Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Rb-Sr Ages of Lamprophyre Dykes from Schirmacher Oasis, Queen Maud Land, East Antarctica


Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, India
     

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Lamprophyre dykes intrude the late Proterozoic metamorphic terrain of Schimucher Oasis, Queen Maud Land, East Antarctica. Rb-Sr whole-rock/mineral isochron ages of two lamprophyre dykes are 455 ± 12 Ma (Sr1 = 0.70886 ± 5) and 458 ± 6 Ma (Sr1 = 0.71388 ± 98). This lamprophyre dyke activity of Schirmacher Oasis, may be interprete4 as a manifestation of post orogenic alkaline magmatism related to the Ross orogeny of the Transantarctic mountains.

Keywords

Geochronology, Alkaline Igneous Activity, Lamprophyre, East Antarctica.
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  • Rb-Sr Ages of Lamprophyre Dykes from Schirmacher Oasis, Queen Maud Land, East Antarctica

Abstract Views: 170  |  PDF Views: 2

Authors

A. M. Dayal
National Geophysical Research Institute, Hyderabad - 500 007, India
S. M. Hussain
National Geophysical Research Institute, Hyderabad - 500 007, India

Abstract


Lamprophyre dykes intrude the late Proterozoic metamorphic terrain of Schimucher Oasis, Queen Maud Land, East Antarctica. Rb-Sr whole-rock/mineral isochron ages of two lamprophyre dykes are 455 ± 12 Ma (Sr1 = 0.70886 ± 5) and 458 ± 6 Ma (Sr1 = 0.71388 ± 98). This lamprophyre dyke activity of Schirmacher Oasis, may be interprete4 as a manifestation of post orogenic alkaline magmatism related to the Ross orogeny of the Transantarctic mountains.

Keywords


Geochronology, Alkaline Igneous Activity, Lamprophyre, East Antarctica.