The Langjiexue Group is an in situ sedimentary sequence rather than an exotic block: Constraints from coeval Upper Triassic strata of the Tethys Himalaya (Qulonggongba Formation)
文献类型：期刊论文
| 作者 | Meng, Zhongyu1,2; Wang, Jiangang1; Ji, Weiqiang1; Zhang, Hao1,2; Wu, Fuyuan1; Garzanti, Eduardo3 |
| 刊名 | SCIENCE CHINA-EARTH SCIENCES
 |
| 出版日期 | 2019-05-01 |
| 卷号 | 62期号:5页码:783-797 |
| 关键词 | Tethys Himalaya Provenance analysis Langjiexue Group Detrital-zircon geochronology Tectonic setting Late Triassic Paleogeography |
| ISSN号 | 1674-7313 |
| DOI | 10.1007/s11430-018-9314-9 |
| 英文摘要 | The Upper Triassic Langjiexue Group in southeastern Tibet has long been an enigmatic geological unit. It belongs tectonically to the northern Tethys Himalayan zone, but provenance signatures of the detritus it contains are significantly different from those of typical Tethys Himalayan sandstones. Because the Langjiexue Group is everywhere in fault contact with Tethys Himalayan strata, its original paleogeographic position has remained controversial for a long time. According to some researchers, the Langjiexue Group was deposited onto the northern edge of the Indian passive continental margin, whereas others interpreted it as an independent block accreted to the northern Indian margin only during final India-Asia convergence and collision in the Paleocene. This study compares the Langjiexue Group and coeval Upper Triassic strata of the southern Tethys Himalayan zone (Qulonggongba Formation). Our new provenance data indicate that Qulonggongba Formation sandstones contain common felsic volcanic rock fragments, minor plagioclase, and euhedral to subhedral zircon grains yielding Late Paleozoic to Triassic ages. These provenance features compare well with those of the Langjiexue Group. Because the Qulonggongba Formation certainly belongs to the Tethys Himalayan zone, the provenance similarity with the Langjiexue Group indicates that the latter is also an in situ Tethys Himalayan sedimentary sequence rather than part of an exotic block. Volcanic detritus including Late Paleozoic to Triassic zircon grains in both Langjiexue Group and Qulonggongba Formation are interpreted to have been derived from the distant Gondwanide orogen generated by Pan-Pacific subduction beneath the southeastern margin of Gondwana. The Qulonggongba Formation, deposited above marlstones of the lower Upper Triassic Tulong Group, is overlain by India-derived coastal quartzose sandstones of the uppermost Triassic Derirong Formation. Deposition of both the Qulonggongba Formation and the Langjiexue Group were most likely controlled by regional tectonism, possibly a rifting event along the northern margin of Gondwana. |
| WOS关键词 | XIGAZE FORE-ARC ; ASIA COLLISION ONSET ; SOUTHERN TIBET ; LHASA TERRANE ; ISOTOPIC COMPOSITIONS ; DETRITAL ZIRCON ; PROVENANCE ; BASIN ; INDIA ; STRATIGRAPHY |
| 资助项目 | National Natural Science Foundation of China[41672109] ; Youth Innovation Promotion Associate Project of Chinese Academy of Science |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000463715900003 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science ; Youth Innovation Promotion Associate Project of Chinese Academy of Science |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/91314]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Wang, Jiangang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Milano Bicocca, Dept Earth & Environm Sci, Lab Provenance Studies, I-20126 Milan, Italy |
| 推荐引用方式 GB/T 7714 | Meng, Zhongyu,Wang, Jiangang,Ji, Weiqiang,et al. The Langjiexue Group is an in situ sedimentary sequence rather than an exotic block: Constraints from coeval Upper Triassic strata of the Tethys Himalaya (Qulonggongba Formation)[J]. SCIENCE CHINA-EARTH SCIENCES,2019,62(5):783-797. |
| APA | Meng, Zhongyu,Wang, Jiangang,Ji, Weiqiang,Zhang, Hao,Wu, Fuyuan,&Garzanti, Eduardo.(2019).The Langjiexue Group is an in situ sedimentary sequence rather than an exotic block: Constraints from coeval Upper Triassic strata of the Tethys Himalaya (Qulonggongba Formation).SCIENCE CHINA-EARTH SCIENCES,62(5),783-797. |
| MLA | Meng, Zhongyu,et al."The Langjiexue Group is an in situ sedimentary sequence rather than an exotic block: Constraints from coeval Upper Triassic strata of the Tethys Himalaya (Qulonggongba Formation)".SCIENCE CHINA-EARTH SCIENCES 62.5(2019):783-797. |
入库方式： OAI收割
来源：地质与地球物理研究所
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