藏北聂荣县查吾拉区中侏罗统巴通阶与基底岩系角度不整合的发现及其地质意义

Discovery of an angular unconformity between the Middle Jurassic Bathonian Stage ang its underlying metamorphosed basement in the Chawola district, Nyainrong County, northern Tibet, and its geological significance

摘要: 在聂荣县查吾拉区一带首次发现中侏罗统巴通阶与下伏前奥陶系基底变质岩系之间呈角度不整合接触在包括查吾拉区在内的索县——左贡地层分区中．中侏罗统仅有巴通阶超覆不整合于“浅基底”变质岩系之上。反映了南、北羌塘盆地之间的中央隆起带不仅在双湖一带发育，而且在查吾拉区以东地区同样也发育。这一发现对该地层分区构造古地理的研究具有重要意义。

Abstract: An angular unconformable contact was for the first time found between the Middle Jurassic Bathonian Stage and its underlying pre-Ordovician metamorphosed basement in the Chawola district, in Nyainrong County. In the Sog County-Zogang stratigraphic area, including the Chawola district, only the Bathonian Stage in the Middle Jurassic unconformably overlaps on the "shallow basement" metamorphic series. This reflects that "the central uplift" in the Qiangtang basin is developed not only area of Shuanghu but also in the east of Chawola district. This discovery has great significance for the tectonic-paleogeographic study in this stratigraphic area.