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Boron- and phosphate-rich rocks in the Larsemann Hills, Prydz Bay, East Antarctica: tectonic implications

By
Edward S. Grew
Edward S. Grew
1
School of Earth and Climate Sciences, University of Maine, 5790 Bryand Global Science Center, Orono, ME 04469, USA
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Christopher J. Carson
Christopher J. Carson
2
Geoscience Australia, PO Box 378, Canberra, ACT 2601, Australia
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Andrew G. Christy
Andrew G. Christy
3
Centre for Advanced Microscopy, Australian National University, Canberra, ACT 0200, Australia
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Steven D. Boger
Steven D. Boger
4
School of Earth Sciences, University of Melbourne, Parkville, VIC 3010, Australia
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Published:
January 01, 2013

Abstract

Granulite-facies paragneisses enriched in boron and phosphorus are exposed over c. 15×5 km2 in the Larsemann Hills, Antarctica. The most widespread are biotite gneisses containing centimetre-sized prismatine crystals, but tourmaline metaquartzite and borosilicate gneisses are richest in B (676–19 700 µg/g or 0.22–6.34 wt%; B2O3). Chondrite-normalized rare-earth element (REE) patterns give two groups: (1) LaN>150, Eu*/Eu<0.4, which comprises most apatite-bearing metaquartzite and metapelite, tourmaline metaquartzite, and Fe-rich rocks (up to 2.3 wt%; P2O5); (2) LaN<150, Eu*/Eu > 0.4, which comprises most borosilicate and sodic leucogneisses (2.5–7.4wt%; Na2O). Enrichment in boron and phosphorus is attributed to premetamorphic hydrothermal alteration, either in a rifted, most likely marine basin or in a mud volcanic system located inboard of a c. 1000 Ma continental arc that was active along the leading edge of the Indo-Antarctic craton. This margin developed before collision with the Australo-Antarctic craton (c. 530 Ma) merged these rocks into Gondwana and sutured them into their present position in Antarctica. Rocks lithologically similar to those in the Larsemann Hills include prismatine-bearing granulites in the Windmill Islands, Wilkes Land, and tourmaline–quartz rocks, sodic gneisses and apatitic iron formation in the Willyama Supergroup, Broken Hill, Australia.

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Geological Society, London, Special Publications

Antarctica and Supercontinent Evolution

S. L. Harley
S. L. Harley
University of Edinburgh, UK
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I. C. W. Fitzsimons
I. C. W. Fitzsimons
Curtin University of Technology, Australia
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Y. Zhao
Y. Zhao
CAGS, China
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Geological Society of London
Volume
383
ISBN electronic:
9781862396470
Publication date:
January 01, 2013

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