Coats Land dolerites and the generation of Antarctic continental flood basalts
- 1 January 1992
- journal article
- Published by Geological Society of London in Geological Society, London, Special Publications
- Vol. 68 (1), 185-208
- https://doi.org/10.1144/gsl.sp.1992.068.01.12
Abstract
On the basis of geochemical signatures, Mesozoic magmatism in Antarctica is divided into the Ferrar Magmatic Province and the Dronning Maud Land Province. The tholeiitic magmatism of the Ferrar Magmatic Province is distinguished by such features as low Ti/Y (< 200) and Zr/Y (< 5.0) ratios, negative εNd values (< −3) and relatively enriched initial 87Sr/86Sr ratios (> 0.709). All of these geochemical features indicate a major contribution from the continental mantle lithosphere in the generation of these magmas. In contrast, the Dronning Maud Land magmatism has elevated trace element ratios and εNd values (Ti/Y 250–600; Zr/Y 3.0–9.0; εNd −2 to +3) and lower initial 87Sr/86Sr ratios (< 0.707) relative to the Ferrar Magmatic Province. The trace element and isotopic correlations suggest that these magmas were derived by the mixing of an OIB like asthenospheric component with a continental lithosphere component. The transition between these two geochemical provinces is located in Coats Land.Keywords
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