北祁连走廊南山西水地区加里东期大野口埃达克质闪长玢岩的成因及其地质意义  

Genesis and tectonic implications of Caledonian Dayekou adakite diorite porphyry of Xishui area,Zoulangnanshan,North Qilian Mountain

作　　者：唐卓[1] 王国强[1] 李向民[1] 朱涛[1] 罗根根[1] 计波[1] 卜涛 TANG Zhuo;WANG Guoqiang;LI Xiangmin;ZHU Tao;LUO Gengen;JI Bo;BU Tao(Xi＇an Geological Survey Center, China Geological Survey, 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,陕西西安710054

出　　处：《地质通报》2018年第4期716-723,共8页Geological Bulletin of China

基　　金：中国地质调查局项目<祁连肃南-大柴旦地区地质矿产调查>(编号:DD20160012)

摘　　要：北祁连走廊南山北坡西水地区的加里东期大野口岩体中闪长玢岩地球化学的研究表明,该套岩石的SiO_2>56%,Al_2O_3>15%,Na_2O>K_2O,富集大离子亲石元素和轻稀土元素,具正Eu异常,富集Sr元素、亏损重稀土元素Yb和Y,具有较高的Sr/Y值,表现出明显的埃达克岩的地球化学性质。结合岩体产出的时空位置,认为大野口岩体形成于奥陶纪与板块俯冲作用相关的俯冲洋壳部分熔融和壳幔岩浆混合作用。Geochemical studies of diorite porphyrite in Xishui area of Zoulangnanshan within North Qilian Mountain show that therock is characterized by SiO2〉56%, Al2O3〉15%, Na2O〉K2O%, LILE and LREE enrichment, positive Eu anomalies, Sr enrichment,depletion of heavy rare earth elements Yb and Y, and higher Sr/Y ratios, showing obvious geochemical characteristics of adakite. Ac.cording to the regional geological study, the authors hold that Dayekou diorite porphyrite was formed in the Caledonian Ordovicianperiod associated with subduction of the oceanic crust partial melting and crust-mantle magma mixing.

关 键 词：埃达克岩 大野口闪长玢岩 岩石成因 走廊南山 北祁连 

分 类 号：P588.1[天文地球—岩石学]