| 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。 |
| 关键词: 1:25万 地质调查 那曲县幅 成果与进展 藏北青南 |
| DOI： |
| 附件 |
| 投稿时间：2004-12-10 |
| 基金项目: |
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| 1:250 000 Nagqu Sheet in northern Xizang and southern Qinghai |
| No.1 Party, Xizang Institute of Geological Survey |
| (No.1 Party, Xizang Institute of Geological Survey, Lhasa 851400, Xizang, China) |
| 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. |
| Key words: 1:250 000 gelogical survey Nagqu Sheet development northern Xizang southern Qinghai |
