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| 试论西藏南部上三叠统复理石郎杰学群与涅如组 | |
| 引用本文： | 李祥辉.试论西藏南部上三叠统复理石郎杰学群与涅如组[J].地质学报,2011,85(10):1551-1562. |
| 作者姓名： | 李祥辉 |
| 作者单位： | 1. 南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室,南京,210093 2. 成都理工大学沉积地质研究院,成都,610059 3. 西藏自治区地质调查院一分院,拉萨,850000 |
| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
| 摘 要： | 根据新资料结合前人的研究成果对西藏南部仁布以东上三叠统复理石两套地层郎杰学群和涅如组的岩层特征、化石面貌、碎屑组成、沉积特性、地球化学等方面进行了总结及分析.对比研究结果显示,除亚相、岩层厚度分布、砂岩与板岩比例、重矿物ZTR指数变化趋势有一定的差异外,郎杰学群和涅如组的其他十余项特性(颜色、岩性、碎屑组分、重矿物组成... |
| 关 键 词： | 郎杰学群 涅如组 复理石 上三叠统 西藏南部 |
| 收稿时间： | 2/9/2011 11:32:07 AM |
| 修稿时间： | 9/10/2011 3:35:16 PM |
Contrasting the Upper Triassic flysch Langjuexue Group and Nieru Formation in southern Tibet |
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| Li Xianghui.Contrasting the Upper Triassic flysch Langjuexue Group and Nieru Formation in southern Tibet[J].Acta Geologica Sinica,2011,85(10):1551-1562. | |
| Authors: | Li Xianghui |
| Institution: | Nanjing University |
| Abstract: | Features of the Upper Triassic flysch Langjiexue Group and Nieru Formation in southern Tibet were summarized and analysed by combination of the former and present works, within which stratigraphic property, fossil association, detritus component, sedimentation, geochemistry and metamorphism as well as deformation were contrasted. Study results show that most of the features are pretty similar between Langjiexue Group and Nieru Formation except for a few indexes such as subfacies, thickness, ratio of sandstone / slate, ZTR tendency. The discrepancy of the four indexes between is not suggested as real reasons to separate the two lithostratigraphic units because changes of subfacies, thickness, and ratio of lithology are normal within and among formations. The high similarities of features indicate that they could have been deposited in a same sedimentary basin and tectonic setting, probably in the basin related to orogenism. In another word, they could be formed in neither the passive margin (Himalayan terrane) nor accretionary wedge (Yarlung Zangbo suture). It is proposed that the Nieru Formation is a unit of the Langjiexue Group but not independent. Further more, the Renbu-Zhangda-Longzi fault is suggested as either the main fault of the Late Cretaceous oceanic subduction within the Yarlung Zangbo suture zone or a southern boundary fault of the Late Jurassic-Early Cretaceous subduction of the paleo-ophiolite crust. |
| Keywords: | Langjiexue Group Nieru Formation flysch Upper Triassic southern Tibet |
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