The Chrystalls Beach‐Brighton block, southeast Otago, New Zealand: Petrography, geochemistry, and terrane correlation

D. S. Coombs Geology Department, University of Otago, P.O. Box 56, Dunedin, New Zealand

C. A. Landis Geology Department, University of Otago, P.O. Box 56, Dunedin, New Zealand

S. Hada Research Institute for Higher Education, Kobe University, Kobe, 657–8501, Japan

M. Ito Graduate School of Science and Technology, Kobe University, Kobe, 657–8501, Japan

B. P. Roser Department of Geoscience, Shimane University, 1060 Nishikawatsu, Matsue, 690–8504, Japan

T. Suzuki Department of Geology, Faculty of Science, Kochi University, Kochi, 780–8520, Japan

S. Yoshikura Department of Geology, Faculty of Science, Kochi University, Kochi, 780–8520, Japan

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Abstract

The Chrystalls Beach‐Brighton coastal block in southeast Otago has commonly has been placed in Caples Terrane, but has recently been described as a geochemically anomalous area of uncertain terrane affinity. Data points on discriminant diagrams occupy fields centred between those for type Caples Group and Torlesse Terrane, overlapping both. The psammites average 71.9% SiO₂, closely comparable to Torlesse Terrane psammites, in contrast to the majority of type Caples Group psammites (av. 64.3%) and Waipapa Terrane psammites (64.4%). QFL plots show the Chrystalls Beach psammites as a petrofacies distinct from those described hitherto for Torlesse Terrane (lithic feldsarenites) and Caples Group and Murihiku Terrane (volcarenites).

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The Chrystalls Beach‐Brighton block, southeast Otago, New Zealand: Petrography, geochemistry, and terrane correlation

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The Chrystalls Beach‐Brighton block, southeast Otago, New Zealand: Petrography, geochemistry, and terrane correlation

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