Petrogenesis of the Neoarchean zincian chromite within ultramafic xenoliths,Bastar Craton,India

作     者：Arpita Karmakar Tushar Meshram Mohammad Asif Yogesh Pandey Arpita Karmakar;Tushar Meshram;Mohammad Asif;Yogesh Pandey

作者机构：Geological Survey of IndiaVasudha BhawanKumarswamy LayoutBangalore 560111India Geological Survey of IndiaNagpurIndia Geological Survey of IndiaRaipurIndia 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2023年第42卷第3期

页      面：471-487页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：Geological Survey of India Ministry of Mines Government of India for funding the opportunity to work in this projects 

主　　题：Zincian chromite Ultramafic Neoarchaean granitic magmatism High-grade metamorphism 

摘      要：The present study reports and discusses the genesis of zincian chromite in the ultramafic xenoliths from the Dongripali area,Bastar craton,Central *** zincian chromite is in the ultramafic xenoliths of Bengpal supracrustal rock hosted by Neoarchaean Bundeli *** zincian chromite shows a range of Cr_(2)O_(3)(39.69 to 51.66 wt%),Al_(2)O_(3)(05.30 wt%to 08.71 wt%),FeO(21.74 wt%to 27.51 wt%),Fe_(2)O_(3)(10.19 wt%to 19.36wt%)with higher ZnO content ranging from 1.73 wt%to 4.08 wt%.Accordingly,their Cr#[Cr/(Cr+Al)]varies in a narrow range from 0.83 to *** calculated melt composition supports metamorphic or post-magmatic nature rather than common occurrences such as inclusion in diamonds,meteorites,and association with any sulfide-rich mineralised *** reveals that the post-magmatic processes play a vital role in transforming chromite to zincian *** empirical thermometric calculation from chromite,amphibole,and pyroxene support their metamorphic origin and formed during low-P and high-T amphibolite grade facies of metamorphism(~700℃).The Neoarchaean granitic magmatism has a significant role in generating and transferring the heat during contact metamorphism with hydration of ultramafic xenoliths and further alteration,i.e.,*** olivine is a major repository for Mn,Zn,and Co in peridotite/ultramafic;these elements get mobilised during the metamorphism and *** is a possible reason for the mobilisation of zinc and incorporation in the chromite within altered *** a result,chromiterich ultramafic xenolith subjected to metamorphic process gets enrichment of Zn and Fe due to elemental *** converts common chromite into zincian chromite,as reported in altered ultramafics elsewhere.