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American Journal of Science, Vol. 303, September 2003, P.603-621; doi:10.2475/ajs.303.7.603

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A provisional structural thickness map of the Otago Schist, New Zealand

Nick Mortimer

Institute of Geological and Nuclear Sciences, Private Bag 1930, Dunedin, New Zealand

n.mortimer{at}gns.cri.nz

Metamorphic zones, terranes and lithologic associations provide a subdivision of the lithologically monotonous Otago Schist on a 10 to 50 kilometer scale. In this study, form line maps of schist foliation have been used to construct a provisional structural thickness map of the Otago Schist that allows a more detailed (1-5 km scale) subdivision of the entire schist. The map shows the macroscopic thickness of schist measured orthogonal to dominant foliation, relative to the datum of the Caples-Rakaia terrane boundary. The structural thickness map provides a new spatial reference frame for the Otago Schist that depicts the differing levels of exhumation of penetratively deformed metamorphic rocks. The structural thickness parameter shows a good correlation with metamorphic grade, white mica grain size, and K-Ar and Ar-Ar ages, thus justifying the simplifying assumptions behind the map’s construction. The map reveals several hitherto little-highlighted features including along- and across-strike correlations, interference patterns between Mesozoic and Cenozoic macroscopic folds, net displacement across known and inferred major faults, and relative structural position of mesothermal gold deposits.




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M.A. FORSTER and G.S. LISTER
Tectonic sequence diagrams and the structural evolution of schists and gneisses in multiply deformed terranes
Journal of the Geological Society, September 1, 2008; 165(5): 923 - 939.
[Abstract] [Full Text] [PDF]


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