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内蒙古苇莲河石英脉型黑钨矿赋矿花岗岩成岩时代、地球化学特征及其地质意义

向安平, 陈毓川, 佘宏全, 李光明, 李应栩. 2018. 内蒙古苇莲河石英脉型黑钨矿赋矿花岗岩成岩时代、地球化学特征及其地质意义[J]. 中国地质, 45(5): 963-976. doi: 10.12029/gc20180506
引用本文: 向安平, 陈毓川, 佘宏全, 李光明, 李应栩. 2018. 内蒙古苇莲河石英脉型黑钨矿赋矿花岗岩成岩时代、地球化学特征及其地质意义[J]. 中国地质, 45(5): 963-976. doi: 10.12029/gc20180506
XIANG Anping, CHEN Yuchuan, SHE Hongquan, LI Guangming, LI Yingxu. 2018. Chronology and geochemical characteristics of granite in Weilianhe of Inner Mongolia and its geological significance[J]. Geology in China, 45(5): 963-976. doi: 10.12029/gc20180506
Citation: XIANG Anping, CHEN Yuchuan, SHE Hongquan, LI Guangming, LI Yingxu. 2018. Chronology and geochemical characteristics of granite in Weilianhe of Inner Mongolia and its geological significance[J]. Geology in China, 45(5): 963-976. doi: 10.12029/gc20180506

内蒙古苇莲河石英脉型黑钨矿赋矿花岗岩成岩时代、地球化学特征及其地质意义

  • 基金项目:
    国家基础科研项目(2013CB429800)、中国地质调查局综合地质调查项目(121201010000150014)联合资助
详细信息
    作者简介: 向安平, 1986年生, 男, 博士, 助理研究员, 矿物学、岩石学、矿床学专业; E-mail:xap2011@sina.cn
  • 中图分类号: P597;P588.12+1

Chronology and geochemical characteristics of granite in Weilianhe of Inner Mongolia and its geological significance

  • Fund Project: Supported jointly by National Basic Research Project (No. 2013CB429800), Comprehensive Geological Survey Project (No121201010000150014)
More Information
    Author Bio: XIANG Anping, male, born in 1986, doctor, assistant researcher, majors in mineralogy, petrology and mineral deposits; E-mail:xap2011@sina.cn .
  • 内蒙古苇莲河地区是近年来进行黑钨矿找矿勘查的区域,位于兴蒙造山带中东部,大兴安岭主脊中部。矿床类型可能为典型的石英脉型黑钨矿。黑钨矿石英脉以近于直立(75°)的平直脉体产于花岗岩内或岩体与地层的外接触带,脉体向下尖灭于岩体内部,主要的矿化蚀变类型有钾长石化、绿帘石化、绢云母化、硅化等。本文在初步研究矿床地质特征的基础上,对成矿岩体——花岗岩进行高精度LA-ICP-MS锆石U-Pb测年及地球化学分析。UPb测年结果显示,206Pb/238U谐和年龄为(145±1)Ma,加权平均年龄为(143±1)Ma。地球化学特征显示,岩体具有典型的富硅、富碱特征,SiO2平均74.13%,(Na2O+K2O)平均9.44%,Na2O/K2O平均0.95,属高钾钙碱性系列岩石;Al2O3平均为12.91%,铝饱和指数A/CNK全部靠近1.0,为准铝质到弱过铝质花岗岩类,相对贫Mg;稀土总量较低,∑REE变化于122.02×10-6~235.79×10-6,表现为右倾稀土元素配分模式,弱富集轻稀土,并具有强烈的负铕异常,高场强元素Th、U、Nd、Hf明显富集,而Ba、Sr、P、Ti、Nb显著亏损;低Sr,高Yb,Nb/Ta比值变化于12.12~13.78,强不相容元素Rb高度富集,Rb/Sr比值1.25~14.58,Ti/Y比值42.49~114.48,Ti/Zr比值5.20~8.45;总体为壳源岩浆的特征。苇莲河花岗岩侵位时代为早白垩世,属燕山期构造岩浆活动的产物,其可能的形成构造背景为古太平洋板块斜向俯冲后,后退过程中的伸展滑塌背景。

  • 加载中
  • 图 1  苇莲河矿区区域地质图(据1:20万区域地质图修改)

    Figure 1. 

    图 2  苇莲河矿区黑钨矿矿脉、矿石及镜下特征

    Figure 2. 

    图 3  苇莲河矿区围岩蚀变特征

    Figure 3. 

    图 4  苇莲河花岗岩及镜下特征

    Figure 4. 

    图 5  苇莲河钨矿区花岗岩锆石CL图像及测年数据分析点位

    Figure 5. 

    图 6  苇莲河钨矿区花岗岩锆石U-Pb年龄谐和图(a)和加权平均年龄图(b)

    Figure 6. 

    图 7  苇莲河花岗岩SiO2-K2O图解(a)和A/CNK-A/NK图解(b)

    Figure 7. 

    图 8  苇莲河花岗岩稀土元素球粒陨石标准化配分曲线(a)和微量元素原始地幔标准化蛛网图(b)

    Figure 8. 

    图 9  (Zr+Nb+Ce+Y)-[(K2O+Na2O)/CaO]关系图

    Figure 9. 

    图 10  苇莲河花岗岩主量元素构造判别图

    Figure 10. 

    图 11  苇莲河花岗岩微量元素构造判别图解

    Figure 11. 

    表 1  苇莲河钨矿区花岗岩LA-ICP-MS锆石U-Pb同位素分析数据

    Table 1.  Zircon LA-ICP-MS U-Pb isotopic data for the granite from the Weilianhe W ore district

    下载: 导出CSV

    表 2  苇莲河钨矿区花岗岩主微量(%)及微量(10-6)元素分析结果

    Table 2.  Major elements (%), trace elements (10-6) composition of the granite in the Weilianhe W ore district

    下载: 导出CSV
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出版历程
收稿日期:  2016-11-07
修回日期:  2017-12-18
刊出日期:  2018-10-25

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