| 摘要: |
| 新建9个正式岩石地层单位、4个非正式地层单位;将上三叠统日干配错群解体为6个岩石地层单元;解体中上侏罗统雁石坪群;将色哇组分为三段;将班公湖-怒江带木嘎岗日群解体为4个岩石地层单元;在西藏首次发现(上三叠统姜钟组)纳拉菁耳羽叶;在羌塘盆地首次发现(下—中侏罗统色哇组)辐鳍鱼类化石;新建8个侵入岩填图单位,时代为晚侏罗世—新近纪末期;在班-怒结合带塔仁本一带首次发现了洋岛型玄武岩;新发现了一系列新生代岩浆岩;在班-怒带及南羌塘盆地中发现一些呈串珠状分布的小型斑岩体;发现班-怒带上时代最新的枕状玄武岩。 |
| 关键词: 1:25万 地质调查 帕度错幅 昂达尔错幅 成果与进展 西藏 |
| DOI： |
| 附件 |
| 投稿时间：2004-12-10 |
| 基金项目: |
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| 1:250 000 Baidoico and Angdarco Sheets in Xizang |
| Jilin Institute of Geological Survey |
| (Jilin Institute of Geological Survey, Changchun 130061, Jilin, China) |
| Abstract: |
| Nine formal and four informal lithostratigraphic units have recently been established. The Upper Triassic Rigain Punco Group is dismembered into six lithostratigraphic units, including Jiangzhong, Nongbai, Jiangzhuangri, Zhana, Duogaila and Suobucha Formations. The Middle and Upper Jurassic Yanshiping Group is redivided into Biluoco, Longba and Nicha Formations. The Sewa Formation is subdivided into the upper, middle and lower members. The Muggar Kangri Group in the Bangong-Nujiang suture zone is dismembered into four lithostratigraphic units:Muggar Kangri Group Complex, Tarenben oceanic-island basalts, Tukari Formation and Shamuluo Formation. The plant fossils Otozameites nalajingensis are firstly collected from the Upper Triassic Jiangzhong Formation, and the fish fossils Actinopterygii from the Lower-Middle Jurassic Sewa Formation in the Qiangtang Basin. Eight mappable intrusive units of Late Jurassic to latest Neogene ages are constructed. The recent develepments also include the recognition of oceanic-island basalts in the Tarenben region of the Bangong-Nujiang suture zone, Cenozoic magmatic rocks, small beaded porphyry masses in the Bangong-Nujiang suture zone and South Qiangtang Basin, and youngest pillow basalts in the Bangong-Nujiang suture zone. |
| Key words: 1:250 000 geological survey Baidoico Sheet Angdarco Sheet development Xizang |
