Geochronological studies of Mesozoic igneous rocks from eastern India

A. Sarkar , A.K. Datta , B.C. Poddar , B.K. Bhattacharyya , V.K. Kollapuri , R. Sanwal
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引用次数: 82

Abstract

A wide variety of Mesozoic basaltic and alkaline igneous rocks crop out on the eastern margin of the Indian shield. We present new KAr isotopic age data on whole rock samples and mineral separates from several igneous rock suites from the Meghalaya-Nagaland region of northeast India. The KAr isotopic ages of these samples lie between 149-107 Ma, i.e., Late Jurassic to Early Cretaceous. Published data on the tectonic setting and petrology of the basaltic and alkaline rocks suggest that their emplacement was controlled by major fault systems. Active mantle upwelling in an extensional tectonic régime related to the fragmentation of the indian plate from Australia-Antarctica in the Early Cretaceous, appears to have been the main trigger for the magmatic activity.

印度东部中生代火成岩的地质年代研究
印度地盾的东部边缘出现了各种各样的中生代玄武岩和碱性火成岩。我们推出新K来自印度东北部Meghalaya-Nagaland地区的几个火成岩套房的全岩样本和矿物分离的Ar同位素年龄数据。K这些样品的Ar同位素年龄介于149-107Ma之间,即晚侏罗世至早白垩世。已发表的玄武岩和碱性岩石的构造背景和岩石学数据表明,它们的侵位受主要断裂系统的控制。早白垩世,与澳大利亚-南极洲印度板块破碎有关的伸展构造体系中的活跃地幔上升流似乎是岩浆活动的主要诱因。
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