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学科主题: 地球科学::地质学
题名: Thermo-mechanical controls of flat subduction: Insights from numerical modeling
作者: Huangfu, PP (Huangfu, Pengpeng)1, 2; Wang, YJ (Wang, Yuejun)1, 3; Cawood, PA (Cawood, Peter A.)4, 5; Li, ZH (Li, Zhong-Hai)2; Fan, WM (Fan, Weiming)3; Gerya, TV (Gerya, Taras V.)6
通讯作者: Wang, YJ
关键词: LOW-ANGLE SUBDUCTION ; CONTINENTAL SUBDUCTION ; THERMAL STRUCTURE ; MANTLE FLOW ; HORIZONTAL SUBDUCTION ; OCEANIC PLATEAUS ; RIDGE SUBDUCTION ; OVERRIDING PLATE ; COCOS RIDGE ; COSTA-RICA
刊名: GONDWANA RESEARCH
发表日期: 2016
DOI: 10.1016/j.gr.2016.08.012
卷: 40, 期:0, 页:170-183
收录类别: SCI
合作性质: 国际
文章类型: Article
英文摘要: Numerical experiments are used to investigate the thermo-mechanical controls for inducing flat subduction and why flat subduction is rare relative to normal/steep subduction. Our modeling results demonstrate that flat subduction is an end-member of a steady state subduction geometry and is characterized by a curved slab with a nearly-horizontal slab section. Intermediate cases between normal/steep and flat subduction appear to be transient in origin and evolve toward one of the stable end-members. Physical parameters inducing flat subduction can be classified into four categories: buoyancy of the subducting oceanic lithosphere (e.g., slab age, oceanic crustal thickness), viscous coupling between the overriding and downgoing plates (e.g., initial subduction angle), external kinematic conditions, and rheological properties of the subduction zone. On the basis of parameter sensitivity tests and the main characteristics of present-day flat subduction zones, positive buoyancy from either the young slab or the thickened oceanic crust is considered as the primary controlling parameter. Our results show that the possibility of flat subduction is directly proportional to oceanic crustal thickness and inversely proportional to the slab age. Furthermore, oceanic crust must be thicker than 8 km to induce flat subduction, when the slab is older than 30 Ma with an initial subduction angle of <= 20 degrees and without absolute trenchward motion of the overriding plate. The lower the initial subduction angle or the thicker the overriding continental lithosphere, the more likelihood for flat subduction. The initial subduction angle is more influential for the development of flat subduction than the overriding lithospheric thickness, and a thick overriding lithosphere induces flat subduction only under the condition of an initial subduction angle of <= 25 degrees, with a slab age of >= 30 Ma and without absolute trenchward motion of the overriding plate. However, when the initial subduction angle is increased to >25 degrees, no flat subduction is predicted. All the parameters are evaluated within the constraints of a mechanical framework in which the slab geometry is regarded as a result of a balance between the gravitational and hydrodynamic torques. Any factor that can sufficiently reduce gravitational torque or increase hydrodynamic torque will exert a strong effect on flat subduction development. Our results are consistent with the observations of modern flat subduction zones on Earth. (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000397873100010
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7475
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Univ St Andrews, Dept Earth Sci, North St, St Andrews KY16 9AL, Fife, Scotland
5.Univ Western Australia, Sch Earth & Environm, Ctr Explorat Targeting, 35 Stirling Highway, Crawley, WA 6009, Australia
6.Swiss Fed Inst Technol, Dept Earth Sci, Inst Geophys, CH-8092 Zurich, Switzerland

Recommended Citation:
Huangfu, PP ,Wang, YJ ,Cawood, PA ,et al. Thermo-mechanical controls of flat subduction: Insights from numerical modeling[J]. GONDWANA RESEARCH,2016,40(0):170-183.
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