Xigaze forearc basin revisited (South Tibet): Provenance changes and origin of the Xigaze Ophiolite
文献类型：期刊论文
| 作者 | An, Wei1; Hu, Xiumian1; Garzanti, Eduardo2; BouDagher-Fadel, Marcelle K.3; Wang, Jiangang4; Sun, Gaoyuan1 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2014-11-01 |
| 卷号 | 126期号:11-12页码:1595-1613 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B31020.1 |
| 文献子类 | Article |
| 英文摘要 | Our new stratigraphic, sedimentological, and micropaleontological analysis, integrated with basalt geochemistry, sandstone petrography, and detrital-zircon U-Pb and Hf isotope data, suggests the revision of current models for the geological evolution of the Asian active margin during the Cretaceous. The Xigaze forearc basin began to form in the late Early Cretaceous, south of the Gangdese arc, during the initial subduction of the Neotethyan oceanic lithosphere under the Lhasa terrane. Well-preserved stratigraphic successions document the classical upward-shallowing pattern of the forearc-basin strata and elucidate the origin of the associated oceanic magmatic rocks. The normal mid-ocean-ridge basalt (N-MORB) geochemical signature and stratigraphic contact with the overlying abyssal cherts (Chongdui Formation) indicate that the Xigaze Ophiolite formed by forearc spreading and represents the basement of the forearc sedimentary sequence. Volcaniclastic sedimentation began with thick turbiditic sandstones and interbedded shales in the late Albian-Santonian (Ngamring Formation) followed by shelfal, deltaic, and fluvial strata (Padana Formation), with final filling of the basin by the Campanian age. Forearc sandstones do not show the classical trend from feldspatholithic volcaniclastic to quartzo-feldspathic plutoniclastic compositions, indicating limited unroofing of the Gangdese arc prior to collision. U-Pb age spectra of detrital zircons are unimodal with a 107 Ma peak in the lower Ngamring Formation (104-99 Ma), bimodal with a subordinate additional peak at 157 Ma in the middle Ngamring Formation (99-88 Ma), and multimodal with more abundant pre-Mesozoic ages in the upper Ngamring and Padana Formations (88-76 Ma). These three petrofacies with distinct provenances document the progressive erosional evolution of the Gangdese arc, with uplift of the central Lhasa terrane and expanding river catchments to include the central Lhasa terrane during the Late Cretaceous. |
| WOS关键词 | ZANGBO SUTURE ZONE ; ZIRCON U-PB ; YARLUNG-TSANGPO SUTURE ; SUBDUCTION-ACCRETION PROCESSES ; HF ISOTOPIC CONSTRAINTS ; VOLCANIC-ROCKS ; TECTONIC EVOLUTION ; CENTRAL CALIFORNIA ; LHASA TERRANE ; NEOTETHYAN SUBDUCTION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000343759600012 |
| 出版者 | GEOLOGICAL SOC AMER, INC |
| 资助机构 | Ministry of Science and Technology of the People's Republic of China 973 Project(2012CB822001) ; Ministry of Science and Technology of the People's Republic of China 973 Project(2012CB822001) ; Natural Science Foundation of China Project(41172092) ; Natural Science Foundation of China Project(41172092) ; Ministry of Science and Technology of the People's Republic of China 973 Project(2012CB822001) ; Ministry of Science and Technology of the People's Republic of China 973 Project(2012CB822001) ; Natural Science Foundation of China Project(41172092) ; Natural Science Foundation of China Project(41172092) ; Ministry of Science and Technology of the People's Republic of China 973 Project(2012CB822001) ; Ministry of Science and Technology of the People's Republic of China 973 Project(2012CB822001) ; Natural Science Foundation of China Project(41172092) ; Natural Science Foundation of China Project(41172092) ; Ministry of Science and Technology of the People's Republic of China 973 Project(2012CB822001) ; Ministry of Science and Technology of the People's Republic of China 973 Project(2012CB822001) ; Natural Science Foundation of China Project(41172092) ; Natural Science Foundation of China Project(41172092) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/86030]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | An, Wei |
| 作者单位 | 1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210029, Jiangsu, Peoples R China 2.Univ Milano Bicocca, Dept Earth & Environm Sci, I-20126 Milan, Italy 3.UCL, Dept Earth Sci, London WC1E 6BT, England 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | An, Wei,Hu, Xiumian,Garzanti, Eduardo,et al. Xigaze forearc basin revisited (South Tibet): Provenance changes and origin of the Xigaze Ophiolite[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2014,126(11-12):1595-1613. |
| APA | An, Wei,Hu, Xiumian,Garzanti, Eduardo,BouDagher-Fadel, Marcelle K.,Wang, Jiangang,&Sun, Gaoyuan.(2014).Xigaze forearc basin revisited (South Tibet): Provenance changes and origin of the Xigaze Ophiolite.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,126(11-12),1595-1613. |
| MLA | An, Wei,et al."Xigaze forearc basin revisited (South Tibet): Provenance changes and origin of the Xigaze Ophiolite".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 126.11-12(2014):1595-1613. |
入库方式： OAI收割
来源：地质与地球物理研究所
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