Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision

dc.contributor.authorChen, Yaofei
dc.contributor.authorDing, Lin
dc.contributor.authorLi, Zhenyu
dc.contributor.authorLaskowski, Andrew K.
dc.contributor.authorLi, Jinxiang
dc.contributor.authorBaral, Upendra
dc.contributor.authorQasim, Muhammad
dc.contributor.authorYue, Yahui
dc.date.accessioned2022-06-27T19:02:28Z
dc.date.available2022-06-27T19:02:28Z
dc.date.issued2020-01
dc.description.abstractMesozoic strata along northern margin of the Lhasa terrane near Dingqing, Tibet provide a semi-continuous record of the Bangong-Nujiang Ocean closure and the subsequent Lhasa-Qiangtang collision. In this study, we present results of sandstone petrographic, detrital zircon Usingle bondPb, and Cr-spinel geochemical data to determine the provenance of the Mesozoic strata (from the Triassic Quehala Group and the Mid-Jurassic to Lower Cretaceous Xihu, Lagongtang, and Duoni Formations, which are young from ~220 Ma to ~100 Ma) in this region, thereby allowing for interpretation of their tectonic setting. The similar 1200–900 age cluster from the lower Xihu Formation to that of the Triassic Quehala Group and the distinct age peaks at ~200 Ma and ~146 Ma from the upper Xihu Formation suggest a Lhasa terrane provenance to the south. Distinctive age clusters of 300–210 Ma and ~1800 Ma and Cr-spinel composition analysis of the Lagongtang Formation indicate a provenance shift from the Lhasa terrane to the Qiangtang terrane and the Bangong-Nujiang suture zone to the north. The Lagongtang Formation was deposited in a bathyal-abyssal to shallow-slope environment from north to south, that we interpret as the foredeep depozone and distal foredeep of a peripheral foreland basin system that developed due to flexural subsidence related to the Lhasa-Qiangtang collision and terrane accretion. The age of the Lhasa-Qiangtang collision is constrained by a ~140 Ma tuffite Usingle bondPb age at the base of the foreland basin strata. An angular unconformity between the Xihu and Lagongtang Formation, which we interpret as the result of the Lhasa-Qiangtang collision. Our results indicate that the Lhasa-Qiangtang collision initiated around ~140 Ma in the Dingqing region, simultaneously with previous determinations 1200 km to the west near Gaize area. Therefore, we prefer quasi-simultaneous onset of collision along-strike to zippering collision models wherein the east collision age is older than the west.en_US
dc.identifier.citationChen, Y., Ding, L., Li, Z., Laskowski, A. K., Li, J., Baral, U., ... & Yue, Y. (2020). Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision. Tectonophysics, 775, 228311.en_US
dc.identifier.issn0040-1951
dc.identifier.urihttps://scholarworks.montana.edu/handle/1/16879
dc.language.isoenen_US
dc.publisherElsevier BVen_US
dc.rights© This manuscript version is made available under the CC-BY-NC-ND 4.0 licenseen_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.titleProvenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collisionen_US
dc.typeArticleen_US
mus.citation.extentfirstpage228311en_US
mus.citation.extentlastpage228311en_US
mus.citation.journaltitleTectonophysicsen_US
mus.citation.volume775en_US
mus.identifier.doi10.1016/j.tecto.2019.228311en_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentEarth Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US

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