New Zealand Journal of Geology and Geophysics abstracts

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Geology, geochemistry, and geochronology of an A-type granite in the Mulock Glacier area, southern Victoria Land, Antarctica

John M. Cottle
Alan F. Cooper^*

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

^*Corresponding author: alan.cooper@stonebow.otago.ac.nz

Abstract  On the north side of the Mulock Glacier and at Cape Teall in southern Victoria Land, Antarctica, deformed greenschist facies Skelton Group metasediments are intruded by the post-kinematic A-type Mulock Granite. Geochemical data indicate that this intrusive complex is similar to A-type granitoids previously described both to the north (Glee Intrusives and Penny Hill Granite), where they form part of the Koettlitz Glacier Alkaline Province, and to the south (Foggydog Granite Suite). A U-Pb zircon date of 546 ± 3 Ma on the Mulock Granite places a minimum constraint on the age, and timing of deformation of the Skelton Group rocks in this area, and indicates that the Mulock Granite was emplaced during the initial stages of the Ross Orogeny. This age also confirms that crystallisation of this granite body was synchronous with that of A-type granitoids from the Royal Society Range to Skelton Glacier area immediately to the north.

Keywords  A-type granite; Mulock; Koettlitz Glacier Alkaline Province; Skelton Group; Ross Orogeny; Antarctica

G05049; Received 30 September 2005; accepted 1 February 2006; Online publication date 12 May 2006
New Zealand Journal of Geology & Geophysics, 2006, Vol. 49: 191–202
0028–8306/06/4902–0191  © The Royal Society of New Zealand 2006

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