Tectono-thermal evolution of the southwestern Alxa Tectonic Belt, NW China: Constrained by apatite U-Pb and fission track thermochronology

doi:10.1016/j.tecto.2017.11.029

	Tectono-thermal evolution of the southwestern Alxa Tectonic Belt, NW China: Constrained by apatite U-Pb and fission track thermochronology
	Song, Dongfang 1,2,3; Glorie, Stijn 3; Xiao, Wenjiao 1,2,4,5; Collins, Man S.3; Gillespie, Jack 3; Jepson, Gilby 3; Li, Yongchen 1,2
刊名	TECTONOPHYSICS
	2018-01-02
卷号	722 页码:577-594
关键词	Alxa Central Asia Apatite U-Pb Apatite fission track Thermochronology
ISSN号	0040-1951
DOI	10.1016/j.tecto.2017.11.029
文献子类	Article
英文摘要	The Central Asian Orogenic Belt (CAOB) is regarded to have undergone multiple phases of intracontinental deformation during the Meso-Cenozoic. Located in a key position along the southern CAOB, the Alxa Tectonic Belt (ATB) connects the northernmost Tibetan Plateau with the Mongolian Plateau. In this paper we apply apatite U-Pb and fission track thermochronological studies on varieties of samples from the southwestern ATB, in order to constrain its thermal evolution. Precambrian bedrock samples yield late Ordovician-early Silurian (similar to 430-450 Ma) and late Permian (similar to 257 Ma) apatite U-Pb ages; the late Paleozoic magmatic-sedimentary samples yield relatively consistent early Permian ages from similar to 276 to 290 Ma. These data reveal that the ATB experienced multiple Paleozoic tectono-thermal events, as the samples passed through the apatite U-Pb closure temperature (similar to 350-550 degrees C). We interpret these tectonic events to record the long-lived subduction-accretion processes of the Paleo-Asian Ocean during the formation of the southern CAOB, with possible thermal influence of the Permian Tarim mantle plume. Apatite fission track (AFT) data and thermal history modelling reveal discrete low-temperature thermal events for the ATB, inducing cooling/reheating through the AFT partial annealing zone (similar to 120-60 degrees C). During the Permian, the samples underwent rapid cooling via exhumation or denudation from deep crustal levels to temperatures < 200 degrees C. Subsequent thermal events in the Triassic were thought to be associated with the final amalgamation of the CAOB or the closure of the Paleotethys. During the Jurassic-Cretaceous the study area experienced heating by burial, followed by renewed cooling, which may be related with the construction and subsequent collapse of the Mongol-Okhotsk Orogeny, or the Lhasa-Eurasia collision and subsequent slab break-off. These results indicate that the ATB may have been stable after late Cretaceous in contrast to the Qilian Shan and Tianshan. Finally, our results indicate differential exhumation scenario occurred across the southwestern ATB during the Cretaceous.
WOS关键词	ASIAN OROGENIC BELT ; LOW-TEMPERATURE THERMOCHRONOLOGY ; NORTHERN QILIAN SHAN ; TIEN-SHAN ; INNER-MONGOLIA ; ICP-MS ; TIBETAN PLATEAU ; INTRACONTINENTAL DEFORMATION ; NORTHEASTERN MARGIN ; SOLONKER SUTURE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000426022800039
资助机构	National Key R&D Program of China(2017YFC0601206) ; National Key R&D Program of China(2017YFC0601206) ; National Key R&D Program of China(2017YFC0601206) ; National Key R&D Program of China(2017YFC0601206) ; National Key R&D Program of China(2017YFC0601206) ; National Key R&D Program of China(2017YFC0601206) ; National Key R&D Program of China(2017YFC0601206) ; National Key R&D Program of China(2017YFC0601206) ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(QYZDJ-SSW-SYS012) ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(QYZDJ-SSW-SYS012) ; 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内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82800]
专题	中国科学院地质与地球物理研究所
通讯作者	Song, Dongfang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Adelaide, Ctr Tecton Resources & Explorat TRaX, Dept Earth Sci, Adelaide, SA 5005, Australia 4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100029, Peoples R China 5.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
推荐引用方式 GB/T 7714	Song, Dongfang,Glorie, Stijn,Xiao, Wenjiao,et al. Tectono-thermal evolution of the southwestern Alxa Tectonic Belt, NW China: Constrained by apatite U-Pb and fission track thermochronology[J]. TECTONOPHYSICS,2018,722:577-594.
APA	Song, Dongfang.,Glorie, Stijn.,Xiao, Wenjiao.,Collins, Man S..,Gillespie, Jack.,...&Li, Yongchen.(2018).Tectono-thermal evolution of the southwestern Alxa Tectonic Belt, NW China: Constrained by apatite U-Pb and fission track thermochronology.TECTONOPHYSICS,722,577-594.
MLA	Song, Dongfang,et al."Tectono-thermal evolution of the southwestern Alxa Tectonic Belt, NW China: Constrained by apatite U-Pb and fission track thermochronology".TECTONOPHYSICS 722(2018):577-594.