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学科主题: Geochemistry & Geophysics
题名: Variations in oceanic plate bending along the Mariana trench
作者: Zhang, F ; Lin, J ; Zhan, WH
通讯作者: jlin@whoi.edu
关键词: Mariana trench ; axial vertical force ; axial bending moment ; effective elastic thickness
刊名: EARTH AND PLANETARY SCIENCE LETTERS
发表日期: 2014
卷: 401, 页:206-214
收录类别: sci
部门归属: [Zhang, Fan ; Zhan, Wenhuan] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Zhang, Fan] Univ Chinese Acad Sci, Beijing 100041, Peoples R China ; [Zhang, Fan ; Lin, Jian] Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA ; [Lin, Jian] Tongji Univ, Sch Ocean & Earth Sci, Shanghai 200092, Peoples R China
项目归属: 海洋地质
资助者: US NSF [OCE-1141985]; Deerbrook Foundation; NSFC [41376063]; Joint NSF-China/Guangdong Natural Science Fund Committee [U0933006]; Chinese Scholarship Council [201204910311]
摘要: We quantify along-trench variations in plate flexural bending along the Mariana trench in the western Pacific Ocean. A 3-D interpreted flexural deformation surface of the subducting Pacific Plate was obtained by removing from the observed bathymetry the effects of sediment loading, isostatically-compensated topography based on gravity modeling, age-related lithospheric thermal subsidence, and residual short-wavelength features. We analyzed flexural bending of 75 across-trench profile sections and calculated five best-fitting tectonic and plate parameters that control the flexural bending. Results of analysis revealed significant along-trench variations: the trench relief varies from 0.9 to 5.7 km, trench-axis vertical loading (-V-0) from (0).73 x 10(12) to 3.17 x 10(12) N/m, and axial bending moment (-M-0) from 0.1 x 10(17) to 2.7 x 10(17) N. The effective elastic plate thickness seaward of the outer-rise region (T-e(M)) ranges from 45 to 52 km, while that trench-ward of the outer-rise (T-e(m)) ranges from 19 to 40 km. This corresponds to a reduction in T-e of 21-61%. The transition from T-e(M) to T-e(m) occurs at a breaking distance of 60-125 km from the trench axis, which is near the outer-rise and corresponds to the onset of observed pervasive normal faults. The Challenger Deep area is associated with the greatest trench relief and axial vertical loading, while areas with seamounts at the trench axis are often associated with more subtle trench relief, smaller axial vertical loading, and greater topographic bulge at the outer-rise. (C) 2014 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000341218600019
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10606
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Zhang, F; Lin, J; Zhan, WH.Variations in oceanic plate bending along the Mariana trench,EARTH AND PLANETARY SCIENCE LETTERS,2014,401():206-214
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