A re-evaluation of the Meso-Cenozoic thermo-tectonic evolution of Bogda Shan (Tian Shan, NW China) based on new basement and detrital apatite fission track thermochronology
Bogda Shan is a mountain belt located at the eastern extremity of the Chinese Tianshan and records a complex and debated exhumation history. Previous studies have reported a young Cenozoic thermal history for the exhumation of Bogda Shan, which is in conflict with the observation of preserved Mesozoic erosion surfaces in the area. This study re-evaluates the Meso-Cenozoic thermo-tectonic evolution of Bogda Shan using apatite fission track (AFT) thermochronology. Palaeozoic basement (meta-sandstone) samples collected from the northern and southwestern flanks of the mountain ranges reveal apparent Mesozoic AFT ages ranging from similar to 202 Ma to similar to 97 Ma. Inverse thermal history modelling results reveal slow to moderate basement cooling during the early Mesozoic, corresponding to relatively low levels of exhumation. This accounts for the preservation of low-relief Mesozoic peneplanation surfaces recognized at elevations of similar to 3500-4000 m. None of the presented AFT data and thermal history models show any evidence for significant deep Cenozoic exhumation. In the neighbouring Junggar Basin, a Middle Jurassic sandstone sample records partial resetting of the AFT system during the Cretaceous. This observation conflicts with previous data (from the same Jurassic strata) where complete resetting of the AFT clock during the Cenozoic was suggested. Furthermore, Lower Cretaceous and Palaeogene sediments from the Turpan-Hami Basin show non-reset detrital AFT age populations of similar to 197, similar to 135, and similar to 104 Ma, which are coincident with the main pulses of exhumation recorded in the Chinese North Tianshan. Based on a comprehensive summary of the published data, we argue for a Mesozoic building of the Bogda-Balikun-Harlik mountain chain in the eastern Chinese Tianshan. Subsequent Cenozoic exhumation must have been relatively modest at most (<2 km) as it was not recorded by AFT thermochronology.
机构:
Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Xiang, Dunfeng
Zhang, Zhiyong
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Univ Melbourne, Sch Earth Sci, Melbourne, Vic 3010, AustraliaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Zhang, Zhiyong
Xiao, Wenjiao
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Xiao, Wenjiao
Zhu, Wenbin
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Nanjing Univ, Dept Earth Sci, State Key Lab Mineral Deposits Res, Nanjing 210093, Jiangsu, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Zhu, Wenbin
Zheng, Dewen
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China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Zheng, Dewen
Li, Guangwei
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Univ Melbourne, Sch Earth Sci, Melbourne, Vic 3010, AustraliaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Li, Guangwei
Zheng, Bihai
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Nanjing Univ, Dept Earth Sci, State Key Lab Mineral Deposits Res, Nanjing 210093, Jiangsu, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Zheng, Bihai
Song, Dongfang
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Song, Dongfang
Han, Chunming
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Han, Chunming
Pang, Jianzhang
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China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
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SRK Explorat, Moscow, RussiaUniv Adelaide, Dept Earth Sci, Sch Phys Sci, Adelaide, SA 5005, Australia
Gurevich, D.
Zhang, Z.
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R ChinaUniv Adelaide, Dept Earth Sci, Sch Phys Sci, Adelaide, SA 5005, Australia
Zhang, Z.
Song, D.
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R ChinaUniv Adelaide, Dept Earth Sci, Sch Phys Sci, Adelaide, SA 5005, Australia
Song, D.
Xiao, W.
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Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R ChinaUniv Adelaide, Dept Earth Sci, Sch Phys Sci, Adelaide, SA 5005, Australia
机构:
Sobolev Institute of Geology and Mineralogy,Siberian Branch of the Russian Academy of SciencesDepartment of Earth Sciences,School of Physical SciencesThe University of Adelaide
FIZhimulev
DGurevich
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SRK ExplorationMoscowDepartment of Earth Sciences,School of Physical SciencesThe University of Adelaide
DGurevich
ZZhang
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State Key Laboratory of Lithospheric Evolution,Institute of Geology and GeophysicsChinese Academy of SciencesDepartment of Earth Sciences,School of Physical SciencesThe University of Adelaide
ZZhang
DSong
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State Key Laboratory of Lithospheric Evolution,Institute of Geology and GeophysicsChinese Academy of SciencesDepartment of Earth Sciences,School of Physical SciencesThe University of Adelaide
DSong
WXiao
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State Key Laboratory of Lithospheric Evolution,Institute of Geology and GeophysicsChinese Academy of Sciences
Xinjiang Research Centre for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy ofDepartment of Earth Sciences,School of Physical SciencesThe University of Adelaide