西昆仑造山带东端新C-2013-198航磁异常处含钴镍矿化超镁铁质岩的发现及其找矿意义  

Discovery of Cobalt-Bearing Nickel Mineralized Ultramafic Rocks at the Aeromagnetic Anomaly C-2013-198,Eastern End of the West Kunlun Orogenic Belt and its Significance for Prospecting

作　　者：罗志波 王身龙 刘桂梅 杨学明 曹朋军 林星 张翰奇 王倩 LUO Zhibo;WANG Shenlong;LIU Guimei;YANG Xueming;CAO Pengjun;LIN Xing;ZHANG Hanqi;WANG Qian(Tianjin Geophysical Exploration Center,Tianjin 300170;Tianjin North China Geological Exploration General Institute,Tianjin 300170)

机构地区：[1]天津市地球物理勘探中心,天津300170 [2]天津华北地质勘查总院,天津300170

出　　处：《地质与勘探》2020年第3期512-522,共11页Geology and Exploration

基　　金：中国地质调查局“新疆和田东三县1∶5万航磁调查”(编号:12120113072800);中国国土资源航空物探遥感中心“新疆和田东三县1∶5万航磁异常查证”(编号:12120114085701);天津华北地质勘查局科技创新项目(B类)(编号:HK2019-B5)联合资助。

摘　　要：新C-2013-198号航磁异常位于西昆仑造山带东端黄羊滩地区,苏巴什构造结合带南侧。三级查证工作表明,该异常对应地质体为含钴镍矿化超镁铁质岩,由辉橄岩和辉石岩组成。其中辉橄岩Ni含量分布在0.15%~0.32%,Co 0.012%~0.016%,Ni平均品位0.21%,Co 0.014%;辉石岩Ni含量为0.10%~0.19%,Co 0.007%~0.010%,Ni平均品位0.14%,Co 0.008%。含钴镍矿化仅赋存于超镁铁质岩石中,具明显岩浆控矿特征。赋矿超镁铁质岩与伴生辉长岩、斜长花岗岩构成蛇绿岩岩石组合,为西昆仑造山带苏巴什蛇绿岩的一部分。综合分析认为,含钴镍矿化成矿类型为与蛇绿岩有关的岩浆硫化物矿床,具煎茶岭式镍矿成矿特征。推断新疆南部西昆仑地区具有寻找煎茶岭式镍矿的找矿前景。The aeromagnetic anomaly C-2013-198 is located in the Huangyangtan area,southern side of the Subashi tectonic junction zone,eastern end of the West Kunlun orogenic belt.The third-order verification indicates that the anomaly corresponds to a set of cobalt-bearing nickel mineralized ultramafic rocks,including pyroxene peridotite and pyroxenite. The Ni content of pyroxene peridotite ranges from 0. 15% to 0. 32% with an average value of0.21%,and the Co content ranges from 0.012% to 0.016% with an average value of 0.014%.The Ni content of pyroxenite ranges from 0.10% to 0.19%,and the Co content ranges from 0.007% to 0.010%.The cobalt-bearing nickel mineralization is hosted only in ultramafic rocks with an obvious magmatic ore-controlling feature.The ore-hosting ultramafic rocks,associated with gabbro and plagioclase granite,belong to Subashi ophiolite in the West Kunlun orogenic belt.Comprehensive analysis suggests that the cobalt-bearing nickel mineralization belongs to magmatic sulfide type related with ophiolite,and can be analogized with the Jianchaling nickel deposit.It is speculated that the West Kunlun area in southern Xinjiang has a great prospecting potential for finding Jianchaling-like nickel deposits.

关 键 词：航磁异常查证 苏巴什蛇绿岩 煎茶岭镍矿 找矿前景 西昆仑造山带 

分 类 号：P611.11[天文地球—矿床学]