Geochemistry of sandstones from the Imphal Valley, Indo-Myanmar Ranges

Salam Ranjeeta Devi

doi:10.51710/jias.v41iII.361

Authors

Salam Ranjeeta Devi Manipur University

DOI:

https://doi.org/10.51710/jias.v41iII.361

Keywords:

Spheroidal Weathering, Imphal Valley, Indo-Myanmar Ranges, paleoweathering and mineral alteration, paleoclimate

Abstract

Spheroidal weathered siliciclastic rocks of the Imphal Valley, Indo-Myanmar Ranges were studied to determine paleoclimate, paleoweathering and mineral alteration based on the geochemical and mineralogical compositions. The Chemical Index of Alteration (CIA) suggests low-intermediate chemical weathering. Plagioclase Index of Alteration (PIA) value indicates incipient plagioclase alteration. Mineralogical Index of Alteration (MIA) reveals incipient to intermediate mineralogical alteration and the A-CN-K ternary plot of the studied samples suggests a low rate of alteration. The results suggest semi-arid climate, which ranges from warm-arid to warm cool conditions. Geochemistry and mineralogy indicate felsic, mafic and ultramafic compositions for the siliciclastic rocks.

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