内蒙古大青山地区石榴花岗岩的地质特征和岩相学特征  

GEOLOGY AND PETROGRAPHY OF THE GARNET GRANITE IN DAQINGSHAN AREA, INNER MONGOLIA

作　　者：吴新伟[1,2,3] 徐仲元[3] 刘正宏[3] 宋海峰[4] 陈晓锋[5] 

机构地区：[1]沈阳地质矿产研究所 [2]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [3]吉林大学地球科学学院,吉林长春130061 [4]长春工程学院,吉林长春130021 [5]中国地质科学院,北京100037

出　　处：《地质与资源》2013年第5期347-354,359,共9页Geology and Resources

基　　金：中国地质调查局"内蒙古包头地区1:25万区域地质调查项目"(200113000021);"内蒙古1:5万济沁河林场等四幅区域地质调查项目"(1212011120664)资助

摘　　要：内蒙古大青山地区石榴花岗岩出露于哈德门沟-平方沟-虎本汉沟一带,沿麻粒岩系与孔兹岩系之间的构造不整合面呈不规则带状分布,从其野外地质特征和岩相学特征可确定石榴花岗岩与围岩为渐变过渡关系.石榴花岗岩中的变质表壳岩以及部分包体不仅在岩性上可与外围的同类岩石对比,而且也显示了明显的深熔作用改造的痕迹.现有证据表明石榴花岗岩总体上是由孔兹岩系的石榴黑云片麻岩原地熔融形成的,为深熔作用的产物.石榴花岗岩的研究为本区的深熔作用演化提供了依据.The garnet granite in Daqingshan area, Inner Mongolia shows irregular zonal distribution along the structural unconformity between granulite series and khondalite series. Based on field geological survey and petrographical characteristics, the transitional relation between the garnet granite and surrounding rocks can be determined. The metamorphic supracrustal rocks and part of enclosures in the garnet granite can not only be compared with those of periphery similar rocks in lithology, but also show evident anatectic reformation. Existing evidence suggests that the garnet granite should be generally formed by in-situ melting of garnet biotite gneiss of khondalite series, as a product of anatexis, which provides a basis for the evolution of anatexis in this area.

关 键 词：石榴花岗岩 深熔作用 深熔片麻岩 岩相学特征 内蒙古 

分 类 号：P588.12[天文地球—岩石学]