Journal article

French creek granite and hohonu dyke swarm, south island, new zealand: Late cretaceous alkaline magmatism and the opening of the tasman sea*

TE Waight, SD Weaver, R Maas, GN Eby

Australian Journal of Earth Sciences | Published : 1998

Abstract

The Hohonu Dyke Swarm and French Creek Granite represent contemporaneous and cogenetic alkaline magmatism generated during crustal extension in the Western Province of New Zealand. The age of 82 Ma for French Creek Granite coincides with the oldest oceanic crust in the Tasman Sea and suggests emplacement during the separation of New Zealand and Australia. The French Creek Granite is a composite A-type granitoid, dominated by a subsolvus biotite syenogranite with high silica, low CaO, MgO, Cr, Ni, V and Sr and elevated high-field-strength elements (Zr, Nb, Ga, Y). Subordinate varieties of French Creek Granite include a hypersolvus alkali amphibole monzogranite and a quartz-alkali feldspar sye..

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