地质学报2023，Vol.97Issue(11)：3637-3650,14.DOI:10.19762/j.cnki.dizhixuebao.2023132
铬同位素体系及其在铬铁矿成矿过程中的应用
Chromium isotope systematics and its applications in chromite deposits
摘要
Abstract
In recent years,chromium(Cr)isotope systematics have been widely used in tracing geological processes related to mantle partial melting,magma differentiation,and subduction fluid-related processes.This study summarizes the main advances in using Cr isotope geochemistry in chromite deposits in mafic-ultramafic rocks,including:① Cr isotope compositions of chromite and coexisting silicates in the peridotite zone of the Stillwater complex and crust-mantle transition zone of the Kizildağ ophiolite reveal that Cr isotopes had been significantly fractionated during formation of both stratiform and stratiform-like chromitite,which was mainly controlled by fractional crystallization and magma replenishment;② Cr isotope compositions of the podiform chromitite from Kizildağ ophiolite suggested that spinel in the mantle peridotites in the subduction zone is one of the mainly Cr sources in podiform chromitite,and the subduction zone fluids may also directly participate in mineralized formation;③ diffusion-driven inter-mineral Cr isotope fractionation in ophiolite and layered intrusion can not only be used to estimate cooling time of magmas,but also reveal critical medium role of hydrous fluids in chemical exchange between minerals.关键词
蛇绿岩/层状岩体/铬铁矿/铬同位素/铬矿床Key words
ophiolite/layered intrusion/chromite/Cr isotopes/chromite deposit引用本文复制引用
白洋,苏本勋,肖燕,史仁灯,潘旗旗,袁庆晗,崔梦萌,王静..铬同位素体系及其在铬铁矿成矿过程中的应用[J].地质学报,2023,97(11):3637-3650,14.基金项目
本文为国家自然科学基金项目(编号41973012)、优秀博士毕业生来晋工作奖励(编号DC2100004358)和中国科学院青年创新促进会联合资助的成果. （编号41973012）
