Geochemistry and Provenance Study of Quaternary Sediments from Eastern Himalaya

Kumar, Gagan (2015) Geochemistry and Provenance Study of Quaternary Sediments from Eastern Himalaya. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Gagan Kumar (09MS092)) MS_Thesis_Gagan_Kumar_09MS092.pdf - Submitted Version Restricted to Repository staff only Download (6MB)

Abstract

Sediments are an important source of information about previous orogenic conditions and its composition may describe the evolution of provenance and tectonic setting. Many factors influence sediment composition such as source rock composition, chemical weathering, climate, transport burial, and diagenesis. As the sediment composition changes through time, the geochemical characteristics of the sediment can be used to understand its geologic history. Eastern Himalaya has numerous mountain attached alluvial fans which are dissected by numerous new rivers originating from the mountain belt. They have often been affected and reshaped by neo-tectonic activity. Similarly many alluvial terraces has been developed by the down cutting of the rivers. Many of the Quaternary fan and terraces of the frontal Himalaya have mainly been attributed to the ongoing tectonic movements. However climate can also play major roles in the development of fans and terraces if we look at the multimillenial time scale. Although several studies based on the geomorphological signature have been done to understand the role of climate and tectonics in the formation and shaping of these alluvial landforms none has been done using geochemical methods in the region. Here my study aims to understand the process based on the geochemistry and optically stimulated luminescence (OSL) dating

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