喀喇昆仑岔路口地区玄武岩地幔柱信息  

Mantle Plume Information of Basalt in Karakorum Chalukou Area

作　　者：田江涛 唐毅 赵同阳 李涛 徐仕琪 张小军 Tian Jiangtao;Tang Yi;Zhao Tongyang;Li Tao;Xu Shiqi;Zhang Xiaojun(Geological Surve Insititute in Xinjiang Autonomous Region,Urumqi,Xinjiang,830000,China)

机构地区：[1]新疆维吾尔自治区地质调查院,新疆乌鲁木齐830000

出　　处：《新疆地质》2021年第2期198-209,共12页Xinjiang Geology

基　　金：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);第二次青藏高原综合科学考察研究(2019QZKK0806)共同资助。

摘　　要：研究区以基性火山熔岩为主,主要岩性为玄武岩,局部发育苦橄岩、科马提岩,科马提岩具微观鬣刺结构。以TiO_(2)=2.8为界,将玄武岩分为高钛玄武岩和低钛玄武岩,空间分布具明显分带性。岩石具与峨眉山玄武岩一致的近似平坦或轻稀土富集的稀土元素分布型式,相容性元素V,Co,Cr,Ni明显亏损,不相容元素和LREE富集。不相容元素在高钛玄武岩中富集程度大于低钛玄武岩。高钛玄武岩、低钛玄武岩的客观存在及产出的特殊构造背景,对喀喇昆仑地区古洋盆的演化和构造环境认识具重要地质意义。地幔柱及相应成矿系列,开拓了区内稀有金属、有色金属、贵金属富集的研究思路,对寻找大型及以上镍-铜-铂族、锡多金属、稀有金属矿床意义重大。The rocks of research aera mainly was comprised of basic volcanic rock,lithology constituted basalt and pi-crite primarily,developed komatiite which possessed spinifex texture.The TiO_(2) content of Basalt is used boundary with 2.8,divide into high-low Ti of basalt which has obvious zoning.The High-low basalt of research aera has accordance with Emeishan basalt that REE distributed flat pattern and light REE enriched distribution of pattern.The characteristic of elements that compatible elements such as V,Co,Cr,Ni has obviously loss,incompatible elements and LREE present-ed enrichment of state in high-low Ti basalt.incompatible elements in high Ti basalt enriched entent more than in low Ti basalt.Given that high and low Ti basalt existing objective significance and outputing specificIly tectonic background,the evolution and tectonic environmental cognition of paleo-ocean basin of Karakorum aera have an important meaning of geology.In research aera,mantle plume and corresponding metalgenetic series would open up rare metals,non-ferrous metals,noble metals to research cognition of enrichment,probing large-oversized scale above ore deposit of Ni-Cu-plati-num family,Sn multi-metal and rare metals,the future is expecting.

关 键 词：喀喇昆仑 高钛和低钛玄武岩 洋岛玄武岩 峨眉山玄武岩 地幔柱 

分 类 号：P588.145[天文地球—岩石学]