...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Palaeoproterozoic metamorphism in the Jeori-Wangtu Gneissic Complex (JWGC), western Himalayas
【24h】

Palaeoproterozoic metamorphism in the Jeori-Wangtu Gneissic Complex (JWGC), western Himalayas

机译：喜马拉雅山西部的Jeori-Wangtu片麻岩复合体（JWGC）的古元古代变质作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Jeori-Wangtu Gneissic Complex (JWGC) exposed as a tectonic window in the Lesser Himalayas represents one of the oldest Gneissic Complex of the Himalayas. Foliated granite and the metapelite constitute the dominant lithologies of the JWGC. The western margin of the JWGC is bounded by a brittle shear while in the east, the tectonic surface is a ductile shear zone. Kyanite schist, chloritoid schist, staurolite schist (St-1), garnet schist and staurolite schist (St-2) are present in a west to east sequence beginning from near to the Jhakhri thrust and up to the contact with the JWGC granite. Mica schist is intermittently present and is the dominant metapelite. Low to medium grade regional metamorphic conditions has been inferred for these rocks. Calc silicate enclaves within the JWGC granite preserve the contact metamorphic effects. These are reflected in development of narrow zones of disequilibrium assemblages of calcareous garnet (grs_(～53)), clinopyroxene, K feldspar, calcic plagioclase (An_(86)), quartz, zoned sphene, zoned allanite, amphiboles, calcite and epidote. Recording of contact metamorphic assemblage of 1.80 Ga granite witin the enclave calc silicates and in the host metapelites over an earlier, relict low to medium grade assemblage indicates that the JWGC preserves palaeoproterozoic metamorphic imprints.
机译：在小喜马拉雅山中以构造窗形式暴露的Jeori-Wangtu片麻岩复合体（JWGC）代表了喜马拉雅山脉最古老的片麻岩复合体之一。片状花岗岩和变质岩构成了JWGC的主要岩性。 JWGC的西缘以脆性剪切作用为界，而在东部，构造面为韧性剪切带。蓝晶岩片岩，类藻酸盐片岩，星形石片岩（St-1），石榴石片岩和星形石片岩（St-2）以从西到东的顺序出现，从Jhakhri逆冲开始，一直到与JWGC花岗岩接触为止。云母片岩断断续续存在，并且是主要的变质岩。已推断出这些岩石的中低品位区域变质条件。 JWGC花岗岩中的钙硅酸盐飞地保留了接触变质作用。这些反映在钙质石榴石（grs_（〜53）），斜发rox石，钾长石，斜长石钙化石（An_（86）），石英，带状蝶骨，带状尿囊石，斜闪石，方解石和山竹石的狭窄不平衡组合的发展中。记录了在飞地钙硅酸盐中和在主体变质岩中的1.80 Ga花岗岩的接触变质组合，在较早的，残存的低至中等级组合中，表明JWGC保留了古元古代变质印记。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号