气候变化领域集成服务门户(CCPortal): Mesozoic-Cenozoic cooling, exhumation and tectonic implications of Chaqiabeishan-Shaliuquan Li-Be ore district in the northeastern Qinghai-Tibet Plateau

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DOI	10.1016/j.tecto.2023.230040
	Mesozoic-Cenozoic cooling, exhumation and tectonic implications of Chaqiabeishan-Shaliuquan Li-Be ore district in the northeastern Qinghai-Tibet Plateau
	Feng, Zirui; Yuan, Wanming; Zhao, Zhidan; Dong, Guochen; Li, Xiaowei; Sun, Wenli; Yang, Li; Hong, Shujiong; Zhao, Mingming; Hu, Caixia; Li, Shiyu
发表日期	2023
ISSN	0040-1951
EISSN	1879-3266
卷号	866
英文摘要	The Mesozoic-Cenozoic exhumation and deformation of the northeastern Qinghai-Tibetan Plateau generated extensive regional rugged mountains. We aimed to explore the prolonged kinematic evolutionary history since the Mesozoic. We collected Mesozoic magmatic rock samples from the Chaqiabeishan-Shaliuquan lithium-beryllium ore district in the Northern Qaidam tectonic belt (NQTB) to constrain the cooling exhumation history using apatite fission track (AFT) thermochronology. Twenty samples yielded AFT ages from 111 to 11 Ma, including four age groups:111-103, 89-75, 71-47, and 30-11 Ma, with mean track lengths of 12.5-11.2 mu m. Four thermal history phases of 120-90, 90-50, 50-20, and 20-0 Ma were established based on the inverse thermal model and isostatic adjustment of the lithosphere. Additionally, the average cooling rates of the four phases were 1.67 +/- 0.17, 1.25 +/- 0.13, 0.33, and 1.75 +/- 0.5 degrees C/Myr, with a corresponding exhumation amount of 1.15 +/- 0.07 km, 0.98 +/- 0.06 km, 0.86 +/- 0.05 km, and 1.09 +/- 0.06 km respectively, and the maximum exhumation was 6.021-6.787 km since 120 Ma. In the first phase, the far-field effects of Mid-Tethys Ocean subduction and closure drove the rapid exhumation of the research area. The closure of the Neo-Tethys Oceans and the continuing collision of the India-Asia plate disturbed the northeastern plateau, inducing regional backlash fault events in the NQTB, demonstrated in the second phase of thermal history. The third phase of the stable tectonic setting is consistent with previous research results, suggesting a similar cooling history for the NQTB and Qilian Mountains, evidenced by the widespread absence of Eocene to Miocene cooling signals. The rapid exhumation and reactivation of the NQTB and Qilian thrust fault system since 20 Ma represents the final stage of growth and expansion of the northeastern Qinghai-Tibet Plateau.
关键词	Exhumation Tectonic Fission track North Qaidam Basin
英文关键词	APATITE FISSION-TRACK; NORTHERN QILIAN SHAN; EASTERN KUNLUN RANGE; QAIDAM BASIN IMPLICATIONS; NORTHWARD GROWTH; NW CHINA; CONTINENTAL DEFORMATION; GEOLOGIC EVOLUTION; HEXI CORRIDOR; OROGENIC BELT
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001091834400001
来源期刊	TECTONOPHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283326
作者单位	China University of Geosciences - Beijing; China University of Geosciences - Beijing; China University of Geosciences - Beijing
推荐引用方式 GB/T 7714	Feng, Zirui,Yuan, Wanming,Zhao, Zhidan,et al. Mesozoic-Cenozoic cooling, exhumation and tectonic implications of Chaqiabeishan-Shaliuquan Li-Be ore district in the northeastern Qinghai-Tibet Plateau[J],2023,866.
APA	Feng, Zirui.,Yuan, Wanming.,Zhao, Zhidan.,Dong, Guochen.,Li, Xiaowei.,...&Li, Shiyu.(2023).Mesozoic-Cenozoic cooling, exhumation and tectonic implications of Chaqiabeishan-Shaliuquan Li-Be ore district in the northeastern Qinghai-Tibet Plateau.TECTONOPHYSICS,866.
MLA	Feng, Zirui,et al."Mesozoic-Cenozoic cooling, exhumation and tectonic implications of Chaqiabeishan-Shaliuquan Li-Be ore district in the northeastern Qinghai-Tibet Plateau".TECTONOPHYSICS 866(2023).