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Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet
Wang, HQ (Wang, Hou-Qi)1,2; Ding, L (Ding, Lin)1,3; Kapp, P (Kapp, Paul)2; Cai, FL (Cai, Fu-Long)1,3; Clinkscales, C (Clinkscales, Christopher)2; Xu, Q (Xu, Qiang)1,3; Yue, YH (Yue, Ya-Hui)1,3; Li, S (Li, Shun)1; Fan, SQ (Fan, Shuai-Quan)4
Source PublicationTECTONOPHYSICS
2018-12-02
Volume744Issue:0Pages:373-389
DOI10.1016/j.tecto.2018.07.024
Abstract

The accretionary complex of the Yarlung Zangbo Suture Zone (YZSZ) in southern Tibet records the subduction-accretion process of Neo-Tethys oceanic lithosphere. We report field observations, petrographic analysis, detrital zircon U-Pb geochronology, and Hf isotope data of one sedimentary-matrix melange unit of YZSZ in Sangsang area, central southern Tibet. This melange unit is the northernmost, and presumably the oldest one within the YZSZ accretionary complex. The sandstone matrix and blocks are rich in volcanic detritus, linking the main provenance to a juvenile magmatic arc. U-Pb-Hf analysis of detrital zircons from the sandstones reveals a unimodal age population of similar to 186-121 Ma with high positive epsilon Hf(t) values of +6.67 to +14.58, consistent with derivation from Gangdese Arc on southern margin of Lhasa terrane. The maximum depositional age of the melange unit is limited to be 149-134 Ma by averaging the youngest detrital zircon ages. The sandstones of this melange unit probably deposited in the trench basin within a few million years of early accretion driven by the Neo-Tethys oceanic subduction. The development of arc-trench system verified the initiation of subduction of Neo-Tethys oceanic lithosphere in Early Jurassic. Our results and integration of previous studies on subduction-accretion process of Neo-Tethys subduction indicate that the accretionary complex in Sangsang area documented at least two stages of accretion processes, stage 1 in earliest Cretaceous and stage 2 in Late Cretaceous, separated by a period of forearc extension forming the Yarlung Zangbo Ophiolites. These two stages of accretion correspond to growth and erosion of Gangdese Arc and crustal shortening in southern Eurasian margin.

Subject Area地质学
WOS IDWOS:000445987000025
Language英语
Indexed BySCIE
KeywordXigaze Fore-arc Zircon U-pb India-asia Collision Lhasa Terrane Implications Volcanic-rocks Neotethyan Subduction Tsangpo Suture Facies Architecture Plate Stratigraphy Tectonic Evolution
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN0040-1951
Department大陆碰撞与高原隆升重点实验室
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8523
Collection图书馆
Corresponding AuthorWang, HQ (Wang, Hou-Qi)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China;
2.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA;
3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
4.China Hua You Grp Corp, Yinchuan Co, Yinchuan 750011, Peoples R China.
Recommended Citation
GB/T 7714
Wang, HQ ,Ding, L ,Kapp, P ,et al. Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet[J]. TECTONOPHYSICS,2018,744(0):373-389.
APA Wang, HQ .,Ding, L .,Kapp, P .,Cai, FL .,Clinkscales, C .,...&Fan, SQ .(2018).Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet.TECTONOPHYSICS,744(0),373-389.
MLA Wang, HQ ,et al."Earliest Cretaceous accretion of Neo-Tethys oceanic subduction along the Yarlung Zangbo Suture Zone, Sangsang area, southern Tibet".TECTONOPHYSICS 744.0(2018):373-389.
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