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| DOI | 10.1016/j.gr.2019.10.008 |
| The latest Jurassic protoliths of the Sangsang mafic schists in southern Tibet: Implications for the spatial extent of Greater India | |
| Wang, Hou-Qi; Ding, Lin; Cai, Fu-Long; Sun, Ya-Li; Li, Shun; Yue, Ya-Hui; Fan, Shuai-Quan; Guo, Xu-Dong; Qasim, Muhammad | |
| 通讯作者 | Wang, HQ (通讯作者) |
| 发表日期 | 2020 |
| ISSN | 1342-937X |
| EISSN | 1878-0571 |
| 起始页码 | 248 |
| 结束页码 | 262 |
| 卷号 | 79 |
| 英文摘要 | Field observations, petrology, zircon geochronology, whole-rock geochemistry, and Sr-Nd isotopes were used to reveal the lithology, age, and tectonic setting of the protoliths of the Sangsang matk schists in the Yarlung Zangbo Suture Zone (YZSZ), central southern Tibet. The mafic schists occur as exotic blocks within the accretionary complex of the YZSZ. Relic amygdaloidal features indicate the schist protoliths were volcanic rocks. The mineral assemblage mainly comprises riebeckite + magnesioriebeckite + chlorite + sericite + albite + relic clinopyroxene. The youngest group of zircon ages constrains the formation time of the protoliths to 1492 2.2 Ma ( i.e., latest Jurassic). Abundant Paleozoic and older zircons suggest the protolith volcanic rocks were erupted onto a continental terrane. Whole -rock geochemical and Sr-Nd isotopic data indicate the protoliths were of ocean island basalt affinity. The mafic schists mostly have high-Ti, alkaline, basaltic compositions with 43.57-46.93 wt% Si02, 3.27-724 wt% Na70 + K20, and 4.04-4.69 wt' Ti02. The schists are enriched in light rare earth elements relative to heavy rare earth elements, and have (LalYb)N 5.85-3.53 and small positive Ta and negative Zr-Hf anomalies. (87Sr/86Sr)i values vary from 0.7044 to 0.7055, while ( mlNcl/m4Ncl)i ranges from 0.512670 to 0.512727, with 01(1(0 values of +44 to +5.5. The protoliths of the mafic schists were probably formed in a within-plate extension setting associated with mantle plume upwelling and melting of continental lithosphere. This setting was related to the Late Jurassic continental breakup of Argoland off the northern margin of east Gondwana, and thus marked the paleoposition of the northern edge of Greater India before the breakup of India from east Gondwana during Early Cretaceous, The N -S extent of Greater India at that time was -2400 km. This further indicates how the India -Eurasia continental convergence has been accommodated. (C) 2019 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
| 关键词 | ZANGBO SUTURE ZONEFORE-ARC BASINYARLUNG-TSANGPO SUTURESUBDUCTION-ACCRETION PROCESSESLHASA TERRANE IMPLICATIONSEASTERN TETHYAN HIMALAYAVOLCANIC-ROCKSNEO-TETHYSSEDIMENTARY HISTORYFACIES ARCHITECTURE |
| 英文关键词 | Greater India; Sangsang mafic schists; East Gondwana; Continental breakup; India-Eurasia collision |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000522974100015 |
| 来源期刊 | GONDWANA RESEARCH
 |
| 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/259953 |
| 推荐引用方式 GB/T 7714 | Wang, Hou-Qi,Ding, Lin,Cai, Fu-Long,et al. The latest Jurassic protoliths of the Sangsang mafic schists in southern Tibet: Implications for the spatial extent of Greater India[J]. 中国科学院青藏高原研究所,2020,79. |
| APA | Wang, Hou-Qi.,Ding, Lin.,Cai, Fu-Long.,Sun, Ya-Li.,Li, Shun.,...&Qasim, Muhammad.(2020).The latest Jurassic protoliths of the Sangsang mafic schists in southern Tibet: Implications for the spatial extent of Greater India.GONDWANA RESEARCH,79. |
| MLA | Wang, Hou-Qi,et al."The latest Jurassic protoliths of the Sangsang mafic schists in southern Tibet: Implications for the spatial extent of Greater India".GONDWANA RESEARCH 79(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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