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Edge-driven convection and thinning of craton lithosphere: Two-dimensional thermal-mechanical modeling

文献类型：期刊论文

作者Liu, Danhong1,2; Chen, Lin1
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2019-12-01
卷号62期号:12页码:2106-2120
关键词Edge-driven convection Lithospheric steps Lithospheric thinning Numerical modeling Craton
ISSN号1674-7313
DOI10.1007/s11430-019-9371-0
英文摘要There are usually abrupt changes in lithospheric thickness at the boundaries between ancient cratons and adjacent young mobile belts. Lateral variations in temperature and density between the two can trigger small-scale mantle convection (edge-driven convection, EDC). Here, we use two-dimensional thermal-mechanical simulations to explore the EDC caused by the lithospheric step between a craton and a mobile belt, and its role in the thinning of the craton lithosphere. The results show that the impact of EDC on a craton depends on the properties of the craton lithosphere and on their contrasts with the adjacent mobile belt, given the same initial condition. When the craton lithospheric density is relatively large, a high-strength craton has strong ability to resist EDC, and craton lithospheric thinning is limited to the edge. In contrast, the ability of a low-strength craton to resist EDC is weak, and the craton lithosphere is gradually eroded by the downward flow, eventually leading to large-scale thinning of the cratonic lithosphere. When the craton lithospheric density is relatively small, regardless of the strength of the cratonic lithosphere, the craton can well withstand the impacts of EDC. In this case, upwelling flow drives cratonic lithosphere materials to the base of the mobile belt, and lithospheric thinning only occurs at the edge of the craton lithosphere. The Archean North China Craton (NCC) was surrounded by Phanerozoic mobile belts, and its lithospheric thinning first occurred on the northern and eastern margins, a process that lasted for a long time. We suggest that EDC has played an important role in lithospheric thinning of the NCC, in particular the initiation of lithospheric thinning, but we cannot rule out the additional contributions from other mechanisms.
WOS关键词NORTH CHINA CRATON ; COLLISIONAL OROGENS ; DESTRUCTION ; MANTLE ; BENEATH ; SUBDUCTION ; DYNAMICS ; DELAMINATION ; LONGEVITY ; ACCRETION
资助项目National Key Research and Development of China[2016YFC0600406] ; Chinese Academy of Sciences[XDB18000000]
WOS研究方向Geology
语种英语
WOS记录号WOS:000509534600017
出版者SCIENCE PRESS
资助机构National Key Research and Development of China ; National Key Research and Development of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Key Research and Development of China ; National Key Research and Development of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Key Research and Development of China ; National Key Research and Development of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Key Research and Development of China ; National Key Research and Development of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/95597]  
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Chen, Lin
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Danhong,Chen, Lin. Edge-driven convection and thinning of craton lithosphere: Two-dimensional thermal-mechanical modeling[J]. SCIENCE CHINA-EARTH SCIENCES,2019,62(12):2106-2120.
APA Liu, Danhong,&Chen, Lin.(2019).Edge-driven convection and thinning of craton lithosphere: Two-dimensional thermal-mechanical modeling.SCIENCE CHINA-EARTH SCIENCES,62(12),2106-2120.
MLA Liu, Danhong,et al."Edge-driven convection and thinning of craton lithosphere: Two-dimensional thermal-mechanical modeling".SCIENCE CHINA-EARTH SCIENCES 62.12(2019):2106-2120.

入库方式： OAI收割

来源：地质与地球物理研究所

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