Late Triassic tectonic inversion in the upper Yangtze Block: Insights from detrital zircon U-Pb geochronology from south-western Sichuan Basin

被引:27
作者
Yan, Zhaokun [1 ,3 ,4 ]
Tian, Yuntao [2 ]
Li, Rui [2 ]
Vermeesch, Pieter [4 ]
Sun, Xilin [2 ]
Li, Yong [1 ]
Rittner, Martin [4 ]
Carter, Andrew [5 ]
Shao, Chongjian [1 ]
Huang, Hu [1 ]
Ji, Xiangtian [1 ]
机构
[1] Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu, Sichuan, Peoples R China
[2] Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou, Guangdong, Peoples R China
[3] Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing, Jiangsu, Peoples R China
[4] UCL, Dept Earth Sci, London, England
[5] Birkbeck Univ London, Dept Earth & Planetary Sci, London, England
基金
中国国家自然科学基金;
关键词
EASTERN TIBETAN PLATEAU; GARZE FOLD BELT; SONGPAN-GANZI COMPLEX; SHAN FORELAND BASIN; LU-HF ISOTOPES; SW CHINA; PROVENANCE ANALYSIS; SEDIMENTARY RECORD; JURASSIC DEPOSITS; CRUSTAL EVOLUTION;
D O I
10.1111/bre.12310
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Sichuan Basin and the Songpan-Ganze terrane, separated by the Longmen Shan fold-and-thrust belt (the eastern margin of the Tibetan Plateau), are two main Triassic depositional centres, south of the Qinling-Dabie orogen. During the Middle-Late Triassic closure of the Paleo-Tethys Ocean, the Sichuan Basin region, located at the western margin of the Yangtze Block, transitioned from a passive continental margin into a foreland basin. In the meantime, the Songpan-Granze terrane evolved from a marine turbidite basin into a fold-and-thrust belt. To understand if and how the regional sediment routing system adjusted to these tectonic changes, we monitored sediment provenance primarily by using detrital zircon U-Pb analyses of representative stratigraphic samples from the south-western edge of the Sichuan Basin. Integration of the results with paleocurrent, sandstone petrology and published detrital zircon data from other parts of the basin identified a marked change in provenance. Early-Middle Triassic samples were dominated by Neoproterozoic (similar to 700-900 Ma) zircons sourced mainly from the northern Kangdian basement, whereas Late Triassic sandstones that contain a more diverse range of zircon ages sourced from the Qinling, Longmen Shan and Songpan-Ganze terrane. This change reflects a major drainage adjustment in response to the Late Triassic closure of the Paleo-Tethys Ocean and significant shortening in the Longmen Shan thrust belt and the eastern Songpan-Ganze terrane. Furthermore, by Late Triassic time, the uplifted northern Kangdian basement had subsided. Considering the eastward paleocurrent and depocenter geometry of the Upper Triassic deposits, subsidence of the northern Kangdian basement probably resulted from eastward shortening and loading of the Songpan-Ganze terrane over the western margin of the Yangtze Block in response to the Late Triassic collision among Yangtze Block, Yidun arc and Qiangtang terrane along the Ganze-Litang and Jinshajiang sutures.
引用
收藏
页码:92 / 113
页数:22
相关论文
共 134 条
  • [1] [Anonymous], 2001, Geochimica
  • [2] BGMRSC, 1991, REG GEOL SICH PROV, P1
  • [3] Burchfiel B.C., 1995, INT GEOL REV, V37, P661, DOI [DOI 10.1080/00206819509465424, 10.1080/00206819509465424]
  • [4] Bureau of Geology and Mineral Resources Sichuan Provence (BGMRSP), 1997, MULT CLASS CORR STRA, P1
  • [5] Bureau of Geology Sichuan Provence (BGSP), 1974, BUR GEOL MIN RES SIC, P1
  • [6] High-precision timeline for Earth's most severe extinction
    Burgess, Seth D.
    Bowring, Samuel
    Shen, Shu-zhong
    [J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2014, 111 (09) : 3316 - 3321
  • [7] Geology and tectonics of the Songpan-Ganzi fold belt, southwestern China
    Chang, EZ
    [J]. INTERNATIONAL GEOLOGY REVIEW, 2000, 42 (09) : 813 - 831
  • [8] Chen HD, 2011, ACTA PETROL SIN, V27, P2281
  • [9] U-Pb ages and Hf isotopic record of zircons from the late Neoproterozoic and Silurian-Devonian sedimentary rocks of the western Yangtze Block: Implications for its tectonic evolution and continental affinity
    Chen, Qiong
    Sun, Min
    Long, Xiaoping
    Zhao, Guochun
    Yuan, Chao
    [J]. GONDWANA RESEARCH, 2016, 31 : 184 - 199
  • [10] CHEN Z, 1987, TECTONIC EVOLUTION W