Geochemistry, petrography and rock magnetism of the basalts of Phek district, Nagaland

Geochemistry, petrography and rock magnetism of the basalts of Phek district, Nagaland

Basalts occur as sub-alkaline tholeiites in the Naga ophiolite belt. They bear an E-MORB affinity ascribed to aqueous fluid addition from a dehydrating oceanic crust in a supra-subduction zone during the Indo-Burma plate collision. They are commonly altered to spilite. They exhibit relatively poor R...

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Veröffentlicht in:Current science (Bangalore) 2015-06, Vol.108 (12), p.2240-2249
Hauptverfasser: Imchen, Watitemsu, Patil, S. K., Rino, V., Thong, Glenn T., Pongen, Temjenrenla, Rao, B. V.
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container_issue 12
container_start_page 2240
container_title Current science (Bangalore)
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creator Imchen, Watitemsu
Patil, S. K.
Rino, V.
Thong, Glenn T.
Pongen, Temjenrenla
Rao, B. V.
description Basalts occur as sub-alkaline tholeiites in the Naga ophiolite belt. They bear an E-MORB affinity ascribed to aqueous fluid addition from a dehydrating oceanic crust in a supra-subduction zone during the Indo-Burma plate collision. They are commonly altered to spilite. They exhibit relatively poor REE fractionation with almost flat chondrite-normalized patterns. Eu-anomalies are not prominent, indicating the negligible role of plagioclase fractionation in their petrogenesis. Rock magnetic studies suggest that magnetite is the major magnetic mineral in these Upper Cretaceous basalts.
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title Geochemistry, petrography and rock magnetism of the basalts of Phek district, Nagaland
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