新疆哈拉奇辉绿岩岩脉地球化学特征及构造意义  

Geochemistry Characteristics and Tectonic Significance of Diabase Dikes in Halaqi Region,Xinjiang

作　　者：陈代鑫[1] 孙军刚[1,2] 刘晓煌[2] 鲁世朋 张新勇[2] 张维新[2] 

机构地区：[1]中国地质大学(北京)地球:件学与资源学院,北京100083 [2]武警黄金第七支队,山东烟台264000

出　　处：《西北地质》2013年第4期81-92,共12页Northwestern Geology

基　　金：中国地质调查局项目“西部地区重要金属矿产资源调查评价”(1212011120495)

摘　　要：新疆哈拉奇地区出露的辉绿岩岩脉为研究西南天山地区的区域大地构造演化提供了重要信息。哈拉奇地区辉绿岩岩脉亏损高场强元素Nb、Ta和重稀土元素Yb、Y,富集大离子亲石元素Ba、Sr、K和轻稀土元素La、Ce,具亏损地幔的元素地球化学特征。可以理解为亏损的地幔在板块俯冲时受到板块俯冲改造,表明在晚石炭—早二叠纪时工作区应处于岛弧环境。The outcrop of diabase dikes in Halaqi of Xinjiang has provided important information for tectonic evolution of southwest Tianshan area. The diabase dikes in Halaqi area lack HFSE （Nb, Ta） and HREE （Yb, Y）, and exhibit enrichment in LILE （Ba, St, K） and LREE （La, Ce）. With the geochemical characteristics of depleted mantle, it can be understood as the mantle was transformed by subduction in plate subduction, indicating that during the Late Carboniferous-Early Permian, the region should have been in the island arc environment.

关 键 词：辉绿岩 晚石炭-早二叠纪 哈拉奇 

分 类 号：P588.124[天文地球—岩石学] P591[天文地球—地质学]