摘要
通过对喀喇昆仑岔路口地区不同尺度地球化学数据的分析研究,发现Cr,Ni,Co等幔源元素异常富集,随着工作精度的提高,幔源元素含量显著增加,富集区形态更加清晰,由此推断区内普遍存在超基性岩或高Cr,Ni玄武岩。经野外查证,在团结峰东南发现众多超基性岩。主要岩性有橄榄岩、辉橄岩、玻基橄榄岩、玻基辉橄岩等,与之相关的火山岩有枕状玄武岩、块状玄武岩及火山碎屑岩。据野外产状和岩石地球化学特征,结合宏观、微观尺度鬣刺结构的存在,初步认定属科马提岩。除常规镍黄铁矿、紫硫镍矿、针镍矿和黄铜矿、磁黄铁矿、钛铁矿等外,在科马提岩中还发育有以细小“硫化物碎屑”存在的、铜镍共存的硫化物和高镁钛铁矿,这种情况极为罕见。
Based on the analysis of different scale geochemical data in the Karakoram Chalukou area,abnormal enrichment of basic elements such as Cr,Ni and Co was found,and with the increase of the amount of geochemical data,the anomaly morphology becomes more detailed.Therefore,it is inferred that the anomalous enrichment of basic elements is controlled by ultrabasic rocks and basaltic volcanic rocks with high Cr and Ni.After field investigation,it was found that there were many ultrabasic volcanic lava in the area from Tuanjiefeng to Xingshan mountain,the main lithology is peridotite and limburgite,and with pillow basalt,massive basalt and other basic lava,pyroclastic rocks associated.Based on the field occurrence and geochemical characteristics of ultrabasic rocks,combined with spinifex texture of the outcrop scale and microscopic,it is preliminarily identified as komatiite.In addition to the conventional nickel pyrite,violarite,millerite and chalcopyrite,pyrrhotite,ilmenite,etc.,it is extremely rare to have coppernickel sulfides and high magne-sium ilmenite in the komatiite with fine"sulphide clasts".The komatiite rock is the main host rock of coppernickel platinum group sulfide deposits in the world and because of its special geological significance,it is of great significance for prospecting other metallic and nonmetallic deposits.
作者
田江涛
赵同阳
杨万志
冯京
陈刚
朱志新
刘进喜
张小军
靳刘圆
韩琼
唐毅
Tian Jiangtao;Zhao Tongyang;Yang Wanzhi;Feng Jing;Chen Gang;Zhu Zhixi;Liu Jinxi;Zhang Xiaojun;Jin Liuyuan;Han Qiong;Tang Yi(Geological survey Institute of Xinjiang Autonomous Region,Urumqi,Xinjiang,830000,China;Xinjiang Bureau of Geology and Mineral Resources and Development,Urimuqi,Xinjiang,830000,China;Department of Natural Resources of Xinjiang Uygur Autonomous Region,Urimuqi,Xinjiang,830000,China)
出处
《新疆地质》
CAS
CSCD
2021年第3期357-364,共8页
Xinjiang Geology
基金
新疆和田县团结峰-兴山一带1∶5万矿产地质调查(K21-1-XJ001)
西昆仑地区铁铜金等重要矿产成矿地质条件研究与靶区优选(XGMB202041)
新疆矿产地质志项目(DD20160346-25)
新疆维吾尔自治区系列地质图件数据处理与洋板块地质研究(DD20190370)联合资助。
关键词
科马提岩
鬣刺结构
铜镍矿
喀喇昆仑山
Komatiite
Spinifex texture
Copper-nickel deposits
Karakoram
