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| DOI | 10.1016/j.tecto.2017.10.022 |
| Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet | |
| Fan, Suoya; Ding, Lin; Murphy, Michael A.; Yao, Wei; Yin, An | |
| 通讯作者 | Fan, SY (通讯作者) |
| 发表日期 | 2017 |
| ISSN | 0040-1951 |
| EISSN | 1879-3266 |
| 起始页码 | 415 |
| 结束页码 | 434 |
| 卷号 | 721 |
| 英文摘要 | Models for the Mesozoic growth of the Tibetan plateau describe closure of the Bangong Ocean resulting in accretion of the Lhasa terrane to the Qiangtang terrane along the Bangong-Nuijiang suture zone (BNSZ). However, a more complex history is suggested by studies of ophiolitic melanges south of the BNSZ within the Lhasa terrane. One such melange belt is the Shiquanhe-Namu Co melange zone (SNMZ) that is coincident with the Geren Co-Namu Co thrust (GNT). To better understand the structure, age, and provenance of rocks exposed along the SNMZ we conducted geologic mapping, sandstone petrography, and U-Pb zircon geochronology of rocks straddling the SNMZ. The GNT is north-directed and places Paleozoic strata against the Yongzhu ophiolite and Cretaceous strata along strike. A gabbro in the Yongzhu ophiolite yielded a U-Pb zircon age of 153 Ma. Detrital zircon age data from Permian rocks in the hanging wall suggests that the Lhasa terrane has affinity with the Himalaya and Qiangtang, rather than northwest Australia. The Late Jurassic-Early Cretaceous Rila Formation overlies the ophiolite and shows signatures of syntectonic deposition. Detrital zircon ages from the Cretaceous Duoni Formation in the footwall of the GNT suggest that the provenance is mainly Early Cretaceous igneous rocks in the northern Lhasa terrane and Paleozoic strata in the hanging wall of the GNT. Our results support the interpretation that the SNMZ is a Late Jurassic-Early Cretaceous suture zone that resulted from closure of a small Jurassic ocean basin, thereby suggesting more Jurassic shortening than conventional models. The GNT developed along the SNMZ in the Early Cretaceous and facilitated exhumation of Paleozoic strata, which became a source for Cretaceous basins along the GNT. Early Cretaceous igneous rocks in northern Lhasa are interpreted to be a consequence of subduction of ocean lithosphere along the SNMZ and its later delamination. |
| 关键词 | ZIRCON U-PBNUJIANG OCEAN CONSTRAINTSVOLCANIC-ROCKSTECTONIC EVOLUTIONSUTURE ZONENEO-TETHYSCRUSTAL GROWTHACCRETIONARY COMPLEXGANGDESE BATHOLITHCRETACEOUS STRATA |
| 英文关键词 | Lhasa termite; Shortening; Foreland basin; Suture zone; Provenance; Geochronology |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000418309400028 |
| 来源期刊 | TECTONOPHYSICS
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/259023 |
| 推荐引用方式 GB/T 7714 | Fan, Suoya,Ding, Lin,Murphy, Michael A.,et al. Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet[J]. 中国科学院青藏高原研究所,2017,721. |
| APA | Fan, Suoya,Ding, Lin,Murphy, Michael A.,Yao, Wei,&Yin, An.(2017).Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet.TECTONOPHYSICS,721. |
| MLA | Fan, Suoya,et al."Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet".TECTONOPHYSICS 721(2017). |
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