东昆仑夏日哈木矿区岩体含矿性特点与形成机理探讨  

Mineralization Characteristics and Formation Mechanism of the Intrusions in Xiarihamu Magmatic Ni-Cu Sulfide Deposit,East Kunlun Orogenic Belt,Northwest China

作　　者：张照伟 王驰源 刘超 王亚磊 钱兵 李文渊 尤敏鑫 张江伟 ZHANG Zhaowei;WANG Chiyuan;LIU Chao;WANG Yalei;QIAN Bing;LI Wenyuan;YOU Minxin;ZHANG Jiangwei(Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MNR, Xi an Center of China Geological Survey/ Northwest China Center for Geoscience Innovation, Xi an 710054, Shaanxi, China;Department of Natural Resources of Xinjiang Uygur Autonomous Region, Urumqi 830002, Xinjiang, China;School of Earth Sciences,Chengdu University of Technology, Chengdu 610059, Sichuan, China;School of Earth Science and Resources, Chang an University, Xi an 710054, Shaanxi, China)

机构地区：[1]中国地质调查局西安地质调查中心/西北地质科技创新中心,自然资源部岩浆作用成矿与找矿重点实验室,陕西西安710054 [2]新疆维吾尔自治区自然资源厅,新疆乌鲁木齐830002 [3]成都理工大学地球科学学院,四川成都610059 [4]长安大学地球科学与资源学院,陕西西安710054

出　　处：《西北地质》2019年第3期35-45,共11页Northwestern Geology

基　　金：国土资源公益性行业科研专项“拉陵灶火镍成矿赋矿机理及勘查技术研究示范”(201511020);国家自然科学基金项目“东昆仑夏日哈木铜镍矿床硫化物不混溶作用研究”(41873053);中国地质调查局地质调查项目“西昆仑大红柳滩-甜水海地区大型矿产资源基地综合调查”(DD20190143);第二次青藏高原综合科学考察研究专题(2019QZKK0802-5、2019QZKK0807-2)资助成果

摘　　要：东昆仑造山带有众多基性超基性岩体,但目前仅在夏日哈木Ⅰ号岩体发现有超大型镍矿。对其含矿性特点与形成机理的研究有助于东昆仑地区的铜镍矿勘查。笔者梳理了目前诸多学者对夏日哈木铜镍矿的研究工作,并结合野外实际,发现铁质系列的镁铁超镁铁质岩体才可能形成有经济价值的岩浆铜镍矿体,镁质系列的镁铁超镁铁质岩体不可能成就大规模岩浆铜镍硫化物矿体;大断裂为地幔岩浆上侵提供了有利条件;分异良好的超基性岩体更具有成铜镍矿的潜力;结晶分异促进了硫化物饱和,地壳硫混染是成矿的关键;橄榄石和单斜辉石具有低的CaO和FeO含量的岩体特征,更有利于成铜镍矿。Some mafic-ultramafic intrusions have been found in the East Kunlun Orogenic Belt, but only the Xiarihamu I intrusions produces the giant Ni deposit. The study on ore-bearing characteristics and formation mechanism of the Xiarihamu I intrusion contributes to the exploration of copper-nickel deposits in the east Kunlun area. The research work of many scholars on the Xiarihamu nickel ore deposit has been summarized in this paper. Based on the field investigation, it s found that the iron series mafic-ultramafic intrusions can form the magmatic copper-nickel ore body with economic value, but magnesia series mafic-ultramafic intrusions are unlikely to achieve copper-nickel sulfide ore bodies. Large faults provide favorable conditions for the intrusion of mantle magma. The well-differentiated mafic-ultramafic intrusions have the better potential to form a copper-nickel ore. Crystallization differentiation promotes sulfide saturation, and the crustal sulfur contamination is the key to mineralization. The intrusions with olivine and clinopyroxene have low CaO and FeO content, which is more conducive to copper-nickel ore.

关 键 词：镁铁超镁铁质岩体 铜镍矿 含矿特点 成矿机理 夏日哈木 

分 类 号：P588.1[天文地球—岩石学]