New Zealand Journal of Geology and Geophysics abstracts

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Pahau Terrane type locality: fan delta in an accretionary prism trench-slope basin

Kari N. Bassett
Richard Orlowski

Department of Geological Sciences
University of Canterbury
Private Bag 4800
Christchurch, New Zealand
email: kari.bassett@canterbury.ac.nz

Abstract  The sediments of the Pahau Terrane, part of the Torlesse Superterrane, have never been adequately described or formally defined, although an unofficial type area in the Pahau River exists. This research formalises the type locality and interprets the sedimentology and tectonic setting of the deposits. Four well-defined lithofacies are able to be distinguished in the area: mudstone, interbedded mudstone-sandstone, sandstone, and conglomerate. We propose the Lochiel Formation to encompass these lithofacies and the Mt Saul Member for the conglomeratic bodies found within the Lochiel Formation. The Pahau River Group is to encompass the Lochiel Formation and future formations defined within the Cretaceous Torlesse Supergroup and is envisioned to extend over a large part of the Pahau Terrane.

Keywords  Pahau Terrane; Lochiel Formation; Mt Saul Member; conglomerate; fan delta; Torlesse Superterrane; accretionary prism; Mt Cropp Fault; new structural names; new stratigraphic names

G03052; Received 26 May 2003; accepted 30 March 2004; Online publication date 1 December 2004
New Zealand Journal of Geology & Geophysics, 2004, Vol. 47: 603–623
0028–8306/04/4704–0603© The Royal Society of New Zealand 2004

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