阿尔泰可可托海地区泥盆纪花岗岩特征及其地质意义
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  • 英文篇名:Characteristics and Geological Significance of the Devonian Granitoids in Koktokay Area of Altay
  • 作者:王星 ; 蔺新望 ; 张亚峰 ; 郭岐明 ; 陈宁 ; 赵端昌 ; 张随安
  • 英文作者:WANG Xing;LIN Xinwang;ZHANG Yafeng;GUO Qiming;CHEN Ning;ZHAO Duanchang;ZHANG Suian;Shaanxi Center of Geological Survey;
  • 关键词:花岗岩 ; 泥盆纪 ; 陆缘弧 ; 可可托海 ; 阿尔泰
  • 英文关键词:granitoids;;Devonian;;island-arc;;Koktokay;;Altay
  • 中文刊名:XBDI
  • 英文刊名:Northwestern Geology
  • 机构:陕西省地质调查中心;
  • 出版日期:2015-09-05
  • 出版单位:西北地质
  • 年:2015
  • 期:v.48;No.197
  • 基金:中国地质调查局“新疆1:25万可可托海幅、江德勒克幅区调修测”(1212011120503)、“新疆青河县1:5万(L46E005001、L46E005002、L46E006001、L46E006002)4幅区调”(1212011120509)
  • 语种:中文;
  • 页:XBDI201503031
  • 页数:11
  • CN:03
  • ISSN:61-1149/P
  • 分类号:257-267
摘要
阿尔泰南缘可可托海地区发育大量的400Ma左右的泥盆纪花岗岩。岩石SiO_2含量在62.36%~77.41%,里特曼指数σ介于0.43~1.88,A/CNK值在0.97~1.12,属中钾、钙碱性、准铝质-弱过铝质岩石。具有富集Rb、Th、U等大离子亲石元素和轻稀土元素,相对亏损重稀土和Nb、Ta、Ti等高场强元素,弱-中的负Eu异常的岛弧岩浆岩特征。结合区域地质资料,可可托海地区泥盆纪花岗岩形成于活动大陆边缘的陆缘弧构造环境,是古亚洲洋向北俯冲的产物。
        The Koktokay area is located in the southern part of Altay,where Devonian granitoids were well developed and the ages of the granitiods are about 400 Ma.The SiO_2 content ranges from 62.36%to 77.41%,and σ from 0.43 to 1.88,A/CNK from 0.97 to 1.12,implying the granitoid belongs to mid-K,calc-alkaline,quasi-aluminous and weak peraluminous rocks.In addition,they are enriched in LILE(Rb,Th,U) and LREE,obvious depleted of HREE and HFSE(Nb,Ta,Ti),besides,they have island-arc magmatite features characterized by weakmedium negative Eu anomaly.Combined with the regional geological data,the Devonian granitoids is a product of Paleo-Asian Ocean subduction toward north,and generated in an island-arc setting of active continental margin.
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