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The age, petrogenesis and emplacement of the Dalmatian Granite, H.U. Sverdrupfjella, Dronning Maud Land, Antarctica

Published online by Cambridge University Press:  13 May 2004

G.H. Grantham ,
A.B. Moyes  and
D.R. Hunter
G.H. Grantham
Affiliation:
Department of Geology, University of Pretoria, Hillcrest, Pretoria, 0002, South Africa
A.B. Moyes
Affiliation:
Bernard Price Institute, University of the Witwatersrand, P.O. Wits, Johannesburg, 2050, South Africa
D.R. Hunter
Affiliation:
Department of Geology, University of Natal, P.O. Box 375, Pietermaritzburg, 3200, South Africa
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Abstract

The ∼470 Ma Dalmatian Granite forms sheet-like bodies intruded discordantly into orthogneisses, paragneisses and calcareous rocks belonging to the ∼1000 Ma Jutulrora, Sveabreen and Fuglefjellet formations respectively. The Dalmatian Granite is muscovite + biotite bearing. Two varieties are recognized, one that is magnetite-bearing and another that is characterized by tourmaline nodules. At some localities, development of the tourmaline-bearing variety is spatially associated with the presence of carbonates. Physical conditions of emplacement for the Dalmatian Granite are estimated to be approximately 700°C and 6kbar with pH2O = Pload. The emplacement of the granite is considered to have occurred syntectonically during D3 approximately 470 Ma ago. The granites are therefore similar in age to Pan African age granites in Mozambique as well as Ross Orogeny age granites in the Transantarctic Mountains.

Keywords

granitesyn-tectonicPan AfricanRoss Orogeny
Type
Papers–Earth Sciences and Glaciology
Information
Antarctic Science , Volume 3 , Issue 2 , June 1991 , pp. 197 - 204
Copyright
© Antarctic Science Ltd 1991

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