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

Kipf, Andrea, Mortimer, Nicholas, Werner, Reinhard, Gohl, Karsten, van den Bogaard, Paul, Hauff, Folkmar and Hoernle, Kaj (2012) Granitoids and dykes of the Pine Island Bay region, West Antarctica Antarctic Science, 24 (5). pp. 473-484. DOI 10.1017/S0954102012000259.

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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.

Document Type: Article
Keywords: Polar Research; 40Ar/39Ar geochronology, geochemistry, Gondwana, granites, tectonics; R.V. Polarstern; ANT-XXIII
Research affiliation: AWI
Kiel University
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 10.1017/S0954102012000259
ISSN: 0954-1020
Projects: Future Ocean
Date Deposited: 05 Jun 2012 07:30
Last Modified: 26 Apr 2016 10:02

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