1887

Abstract

Summary

Geophysical understanding of the anorthosite formations is very important to know not only the sub-surface infrastructure of the complexes but also the evolutionary history of the Planet Earth. Though the geological and geochemical studies are many, the geophysical studies are limited on anorthosites. In the Eastern Ghats Belt, India, the anorthosite massifs are exposed along with clinopyroxenite and the ferrosyenites in the Chimakurti Anorthosite-Gabbro (CAG) complex and are believed to be derived from tholeiitic parental magma during Mesoproterozoic times. The exposures of alkaline magma-derived nepheline syenites adjacent to this anorthosite suite of rocks are another interesting feature. This paper presents the review of gravity and magnetic studies on anorthosite rocks in the world and detailed gravity and magnetic characterization of anorthosite massif rocks of CAG complex. The gravity studies on different anorthosite complexes show contrasting models with presence or absence of mafic body. Therefore to find subsurface information detailed gravity and magnetic studies carried out in CAG complex. This geophysical study proved that there are no mafic bodies present beneath the nepheline syenites adjacent to these anorhosite formations. The study shows that the anorthosites in CAG complex India are associated with thick mafic bodies produced during in situ magma differentiation.

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2019-09-08
2024-03-28
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