青海玉树地区三叠纪地层之下角度不整合面的发现及意义  

Discovery of angular unconformity below Triassic strata in the Yushu area, Qinghai

作　　者：赵仁夫[1] 朱迎堂[2] 周庆华[1] 王满仓 李建新[1] 孙南一[1] 

机构地区：[1]中国地质调查局西安地质矿产研究所,陕西西安710054 [2]成都理工大学沉积地质研究所,四川成都610059 [3]陕西省地质调查院,陕西周至710400

出　　处：《地质通报》2004年第5期616-619,共4页Geological Bulletin of China

基　　金：中国地质调查局青藏高原1:25万玉树县幅(I47C003001)地调项目成果。

摘　　要：在2003年1∶25万玉树县幅区域地质调查中,发现玉树地区三叠纪地层呈角度不整合覆盖于石炭纪—二叠纪地层之上,从而为确定西金乌兰-金沙江洋的封闭时代提供了确切的地层学依据,进一步证明了西金乌兰-金沙江带是华力西造山带。这一发现对认识古特提斯洋-陆转化过程具有重要意义。During 1:250000 regional geological survey of the Yushu County Sheet in 2003, it was found that in the Yushu area Triassic strata rest with angular unconformity on Carboniferous-Permian strata, thus providing definite stratigraphic evidence for the determination of the closing age of the Xijir Ulan-Jinsha River Ocean and further proving that the Xijir Ulan-Jinsha River junction zone is Variscan orogenic belt. This discovery has great significance for the understanding the process of the ocean-land transformation of the Paleo-Tethys.

关 键 词：青海玉树 三叠纪地层 角度不整合 西金乌兰-金沙江结合带 

分 类 号：P534.51[天文地球—古生物学与地层学] P542.2[天文地球—地质学]