Partial melting of mantle peridotite at plate boundaries: A theoretical model based on element mobility

Khan, Siddharth (2021) Partial melting of mantle peridotite at plate boundaries: A theoretical model based on element mobility. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS Dissertation of Siddharth Khan (16MS162)) 16MS162_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (4MB)

Abstract

This study is dedicated to modeling partial melting processes in the upper mantle as a byproduct of tectonic activities on the Earth’s surface. We present a rigorous quantification of major elements to define the degree of melting and trace elements as chemical indicators during Isentropic Adiabatic Decompression (IAD) melting at divergent boundaries and Flux induced melting at convergent boundaries. We have also modeled isobaric intra-plate magmatism due to hydrous activity as a part of the grand mantle-melting scheme. We aim to provide a generalised 1-D mantle column forward model of primary melt generation, formalised on the concept of thermodynamic equilibrium. We have used AlphaMELTS 1.9 for our simulations where we start from a known source composition, hypothesize the thermodynamic conditions-path and the bulk composition, to visualize the mantle melting trends as a function of important intensive and extensive parameters. We differentiate the modeled mantle activities based on the trace element activities in the final melt phase in terms of spider and REE plots and correlate with natural results at the same time.

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