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New Insights into the Late Triassic Nadigangri Formation of Northern Qiangtang, Tibet, China: Constraints from U-Pb Ages and Hf Isotopes of Detrital and Magmatic Zircons

New Insights into the Late Triassic Nadigangri Formation of Northern Qiangtang, Tibet, China: Constraints from U-Pb Ages and Hf Isotopes of Detrital and Magmatic Zircons

作     者:LI Xueren WANG Jian CHENG Leli FU Xiugen WANG Yuke 

作者机构:Chinese Academy of Geological Sciences Beijing 100037 China China University of Geosciences (Beijing) Beijing 100083 China Key Laboratory for Sedimentary Basin and Oil and Gas Resources Ministry of Land and Resources Chengdu Sichuan 610081 China Chengdu Center of China Geological Survey Chengdu Sichuan 610081 China Institute of Mud Logging Technology and Engineering Yangtze University Jingzhou Hubei 434023 China 

出 版 物:《Acta Geologica Sinica(English Edition)》 (地质学报(英文版))

年 卷 期:2018年第92卷第4期

页      面:1451-1467页

核心收录:

学科分类:070902[理学-地球化学] 070903[理学-古生物学与地层学(含:古人类学)] 0709[理学-地质学] 07[理学] 

基  金:funded by the National Natural Science Foundation of China(Grant No.41502112 and 41702119) a project program under China Geological Survey(No.DD20160159) 

主  题:U-Pb ages Hf isotope Nadigangri Formation Late Triassic Qiangtang 

摘      要:We report here U-Pb age and in situ Hf isotopic results for detrital and magmatic zircons from one conglomerate and four tuffite samples from the Late Triassic Nadigangri Formation across the North Qiangtang depression, Tibet. Coupled with previously published data in the region, this paper proposes new insights into the geochronological framework for the Nadigangri Formation. The deposition ages of tuffite from top to bottom in the Woruo Mountain, Quem Co and Dongqu River, are 203 Ma, 226 Ma, 221.5 Ma and 221.1 Ma, respectively. The detrital zircons yield a younger cluster of ages of 201.5-225 Ma from the conglomerate of the Quem Co Formation. The Late Triassic Nadigangri Formation defines a temporal range approximately between 201 and 225 Ma (Norian-Rhaetian), including three predominant groups of 220-225 Ma, 210-217 Ma and 201-205 Ma, which correspond with the three main rifting episodes of initial rifting, further rifting and final rifting. Positive ~Hf(t) value and low model ages in younger detrital zircons suggests a juvenile character. However, the Hf isotopes of magmatic zircons display the presence of reworked ancient crust with 1.1-1.8 Ga. These results provide strong constraints not only on the temporal range of the Late Triassic Nadigangri Formation, but also on the onset of the Qiangtang Mesozoic rift basin.

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