气候变化领域集成服务门户(CCPortal): Late Paleozoic Exhumation of the West Junggar Mountains, NW China

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DOI	10.1029/2019JB018013
	Late Paleozoic Exhumation of the West Junggar Mountains, NW China
	Gillespie J.; Glorie S.; Jepson G.; Xiao W.; Collins A.S.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	The Tianshan and Altai mountain belts dominate the present-day topography of central Asia and are major constituents of the Central Asian Orogenic Belt. These mountain belts have been extensively studied using low-temperature thermochronology to understand their uplift and exhumation history. In comparison, few studies have focused on the spatial extent and timing of intracontinental deformation in the intervening ranges, such as the West Junggar Mountains. Apatite fission track (AFT) and apatite U-Pb dating of igneous samples from the West Junggar Mountains reveals AFT central ages ranging from latest Carboniferous to Middle Jurassic and mean confined track lengths between 14.1 and 12.0 µm, which are negatively correlating to AFT central ages. Apatite U-Pb dating produced mid-Carboniferous-early Permian ages within uncertainty of zircon U-Pb crystallization ages, indicating cooling to below ∼450–550 °C immediately following emplacement. Thermal history modeling of our AFT data combined with published (U-Th)/He data predicts rapid cooling to <60 °C during the early-middle Permian (285–260 Ma), followed by slower cooling rates during the Mesozoic-Cenozoic. The rapid cooling event coincides with (1) the timing of major basinward thrusting in the Junggar Basin adjacent to the study area and (2) exhumation in the Chinese Altai to the north. In contrast to previous studies, our results imply that the West Junggar Mountains do not record significant exhumation during the Mesozoic-Cenozoic. This suggests that Mesozoic deformation of the Central Asian Orogenic Belt was less pervasive and widespread than previously assumed. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	apatite; central Asia; exhumation; intracontinental; Junggar; thermochronology
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/188022
作者单位	Department of Earth Sciences, School of Physical Science, University of Adelaide, Adelaide, SA, Australia; The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, Perth, WA, Australia; Department of Geoscience, University of Arizona, Tucson, AZ, United States; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing, China; Xinjiang Research Centre for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, China
推荐引用方式 GB/T 7714	Gillespie J.,Glorie S.,Jepson G.,et al. Late Paleozoic Exhumation of the West Junggar Mountains, NW China[J],2020,125(1).
APA	Gillespie J.,Glorie S.,Jepson G.,Xiao W.,&Collins A.S..(2020).Late Paleozoic Exhumation of the West Junggar Mountains, NW China.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Gillespie J.,et al."Late Paleozoic Exhumation of the West Junggar Mountains, NW China".Journal of Geophysical Research: Solid Earth 125.1(2020).