内蒙古苏左旗白音宝力道Adakite质岩类成因探讨及其SHRIMP年代学研究

石玉若　刘敦一　张旗　简平　张福勤　苗来成　施光海　张履桥　陶华

内蒙古苏左旗白音宝力道Adakite质岩类成因探讨及其SHRIMP年代学研究

石玉若　刘敦一　张旗　简平　张福勤　苗来成　施光海　张履桥　陶华

- 中国地质科学院地质研究所北京离子探针中心，中国地质科学院地质研究所北京离子探针中心，中国科学院地质与地球物理研究所所，中国地质科学院地质研究所北京离子探针中心，中国科学院地质与地球物理研究所所，中国科学院地质与地球物理研究所所，中国科学院地质与地球物理研究所所，内蒙古地质研究所，中国地质科学院矿产资源研究所北京 100037，北京 100037，北京 100029，北京 100037，北京 100029，北京 100029，北京 100029，呼和浩特 010020，北京 100037
基金项目:
国家自然科学基金重点项目(编号:40234045)国土资源部重大基础(编号:2000206)的成果

修回日期: 2004-05-18

刊出日期: 2005-01-31

The petrogenesis and SHRIMP dating of the Baiyinbaolidao adakitic rocks in southern Suzuoqi, Inner Mongolia

Revised Date: 18 May 2004

Publish Date: 31 January 2005

摘要

摘要: 内蒙古苏左旗白音宝力道闪长质岩类的地球化学特征类似典型的埃达克岩,其SiO3含量≥56%(61.1-61.6%),Al2O3含量均大于15%(16.6-17.1%),MgO3%,Na2O/K2O比值较高(1.8-2.7,平均2.2),亏损HREE,Yb含量400μg/g)、贫Y(14.5-16.2μg/g,40(40-42),在微量元素蛛网图上具明显的Sr正异常。表明其成因与板块的俯冲作用有关,可能是消减的MORB板片部分熔融的产物。精确的SHRIMP皓石U-Pb年龄测定显示,内蒙古苏左旗白音宝力道英云闪长岩的结晶年龄为464±8Ma和479 8Ma,结合前人的SHRIMP定年资料,该闪长质岩体的年龄范围可能在464-490Ma之间。表明内蒙古中部的板块俯冲事件发生在早奥陶世。
- 苏左旗 /
- 埃达克质岩石 /
- SHRIMP /
- 早奥陶世
- Suzuoqi /
- Adakitic rocks /
- SHRIMP /
- Early Ordovician

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内蒙古苏左旗白音宝力道Adakite质岩类成因探讨及其SHRIMP年代学研究

The petrogenesis and SHRIMP dating of the Baiyinbaolidao adakitic rocks in southern Suzuoqi, Inner Mongolia

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