气候变化领域集成服务门户(CCPortal): Two-dimensional finite element modeling on the crustal shortening and the surface erosion-sedimentation process across northern piedmont of the Tianshan Mountains

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DOI	10.1007/s11430-015-5135-1
	Two-dimensional finite element modeling on the crustal shortening and the surface erosion-sedimentation process across northern piedmont of the Tianshan Mountains
	Xiao Jie; Xiong Lin; He JianKun
通讯作者	Xiao, J (通讯作者)
发表日期	2015
ISSN	1674-7313
EISSN	1869-1897
起始页码	1779
结束页码	1786
卷号	58 期号:10
英文摘要	The Tianshan Mountains, located in the northwestern China, are bounded by the Tarim Basin to south and the Junggar Basin to north. In the north piedmont of this mountain range, ongoing thrusting and folding forms a set of roughly parallel anticlines. Geological observations predicted that averaged over last similar to 1 Ma time scale, the shortening rates of these anticlines are about 2.1-5.5 mm/a; However by averaged over about 10 +/- 2 kyr, their shortening rates reduce to merely about 1.25 +/- 0.5 mm/a. The slow shortening of the anticlines in the last similar to 10 +/- 2 kyr is coarsely concurrent in time with the last global deglaciation. Here, we use a two-dimensional finite element model to explore crustal deformation across north piedmont of the Tianshan Mountains under various erosion-sedimentation conditions that are assumed to represent the climate-controlled surface process. Numerical experiments show that with a relatively weak erosion-sedimentation strength, the crustal shortening is accommodated mainly by north piedmont of the Tianshan Mountains, similar to the high shortening rate of anticlines averaged over the last similar to 1 Ma. By increasing erosion-sedimentation strength, the resultant crustal shortening is transformed gradually toward the Tianshan Mountains, resulting in the shortening rate in its north piedmont being decelerated to what is observed as averaged over the last similar to 10 +/- 2 kyr. This result suggests that erosion and sedimentation could play an important role mechanically on strain localization across an intra-continent active tectonic belt. Hence, if the climate change around the last global deglaciation could be simply representative to the enhancement of surface erosion and sedimentation across the pre-existed Tianshan Mountains and its foreland, our models indicate that the observed shortening-rate variations averaged over similar to 1 Ma and similar to 10 +/- 2 kyr time scales around north piedmont of the Tianshan Mountains should be resulted from climate changes.
关键词	CHINESE TIEN-SHAN CLIMATE-CHANGE DEFORMATION UPLIFT TECTONICS EVOLUTION DYNAMICS XINJIANG FAULTS FLANK
英文关键词	crustal shortening rate; erosion-sedimentation process; climate change; finite element modeling; Tianshan Mountains
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000362336700010
来源期刊	SCIENCE CHINA-EARTH SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258427
推荐引用方式 GB/T 7714	Xiao Jie,Xiong Lin,He JianKun. Two-dimensional finite element modeling on the crustal shortening and the surface erosion-sedimentation process across northern piedmont of the Tianshan Mountains[J]. 中国科学院青藏高原研究所,2015,58(10).
APA	Xiao Jie,Xiong Lin,&He JianKun.(2015).Two-dimensional finite element modeling on the crustal shortening and the surface erosion-sedimentation process across northern piedmont of the Tianshan Mountains.SCIENCE CHINA-EARTH SCIENCES,58(10).
MLA	Xiao Jie,et al."Two-dimensional finite element modeling on the crustal shortening and the surface erosion-sedimentation process across northern piedmont of the Tianshan Mountains".SCIENCE CHINA-EARTH SCIENCES 58.10(2015).