The stratigraphic and structural setting of metamorphic continental units from Alpine Corsica: clues from the area between Asco and Golo valleys (Central Corsica, France)

Figures & data

Figure 1. (a) Tectonic sketch of the central Corsica with the location of the studied area. In the figure, the Hercynian Corsica (HC) is represented in lilac. Within the AC, the Lower Units (TU: Tenda Unit; CU: Caporalino Unit; PU: Pedani Units; FPU: Fuata-Pedanu Unit; PMU: Palasca-Multifao Unit; PPU: Piedigriggio-Prato Unit; CAU: Croce d’Arbitro Unit; CPU: Castiglione-Popolasca Unit), the Schistes Lustrés Complex (SL), the Upper Units (Ba: Balagne Units; Bo: Bas-Ostriconi Unit; Pi: Pineto Unit; SLN: Santa Lucia Nappe) are distinguished. Fb: Francardo Basin; (b) Schematic cross-section of the Central Corsica (modified after Di Rosa et al., 2019a).

Figure 2. Tectonic sketch of the area and related cross-section. The black box indicates the area of Figure 3.

Figure 3. Detail of the geological setting and related cross-section of the Popolasca-Castiglione area. The CPU structural data are plotted in the stereographic projections (Schmidt net, lower hemisphere).

Figure 4. View of the contact between the HC and AC along the Golo Valley. The contact is represented by a deformed, steep surface that upward becomes overturned. Legend: y1b: Pink granites (U3 suite); y3b: monzogranites (U2 suite); RB: Roches Brune Fm.; MV: Metavolcanites and Metavolcaniclastites Fm.

Figure 5. Lithology from LU: (a) Metagranites (CAU); (b) metavolcaniclastic deposits from Metavolcanites and Metavolcaniclastites Fm. (CPU); (c) detritic metalimestone from Detritic Metalimestones Fm. (PPU); (d) metasandstone from Metasandstones Fm. (CPU).

Figure 6. Micro-scale deformations in LU: (a) S1lu/S2lu relationships in metarenite from Metasandstones Fm. (CPU); (b) S2lu foliation in metarhyolite from Metavolcanites and Metavolcaniclastites Fm. (CAU); (c) D2lu phase shear zone in Metagranites (CPU); (d) S2lu/S3lu relationships in metarhyolite from Metavolcanites and Metavolcaniclastites Fm. (PPU).

Figure 7. Meso-scale deformations in LU: (a) F2lu fold in metalimestone from Metalimestones and Metadolomites Fm. (PPU); (b) S2lu foliation deformed by F3lu folds in Metagranites (CPU); (c) F3lu folds in Metabreccia Fm. (PPU); (d) relationships between S2lu and S3lu foliations in metarhyolite from Metavolcanites and Metavolcaniclastites Fm. (CAU).

Figure 8. Summary of the pressure-temperature-deformation (P/T-d) paths of the LU in the Central Corsica. P/T-d paths of CPU and PPU are after Di Rosa et al. (2017b) and P/T-d path of CAU after Malasoma et al. (2006). The stacking of the LU occurred during the late D2_lu phase.

Di Rosa, M. , Frassi, C. , Meneghini, F. , Marroni, M. , Pandolfi, L. , & De Giorgi, A. (2019a). Tectono-metamorphic evolution of the European continental margin involved in the Alpine subduction: New insights from the Alpine Corsica, France. Comptes Rendus Geoscience , 351 (5), 384–394. doi: 10.1016/j.crte.2018.12.002

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Di Rosa, M. , De Giorgi, A. , Marroni, M. , & Pandolfi, L. (2017b). Geology of the area between Golo and Tavignano valleys (Central Corsica): a snapshot of the continental metamorphic units of Alpine Corsica. Journal of Maps , 13 (2), 644–653. doi: 10.1080/17445647.2017.1351900

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Malasoma, M. , Marroni, M. , Musumeci, G. , & Pandolfi, L. (2006). High-pressure mineral assemblage in granitic rocks from continental units, Alpine Corsica, France. Geological Journal , 41 (1), 49–59. doi: 10.1002/gj.1032

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