矿床地质2012，Vol.31Issue(6)：1195-1210,16.
新疆东天山土墩铜镍硫化物矿床岩石地球化学和铂族元素特征及其对成矿的指示意义
Rock geochemistry and platinum group elements characteristics of Tudun Cu-Ni sulfide deposit in East Tianshan Mountains of Xinjiang and their metallogenic implications
摘要
Abstract
In this paper, the origin, the evolutionary process of metallogenic magma, the segregation of sulfides and the ore-forming process were studied. Based on geochemical characteristics of different rocks in the Tudun Cu-Ni deposit, the authors infer that the magma belonged to tholeiitic magma series, fractional crystallization occurred in magma chamber and/or during the emplacement process, and there might have occurred assimilation and hy-bridization during the evolution of the ascending magma. In addition, the authors studied geochemistry of platinum group elements in rocks and ores of the Tudun Cu-Ni deposit and wrote the first report. The total concentrations of PGE in rock and ore samples are low. Rock and ore samples have similar mantle-normalized PGE distribution patterns, suggesting the Pt-Pd type. The diagram of Ni/Cu against Pd/Ir and geochemistry of rocks reveal that the primary magma of Tudun was basaltic magma with high MgO content, without depletion of platinum group elements. The relatively high Cu/Pd ratios imply that partial segregation of sulfides occurred in the initial magmatic evolution process, resulting in the depletion of parental magma in PGE. According to the relationship between Cr, PGE and Ni, the fractionation of chromite was likely the main factor leading to sulfide segregation. The diagram of Ti/Y against Zr/Y and the regional geological revolution show that Tudun ore-bearing mafic-ultramafic rocks occurred in an erosion environment after collision.关键词
地球化学/铂族元素/岩石地球化学/成矿作用/土墩铜镍硫化物矿床/东天山Key words
geochemistry/ platinum group element/ rock geochemistry/ metallogenesis/ Tudun Cu-Ni sulfide deposit/ East Tianshan Mountain分类
天文与地球科学引用本文复制引用
王敏芳,夏庆霖,肖凡,汪新庆,杨武胜,姜楚灵..新疆东天山土墩铜镍硫化物矿床岩石地球化学和铂族元素特征及其对成矿的指示意义[J].矿床地质,2012,31(6):1195-1210,16.基金项目
本文得到中国地质调查局计划项目(编号:1212011085466)、国家自然科学基金面上项目(编号:41272097)、国家自然科学基金青年科学基金(编号:40902026)、地质过程与矿产资源国家重点实验室开放课题(编号:GPMR201006)和中央高校基本科研业务费专项资金(编号:CUG120702)的联合资助 （编号:1212011085466）
