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  4. 岩石圈演化国家重点实验室
Buchan-type metamorphic decarbonation during the upward expansion of the South Tibetan Detachment System: A new carbon source in the Himalaya

文献类型：期刊论文

作者Wang, Jia-Min2; Larson, Kyle Patrick3; Zhang, Jin-Jiang1; Zhao, Liang2; Wu, Fu-Yuan2
刊名LITHOS
出版日期2024
卷号464页码:20
关键词Continental collision Himalaya South Tibetan Detachment System Buchan-type metamorphism Calc-silicates Deep Carbon Cycle
ISSN号0024-4937
DOI10.1016/j.lithos.2023.107428
英文摘要The role of collisional belts in the global carbon budget remains controversial. Collisional orogens have traditionally been considered a net carbon sink, but recent studies have highlighted significant CO2 fluxes. The present contribution combines comprehensive field mapping with detailed petrography, pressure-temperature determination, geochemistry, and geochronology along three transects of the South Tibetan Detachment System (STDS) in the Mount Everest and Nyalam regions of the central Himalaya. The results outline a previously unrecognized carbon source in the orogen: Buchan-type metamorphic decarbonation of carbonate-bearing lithologies in the hanging wall of the STDS driven by juxtaposition against underlying migmatite. Specifically, calc-silicates and calc-schists within the STDS underwent Buchan-type metamorphic overprinting at P-T conditions of 630-400 degrees C and 5-3 kbar (36-48 degrees C/km). Monazite and titanite U(-Th)-Pb petrochronology indicate that metamorphism occurred between ca. 23 and 19 Ma, contemporaneous with early deformation along the STDS. Movement along the STDS continued to at least 17-16 Ma, causing deformation and resetting of titanite U-Pb systematics in some calc-silicates. Detrital zircon geochronology shows that the calc-silicates and calc-schists in the STDS have an affinity to the Tethyan Himalayan Sequence and were incorporated into the shear zone and metamorphosed during its upward expansion. Based on decarbonation reactions, protolith restoration, and decarbonation efficiency studies, the metamorphic CO2 degassing from the metamorphism of carbonate-rich rocks is estimated to be -0.6 Mt. C/yr. Recognition of the upward expansion of the STDS and associated metamorphic decarbonation provided new information key to both understanding the development of orogenscale low-angle normal-sense faulting in the Himalaya and whether the orogen was a net CO2 source or sink during middle Miocene time.
WOS关键词CALC-SILICATE ROCKS ; EVEREST REGION ; CENTRAL NEPAL ; TECTONOMETAMORPHIC DISCONTINUITIES ; TETHYAN HIMALAYA ; CO2 PRODUCTION ; CONSTRAINTS ; EVOLUTION ; GEOCHRONOLOGY ; TEMPERATURE
资助项目National Natural Science Foundation of China[41888101] ; National Key R & D Program of China[2022YFF0800800] ; Second Tibetan Plateau Scientific Expedition and Research program[2019QZKK0703] ; State Key Laboratory of Lithospheric Evolution[SKL-Z202102] ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences[IGGCAS-202201] ; Institute of Geology and Geophysics Chinese Academy of Sciences ; [2022065]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:001125553200001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R & D Program of China ; National Key R & D Program of China ; National Key R & D Program of China ; National Key R & D Program of China ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R & D Program of China ; National Key R & D Program of China ; National Key R & D Program of China ; National Key R & D Program of China ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R & D Program of China ; National Key R & D Program of China ; National Key R & D Program of China ; National Key R & D Program of China ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R & D Program of China ; National Key R & D Program of China ; National Key R & D Program of China ; National Key R & D Program of China ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; Second Tibetan Plateau Scientific Expedition and Research program ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Youth Innovation Promotion Association Membership Project of the Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences ; Institute of Geology and Geophysics Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/111672]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wang, Jia-Min
作者单位1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ British Columbia Okanagan, Earth & Environm Sci, Kelowna, BC V1V 1V7, Canada
推荐引用方式
GB/T 7714		 Wang, Jia-Min,Larson, Kyle Patrick,Zhang, Jin-Jiang,et al. Buchan-type metamorphic decarbonation during the upward expansion of the South Tibetan Detachment System: A new carbon source in the Himalaya[J]. LITHOS,2024,464:20.
APA Wang, Jia-Min,Larson, Kyle Patrick,Zhang, Jin-Jiang,Zhao, Liang,&Wu, Fu-Yuan.(2024).Buchan-type metamorphic decarbonation during the upward expansion of the South Tibetan Detachment System: A new carbon source in the Himalaya.LITHOS,464,20.
MLA Wang, Jia-Min,et al."Buchan-type metamorphic decarbonation during the upward expansion of the South Tibetan Detachment System: A new carbon source in the Himalaya".LITHOS 464(2024):20.

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来源：地质与地球物理研究所

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