New Zealand Journal of Geology and Geophysics abstracts

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New information on the age and thermal history of a probable Early Triassic siltstone near Kaka Point, South Island, New Zealand

R. K. PAULL

Department of Geosciences
P.O. Box 413
University of Wisconsin-Milwaukee
Milwaukee, WI 53201, U.S.A.

J. D. CAMPBELL
D. S. COOMBS

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

Abstract  The conodont Neospathodus homeri s.l. supports a late Early Triassic, Malakovian, age for an ammonoid-rich horizon in the Potiki Siltstone, 0.9 km south of Kaka Point, southeast Otago, rather than an alternative designation of Early to Middle Anisian. The conodont colour alteration index suggests a thermal history with temperature not exceeding c. 80deg.C. The Kaka Point structural belt appears to have had a tectonic and thermal history different from that of the adjacent Murihiku Terrane.

Keywords  conodont; Triassic; Malakovian; Etalian; low-grade metamorphism; Dun Mountain-Maitai Terrane; Murihiku Terrane

New Zealand Journal of Geology and Geophysics, 1996, Vol. 39: 581-584

0028-8306/96/3904-0581 $2.50/0 (c) The Royal Society of New Zealand 1996

PDF file of entire paper: medium quality (1158K); (scanned from paper original: notes about this process)

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