	398.9	6.1	351.1	6.4
A–4.1	201	1056	5.26	−0.906	−1.112	1.721	0.015	50.454	1.086	0.0517	0.0004	0.00572	0.00015	127.7	2.7	116.6	3.0
n														14		14
Crooked River paragneiss A552 (42.65130°S, 171.61800°E, 174m)
1.1	214	8832	41.24	0.767	0.147	11.606	0.093	58.619	1.099	0.0552	0.0010	0.00541	0.00008	108.2	2.0	108.9	1.6
2.1	198	10144	51.17	0.861	0.133	14.469	0.127	60.260	1.076	0.0560	0.0013	0.00521	0.00007	105.2	1.9	104.9	1.5
3.1	182	5057	27.72	0.678	0.194	7.789	0.133	58.812	0.810	0.0544	0.0006	0.00533	0.00011	108.0	1.5	107.3	2.1
4.1	209	25666	122.65	6.627	0.456	32.377	0.381	52.802	1.175	0.1090	0.0031	0.00544	0.00007	113.0	2.5	109.2	1.3
5.1	203	6677	32.93	0.678	0.159	9.486	0.062	58.352	0.800	0.0544	0.0012	0.00552	0.00007	108.8	1.5	111.1	1.3
6.1	218	5565	25.48	0.579	0.175	7.373	0.056	59.805	0.981	0.0534	0.0009	0.00549	0.00007	106.3	1.7	110.4	1.3
6.2	229	4930	21.57	0.558	0.200	6.207	0.051	59.470	0.978	0.0533	0.0006	0.00543	0.00007	106.9	1.7	109.3	1.4
7.1	191	9845	51.48	0.990	0.153	14.455	0.103	58.798	1.320	0.0572	0.0009	0.00536	0.00007	107.7	2.4	107.9	1.5
8.1	179	9244	51.68	1.033	0.158	14.574	0.113	59.739	1.058	0.0576	0.0017	0.00524	0.00007	105.9	1.9	105.5	1.3
9.1	175	16216	92.46	1.642	0.141	25.970	0.218	58.910	1.465	0.0632	0.0012	0.00535	0.00007	106.7	2.6	107.8	1.3
A–2.1	252	29513	117.00	2.199	0.128	36.436	0.515	51.730	1.510	0.0771	0.0031	0.00525	0.00007	120.7	3.5	105.8	1.5
A–5.1	221	36729	166.41	1.484	0.081	38.614	0.860	27.870	1.041	0.0712	0.0034	0.00556	0.00009	223.9	8.3	112.0	1.7
Weighted mean age ± 95% c.l. (Ma)														107.5	1.6	108.3	1.7
n														10/12		12/12
MSWD													1.0		2.4
Crooked River paragneiss A553 (42.64860°S, 171.61440°E, 171m)
1.1	349	17705	50.80	1.374	0.211	14.544	0.195	54.916	1.440	0.0609	0.0014	0.00592	0.00008	114.8	3.0	119.1	1.7
1.2	251	12943	51.59	0.843	0.125	15.040	0.123	56.209	1.363	0.0560	0.0010	0.00579	0.00008	112.7	2.7	116.6	1.6
2.1	234	5247	22.39	0.470	0.162	6.461	0.033	58.950	0.826	0.0525	0.0006	0.00553	0.00006	107.9	1.5	111.4	1.2
3.1	290	17171	59.20	1.210	0.158	17.082	0.126	55.962	1.044	0.0594	0.0012	0.00580	0.00008	112.8	2.1	116.6	1.6
4.1	200	4159	20.76	0.445	0.165	5.986	0.058	58.436	1.005	0.0523	0.0007	0.00556	0.00009	108.9	1.9	111.8	1.9
5.1	326	14873	45.60	1.386	0.236	13.108	0.184	57.064	1.547	0.0609	0.0019	0.00562	0.00008	110.5	3.0	112.9	1.7
5.2	345	19215	55.63	2.215	0.326	15.142	0.124	54.881	1.121	0.0686	0.0026	0.00542	0.00006	113.9	2.3	108.9	1.3
6.1	267	17538	65.71	0.978	0.115	18.958	0.179	60.739	1.409	0.0571	0.0013	0.00532	0.00006	104.3	2.4	107.1	1.3
7.1	249	20672	82.98	1.985	0.194	22.797	0.336	58.286	1.389	0.0664	0.0015	0.00522	0.00007	107.5	2.6	105.0	1.4
8.1	226	24252	107.40	1.358	0.103	29.321	0.289	55.958	1.425	0.0607	0.0015	0.00543	0.00007	112.7	2.9	109.2	1.4
A–4.1	233	32033	137.31	1.936	0.112	36.446	0.558	39.062	1.335	0.0749	0.0038	0.00541	0.00010	159.8	5.5	108.8	2.1
A–5.1	187	28979	155.37	1.981	0.084	49.687	0.971	57.014	2.418	0.0753	0.0038	0.00509	0.00010	109.9	4.7	102.5	1.9
Weighted mean age ± 95% c.l. (Ma)														110.0	2.4	110.5	2.7
n														11/12		8/12
MSWD													1.8		4.0
Mt Elliot paragneiss A560 (42.52570°S, 171.82040°E, 200m)
1.1	160	1898	11.89	0.350	0.227	3.425	0.018	34.184	0.510	0.0530	0.0003	0.00969	0.00011	185.2	2.7	194.5	2.2
3.1	194	1272	6.56	0.063	0.078	1.811	0.009	18.111	0.236	0.0540	0.0003	0.01783	0.00023	346.2	4.4	357.0	4.6
4.1	237	1575	6.64	0.204	0.237	1.914	0.019	56.869	0.832	0.0501	0.0004	0.00585	0.00008	112.1	1.6	117.6	1.7
5.1	209	1755	8.38	0.241	0.287	1.869	0.012	27.086	0.401	0.0530	0.0004	0.00961	0.00013	233.2	3.4	192.9	2.6
6.1	233	1435	6.16	0.503	0.650	1.724	0.011	50.348	0.781	0.0532	0.0007	0.00654	0.00011	126.2	1.9	130.8	2.3
7.1	242	2147	8.87	0.961	0.922	2.324	0.025	51.293	0.951	0.0573	0.0011	0.00524	0.00007	123.3	2.3	104.7	1.4
8.1	240	1475	6.14	0.179	0.230	1.728	0.007	18.155	0.235	0.0550	0.0003	0.01797	0.00021	345.0	4.4	359.1	4.2
8.2	211	1452	6.88	0.129	0.149	1.938	0.011	18.960	0.263	0.0542	0.0003	0.01727	0.00020	330.9	4.5	345.5	4.0
9.1	210	2631	12.53	0.223	0.141	3.514	0.033	60.835	0.763	0.0502	0.0005	0.00530	0.00007	104.9	1.3	106.8	1.4
n														9		9
Mikonui River orthogneiss A547 (43.02812°S, 170.89981°E, 193m)
1.1	188	4483	23.87	0.554	0.178	6.950	0.043	53.345	0.708	0.0535	0.0006	0.00605	0.00008	119.1	1.6	121.7	1.5
1.1B	191	9170	48.10	0.525	0.110	10.654	0.047	24.931	0.420	0.0561	0.0006	0.00976	0.00013	252.2	4.2	196.1	2.6
2.1	196	4010	20.41	0.623	0.231	6.022	0.054	57.426	0.844	0.0539	0.0005	0.00564	0.00008	110.6	1.6	113.5	1.5
4.1	190	4107	21.57	0.109	0.049	4.934	0.023	18.366	0.264	0.0543	0.0003	0.01406	0.00017	341.4	4.8	282.1	3.4
5.1	251	14122	56.16	0.754	0.153	11.006	0.123	33.150	0.741	0.0568	0.0011	0.00646	0.00009	190.2	4.2	129.9	1.8
6.1	322	3197	9.93	0.043	0.033	2.914	0.015	17.150	0.255	0.0543	0.0003	0.01891	0.00024	365.2	5.3	378.5	4.7
6.2	118	1875	15.93	0.129	0.062	4.645	0.009	17.901	0.210	0.0547	0.0003	0.01828	0.00025	350.0	4.0	365.9	4.9
7.1	177	42043	237.75	2.911	0.107	60.539	1.066	51.047	1.672	0.0751	0.0024	0.00533	0.00007	121.5	4.0	107.4	1.4
7.2	173	27805	160.84	1.177	0.090	29.193	0.265	27.711	0.716	0.0615	0.0024	0.00723	0.00009	225.9	5.8	145.5	1.9
8.1	326	2286	7.01	0.051	0.057	2.009	0.007	17.387	0.267	0.0542	0.0003	0.01826	0.00020	360.3	5.4	365.4	3.9
A–1.1	195	55217	283.81	4.410	0.117	79.467	1.732	47.060	1.918	0.0951	0.0042	0.00513	0.00007	129.6	5.3	103.3	1.5
A–2.1	170	3571	20.98	−0.674	−0.222	6.413	0.053	48.620	0.674	0.0536	0.0013	0.00554	0.00007	132.1	1.8	111.8	1.3
A–3.1	198	4092	20.71	−0.454	−0.149	6.431	0.021	14.653	0.225	0.0554	0.0004	0.01882	0.00021	427.4	6.4	377.5	4.2
A–4.1	205	15600	75.97	0.082	0.009	19.102	0.262	35.363	0.931	0.0598	0.0014	0.00613	0.00008	179.6	4.7	123.5	1.6
A–5.1	229	58674	255.96	3.338	0.093	75.570	1.393	45.614	1.696	0.0864	0.0035	0.00562	0.00006	135.2	5.0	113.2	1.3
n														15		15
Clarke River orthogneiss A549 (42.39921°S, 171.85563°E, 253m)
1.1	186	2125	11.40	0.044	0.030	3.322	0.016	17.162	0.247	0.0543	0.0003	0.01931	0.00025	364.9	5.1	386.5	5.0
2.1	259	1475	5.70	0.938	1.129	1.852	0.015	10.592	0.140	0.0679	0.0010	0.01997	0.00028	576.4	7.3	395.2	5.5
3.1	240	2222	9.25	0.055	0.044	2.783	0.011	17.884	0.249	0.0540	0.0004	0.01872	0.00025	350.6	4.8	374.8	4.9
4.1	12	3	0.26	1.781	44.368	0.089	0.002	40.003	0.521	0.0655	0.0006	0.01203	0.00043	156.4	2.0	134.9	5.3
5.1	185	85	0.46	0.421	6.425	0.146	0.001	30.559	0.370	0.0541	0.0003	0.01542	0.00027	206.7	2.5	289.5	5.3
6.1	199	5103	25.70	0.673	0.186	8.085	0.041	19.418	0.303	0.0590	0.0006	0.01624	0.00018	321.6	4.9	325.0	3.5
7.1	189	1977	10.44	0.023	0.017	3.063	0.012	16.948	0.219	0.0542	0.0005	0.02025	0.00023	369.5	4.7	405.1	4.6
8.1	245	2012	8.22	1.056	0.807	2.917	0.027	41.704	0.595	0.0587	0.0005	0.00947	0.00014	151.2	2.1	189.0	2.7
9.1	13	2	0.17	0.363	14.858	0.054	0.000	28.808	0.307	0.0539	0.0004	0.01569	0.00031	219.2	2.3	268.2	7.0
10.1	187	5121	27.45	0.107	0.030	7.876	0.118	17.179	0.402	0.0548	0.0011	0.01789	0.00022	364.4	8.3	358.3	4.3
A–1.1	174	1292	7.43	−0.635	−0.578	2.326	0.011	18.421	0.487	0.0540	0.0005	0.01547	0.00022	342.9	8.8	312.2	4.5
A–4.1	168	923	5.50	−0.538	−0.674	1.688	0.012	15.658	0.265	0.0547	0.0003	0.01755	0.00026	401.2	6.6	354.0	5.2
A–5.1	148	3969	26.88	−0.348	−0.085	8.660	0.037	17.003	0.233	0.0563	0.0005	0.01681	0.00021	369.6	4.9	337.3	4.1
A–6.1	202	34	0.17	−0.512	−19.496	0.056	0.002	23.895	1.238	0.0550	0.0012	0.01692	0.00085	265.6	13.5	404.6	29.8
A–8.1	166	5205	31.37	−0.457	−0.099	9.723	0.087	14.293	0.420	0.0554	0.0010	0.01897	0.00057	437.9	12.5	380.1	11.2
n														15		15
Bonar Creek orthogneiss A557 (43.08450°S, 170.63910°E, 450m)
1.1	173	2488	14.37	0.034	0.019	4.075	0.019	18.161	0.267	0.0537	0.0003	0.01795	0.00020	345.4	4.9	359.5	4.0
2.1	199	2879	14.47	0.087	0.046	4.254	0.017	17.560	0.277	0.0545	0.0003	0.01887	0.00023	356.7	5.5	377.6	4.5
3.1	178	2327	13.07	0.124	0.076	3.645	0.018	17.143	0.218	0.0550	0.0005	0.01830	0.00023	365.0	4.5	366.3	4.5
4.1	131	2267	17.28	0.099	0.045	4.936	0.014	18.226	0.255	0.0543	0.0004	0.01784	0.00019	344.0	4.7	357.3	3.9
5.1	184	2527	13.77	0.036	0.020	3.990	0.026	17.171	0.215	0.0542	0.0003	0.01868	0.00023	364.8	4.5	374.0	4.5
6.1	168	1645	9.77	−0.012	−0.010	2.734	0.011	19.173	0.220	0.0529	0.0002	0.01678	0.00019	327.8	3.7	336.3	3.8
7.1	158	2636	16.66	0.142	0.067	4.702	0.024	18.189	0.249	0.0547	0.0003	0.01753	0.00020	344.5	4.6	351.0	4.0
8.1	250	3625	14.50	0.116	0.059	4.343	0.024	14.316	0.266	0.0566	0.0006	0.02141	0.00026	434.8	7.8	428.0	5.2
9.1	121	2102	17.37	0.110	0.050	4.906	0.024	18.534	0.219	0.0542	0.0003	0.01749	0.00020	338.4	3.9	350.3	3.9
10.1	211	3906	18.47	1.095	0.498	4.900	0.026	17.647	0.253	0.0636	0.0006	0.01687	0.00022	351.5	4.9	336.4	4.4
n														10		10
Nile River Charleston paragneiss 90–427 (Ireland and Gibson, 1998)
1.1	179	2296	12.80	0.183	0.108	3.762	0.011	17.120	0.232	0.0555	0.0002	0.01905	0.00021	365.3	4.8	381.0	4.2
2.1	465	1450	3.12	0.049	0.120	0.904	0.004	17.176	0.231	0.0543	0.0002	0.01921	0.00028	364.6	4.8	384.2	5.5
3.1	198	1744	8.80	0.061	0.054	2.545	0.010	17.558	0.238	0.0542	0.0003	0.01848	0.00024	356.9	4.7	369.9	4.7
4.1	196	2355	12.01	0.078	0.050	3.473	0.009	17.160	0.259	0.0546	0.0002	0.01867	0.00020	364.9	5.4	373.8	4.1
5.1	205	1979	9.68	0.095	0.076	2.784	0.009	17.493	0.235	0.0546	0.0003	0.01849	0.00020	358.0	4.7	370.0	3.9
6.1	207	2555	12.35	0.051	0.032	3.578	0.009	17.567	0.201	0.0541	0.0004	0.01871	0.00021	356.7	4.0	374.6	4.1
7.1	247	2446	9.91	0.098	0.076	2.892	0.015	17.546	0.301	0.0546	0.0004	0.01889	0.00026	357.0	6.0	378.0	5.2
8.1	336	2944	8.77	0.103	0.085	2.679	0.014	16.778	0.233	0.0550	0.0004	0.01881	0.00025	372.8	5.0	376.3	5.0
9.1	280	4534	16.19	−0.050	−0.023	4.777	0.022	13.898	0.194	0.0554	0.0005	0.02062	0.00025	448.1	6.0	412.7	4.9
Weighted mean age ± 95% c.l. (Ma)														361.7	6.1	375.4	5.0
n														8/9		8/9
MSWD													1.4		1.2
Constant Bay Charleston orthogneiss 90–428 (Ireland and Gibson, 1998)
2.1	231	2981	12.93	0.492	0.291	3.765	0.023	58.161	0.927	0.0527	0.0004	0.00552	0.00007	109.4	1.7	110.9	1.4
3.1	231	2717	11.77	0.348	0.228	3.401	0.022	54.733	0.816	0.0515	0.0005	0.00589	0.00007	116.3	1.7	118.5	1.4
4.1	1	9	13.61	0.544	0.300	4.037	0.026	60.279	0.919	0.0531	0.0006	0.00542	0.00006	105.5	1.6	108.9	1.3
6.1	54	1617	30.15	0.198	0.053	8.349	0.043	61.635	0.765	0.0499	0.0006	0.00515	0.00006	103.6	1.3	103.8	1.1
7.1	175	2796	15.98	0.477	0.230	4.624	0.027	59.797	0.891	0.0525	0.0010	0.00550	0.00007	106.4	1.6	110.5	1.5
8.1	202	2413	11.94	0.236	0.153	3.438	0.023	59.654	0.983	0.0503	0.0005	0.00544	0.00008	106.9	1.8	109.5	1.5
9.1	194	2710	14.00	0.412	0.229	4.000	0.038	61.212	1.108	0.0519	0.0006	0.00533	0.00007	104.0	1.9	107.2	1.5
10.1	211	2661	12.59	0.213	0.139	3.418	0.026	58.205	1.085	0.0502	0.0008	0.00544	0.00007	109.6	2.0	109.5	1.3
13.1	284	3972	13.98	2.340	1.202	4.337	0.075	42.627	1.090	0.0704	0.0038	0.00836	0.00017	146.0	3.7	166.3	3.4
15.1	265	3224	12.16	3.273	1.872	3.897	0.067	35.651	0.963	0.0795	0.0038	0.00947	0.00019	172.6	4.7	187.0	3.7
Weighted mean age ± 95% c.l. (Ma)														106.1	2.5	108.3	2.7
n														7/10		7/10
MSWD													2.0		3.9

Fig. 6  Map showing histograms of zircon (black) and monazite (grey) age structures for paragneisses (left) and orthogneisses (right). For all histograms, ²³⁸U/²⁰⁶Pb ages <800 Ma are corrected for common Pb based on ²⁰⁷Pb and all ²⁰⁷Pb/²⁰⁶Pb ages >800 Ma are corrected for common Pb based on ²⁰⁴Pb.

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