【摘要】 各拉丹冬地区位于青海省唐古拉山地区北坡,变质岩研究程度较低。唐古拉山地区是揭开澜沧江结合带北延寻踪的关键性地区之一,近年笔者等在开展1∶25万赤布张错幅区域地质调查时,对该区的变质岩及围岩蚀变进行了系统调查,尤其是在测区西南部亚恰一带首次发现一套变质岩(时代问题尚存争论),但进一步丰富了唐古拉山地区变质岩内容。本文系集体力量的成果,对区内变质岩特征进行了总结,为进一步研究唐古拉山地区乃至北羌塘坳陷东南部盆地基底特征和双湖—澜沧江变质带提供了重要的基础地质资料,对高原腹地的变质岩详细研究具有启示意义。更多还原

【Abstract】 Geladandong area in origin area of the Yangtze River locates in the west of Tanggulasan,the metamorphic rocks is lack of research.During 1∶250 000 regional geological survey of Chibuzhangcuo,we surveyes Metamorphic rocks and corrode in the area,it is very important that a metamorphic series exposed at the west-south of Yaqia is for the first time found.It is the one of hinge area for tracing Lanchangjiang belt.Although geologic time still keeps different opinion each other,we argue that it provides stratigraphic evidence for the determination of the closing age of Shuanghu-Lanchang RiverOcean and tectonic contact relationship with the overlying upper stratigraphics,and enriches content of metamorphic rocks in Tanggulasan area.The text is outcome of collectivity,summarizes the characteristics of metamorphic rocks in the area.This discovery has great significance for the understanding the ocean-land transformation of the Paleo-Tethys.更多还原