地质通报2024，Vol.43Issue(9)：1595-1606,12.DOI:10.12097/gbc.2022.10.040
新疆东准噶尔石炭纪坝西铜矿斑岩成因及对找矿的启示
Petrogenesis of porphyries in Baxi copper deposit in East Junggar,NW China and its enlightenment to mineral prospecting
摘要
Abstract
The recently discovered Baxi porphyry copper deposit is located in the Qiongheba ore-concentration area in East Junggar,Xinjiang.The ore-bearing porphyry are mainly composed of quartz diorite,quartz monzodiorite and granodiorite.Zircon U-Pb dating yielded two similar late Early Carboniferous ages of 337 Ma for quartz diorite and granodiorite.Quartz diorites and granodiorites are high SiO2,CaO,Al2O3,and low K2O contents,belonging the calc-alkaline,aluminum-weakly peraluminous.They are rich in LREE and LILE,such as Nb,Ta and Ti with weak negative Eu anomaly and high Sr and low Y contents,showing arc granitic characters with some Adakite futures.Combined with the regional research,we suggest the diorites and granodiorites in the Baxi porphyry copper deposit formed by partial melting of former subduction arc with magmatic mixing and following crystallization differentiation during the tectonic transition period from subduction to post-orogenic setting in Late Paleozoic.Porphyry copper deposits also formed in this period.In other words,except the Silurian-Devonian large-scale metallogenic stage,Carboniferous is also an important metallogenic stage in the Qiongheba area.It indicates that we should more attention on Late Paleozoic post-collision porphyry deposits in mineral exploration in northern Xinjiang and adjacent areas.关键词
琼河坝/石炭纪/斑岩铜矿/构造体制转换/东准噶尔Key words
Qiongheba/Carboniferous/porphyry copper deposit/tectonic setting transition/East Junggar分类
天文与地球科学引用本文复制引用
孟秋熠,童英,薛春纪,赵云,王斯林,刘一浩,罗森森,李嘉宝..新疆东准噶尔石炭纪坝西铜矿斑岩成因及对找矿的启示[J].地质通报,2024,43(9):1595-1606,12.基金项目
国家重点研发计划《成矿系统构造-岩浆-成矿作用研究集成》(批准号:2018YFC0603702) （批准号:2018YFC0603702）
