The geochemistry of Jurassic dolerites from Portal Peak,Antarctica |
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| Authors: | Janet M Hergt Bruce W Chappell Gunter Faure Teresa M Mensing |
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| Institution: | (1) Research School of Earth Sciences, The Australian National University, GPO Box 4, 2601 Canberra, ACT, Australia;(2) Department of Geology, The Australian National University, GPO Box 4, 2601 Canberra, ACT, Australia;(3) Department of Geology, The Ohio State University, 43210 Columbus, Ohio, USA |
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| Abstract: | Geochemical and isotopic analyses have been performed on a suite of samples from a Jurassic quartz tholeiite sill of the Ferrar Group at Portal Peak, Queen Alexandra Range, near the Beardmore Glacier in Antarctica. The data include major and trace element (XRF and INAA) concentrations, as well as Sr and Nd isotopic compositions, and are combined with the results of other studies on samples from Antarctica. It is demonstrated that despite differences in the pre-intrusion (or eruption) evolution of the Ferrar Group magmas, the similarity in isotopic and chemical compositions for these rocks supports the existence of a remarkably uniform mantle source with unusual signature over a distance of thousands of kilometres. The favoured origin of this source involves the subduction of terrestrial sedimentary material into a depleted mantle reservoir. |
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