1:250 000 Nagqu Sheet in northern Xizang and southern Qinghai
-
摘要: 地层方面,将测区地层划分为冈底斯-腾冲地层区和班公错-怒江结合带,班公湖-怒江结合带中又划分出聂荣微地块和觉翁-余拉山-下秋卡混杂带两个小区;按变质岩调查方法解体了聂荣地块;对原大面积分布的拉贡塘组进行了有效的解体;新建立嘎加组;恢复了郭曲群;将木嘎岗日岩群解体出3个岩组。岩石方面,在测区南部新发现了一套晚二叠世—早三叠世蛇绿岩。构造方面,构造单元表现为各组-下秋卡结合带和桑雄-那曲-麦地卡板片的构造格局;新发现达仁乡夺列蛇绿岩体。Abstract: The developments in stratigraphy are involved in the division of the surveyed area into the Gangdise-Nyainqentanglha-Tengchong stratigraphic province and Bangong-Nujiang suture zone; subdivision of the Bangong-Nujiang suture zone into the Nyainrong microcontinent and Jueweng-Yulashan-Xagquka mélange zone; redivision of the Nyainrong microcontinent and Lagongtang Formation; re-establishment of the Gajia Formation; reconstruction of the Guoqu Group; disintegration of the Muggar Kangri Group into three group complexes. Petrologically, new discovery includes a suite of the Late Permian-Early Triassic ophiolites in the southern part of the surveyed area and ophiolites in Duolie, Dagring Village. Tectonically, the tectonic units consist of the Gezu-Xagquka suture zone and Sangxung-Nagqu-Midika slab in the surveyed area.
-
Keywords:
- 1:250 000 /
- gelogical survey /
- Nagqu Sheet /
- development /
- northern Xizang
-
计量
- 文章访问数: 35
- HTML全文浏览量: 12
- PDF下载量: 70
下载:
