新疆阿尔泰巴特巴克布拉克铁矿床硫同位素和稀土元素地球化学特征及其意义  

A study of S isotope and REE geochemistry of Batebakebulake iron deposit in Altay, Xinjiang, and their geological significance

作　　者：杨俊杰 张志欣[2] 杨富全[3] 柴凤梅[4] YANG JunJie;ZHANG ZhiXin;YANG FuQuan;CHAI FengMei(School of Earth Science and Resources,Chang'an University,Xi'an 710054,Shaanxi,China;Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China;Key Laboratory of Metallogeny and Mineral Assessment,Ministry of Natural Resources,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt,Xinjiang University,Urumqi 830046,Xinjiang,China)

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆乌鲁木齐830011 [3]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [4]新疆大学新疆中亚造山带大陆动力学与成矿预测实验室,新疆乌鲁木齐830046

出　　处：《矿床地质》2020年第1期63-79,共17页Mineral Deposits

基　　金：国家重点研发计划（编号：2017YFC0601201）;国土资源部公益性行业科研专项经费项目（编号：201211073）共同资助

摘　　要：新疆阿尔泰巴特巴克布拉克铁矿床赋存于上志留统下泥盆统康布铁堡组变质火山-沉积岩的矽卡岩中,矿体形态复杂,呈似层状、透镜状及不规则状分布。围岩斜长角闪岩、变粒岩和浅粒岩稀土元素配分模式为轻稀土元素相对富集的右倾型,与矿区英云闪长岩稀土元素配分模式相似;矿石和矽卡岩稀土元素配分模式多表现为重稀土元素相对富集的左倾型,综合了围岩和英云闪长岩二者的特征,表明它们之间有明显的成因联系。结合硫同位素特征(1.4‰~4.8‰)表明,成矿物质来源于基性火山岩(围岩)。矽卡岩为花岗质岩浆期后热液交代火山岩的产物,铁矿化是矽卡岩退化蚀变的产物,矿床形成于弱还原-氧化环境。The Batebakebulake iron deposit in the Altay Orogenic Belt of Xinjiang is hosted in the metamorphosed volcano-sedimentary sequence of the Upper Silurian-Lower Devonian Kangbutiebao Formation.Orebodies occur as stratoid,lenticular and irregular forms,and their distribution is spatially associated with skarns.The REE geochemical characteristics show that the wall rocks(amphibolite,leptynite,leucoleptite)in the ore district have similar chondrite-normalized REE patterns which show enrichment of LREE,similar to those of the tonalite,suggesting that wall rocks have a clear genetic link with the tonalite.In addition,most of the ores and skarns have similar chondrite-normalized REE patterns which show enrichment of HREE.The δ34S values of sulfides range from 1.4‰to 4.8‰,with an average of 3.57‰.The S isotopic data,together with REE geochemical characteristics,indicate that the metallogenic material was derived from the basic volcanic rocks.The skarn probably resulted from the interaction of post-magmatic hydrothermal fluids with volcanic rocks,and the formation of magnetite was associated with the retrogressive metamorphism of the skarn.The deposit was formed in a weak reducingoxidizing environment.

关 键 词：地球化学 铁矿床 矽卡岩 硫同位素 稀土元素 巴特巴克布拉克 阿尔泰 

分 类 号：P618.31[天文地球—矿床学]