| Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet | |
| Fan, SY (Fan, Suoya)1,2; Ding, L (Ding, Lin)1; Murphy, MA (Murphy, Michael A.)2; Yao, W (Yao, Wei)1; Yin, A (Yin, An)3; Fan, SY | |
| Source Publication | TECTONOPHYSICS
 |
| 2017 | |
| Volume | 721Issue:0Pages:415-434 |
| DOI | 10.1016/j.tecto.2017.10.022 |
| Abstract | 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. |
| Subject Area | 地质学 |
| WOS ID | WOS:000418309400028 |
| Language | 英语 |
| Indexed By | SCI |
| Keyword | Zircon U-pb Bangong-nujiang Ocean Indo-asian Collision Retroarc Foreland Basin Neo-tethys Ocean Volcanic-rocks Tectonic Implications Northern Tibet Suture Zone Crustal Growth |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics ; Geochemistry & Geophysics |
| Cooperation Status | 国际 |
| Subtype | Article |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itpcas.ac.cn/handle/131C11/7939 |
| Collection | 图书馆 |
| Corresponding Author | Fan, SY |
| Affiliation | 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China. 2.Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77204 USA. 3.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA. |
| Recommended Citation GB/T 7714 | Fan, SY ,Ding, L ,Murphy, MA ,et al. Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet[J]. TECTONOPHYSICS,2017,721(0):415-434. |
| APA | Fan, SY ,Ding, L ,Murphy, MA ,Yao, W ,Yin, A ,&Fan, SY.(2017).Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet.TECTONOPHYSICS,721(0),415-434. |
| MLA | Fan, SY ,et al."Late Paleozoic and Mesozoic evolution of the Lhasa Terrane in the Xainza area of southern Tibet".TECTONOPHYSICS 721.0(2017):415-434. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| V.721 415-434 2017.p（9424KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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