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Granitoids and dykes of the Pine Island Bay region, West Antarctica

Published online by Cambridge University Press:  14 May 2012

Andrea Kipf ,
Nicholas Mortimer ,
Reinhard Werner ,
Karsten Gohl ,
Paul Van Den Bogaard ,
Folkmar Hauff  and
Kaj Hoernle
Andrea Kipf
Affiliation:
Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR), Wischhofstr. 1–3, D-24148 Kiel, Germany
Nicholas Mortimer
Affiliation:
GNS Science, Private Bag 1930, Dunedin, New Zealand
Reinhard Werner*
Affiliation:
Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR), Wischhofstr. 1–3, D-24148 Kiel, Germany
Karsten Gohl
Affiliation:
Alfred Wegener Institut für Polar- und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany
Paul Van Den Bogaard
Affiliation:
Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR), Wischhofstr. 1–3, D-24148 Kiel, Germany
Folkmar Hauff
Affiliation:
Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR), Wischhofstr. 1–3, D-24148 Kiel, Germany
Kaj Hoernle
Affiliation:
Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR), Wischhofstr. 1–3, D-24148 Kiel, Germany
*
*Corresponding author: rwerner@geomar.de
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Abstract

We present geochronological and geochemical data for eight plutonic rocks from five locations in the Pine Island Bay area of West Antarctica, collected during RV Polarstern expedition ANT-XXIII/4. Ar-Ar laser method dating yielded closure temperatures ages of c. 147–98 Ma for dioritic and granitic plutonic rocks and an age range of c. 97–95 Ma for granitoid and trachyandesitic dykes. Major and trace element compositions indicate that all rocks have an I-type subduction-related chemistry. There are no A-type granitic rocks in our dataset, and none are yet reported from the Pine Island Bay area. Our results confirm earlier models of post 100 Ma subduction on this part of the Gondwana margin.

Keywords

40Ar/39Ar geochronologygeochemistryGondwanagranitestectonics
Type
Earth Sciences
Information
Antarctic Science , Volume 24 , Issue 5 , 13 September 2012 , pp. 473 - 484
Copyright
Copyright © Antarctic Science Ltd 2012

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