Variations in oceanic plate bending along the Mariana trench

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	Variations in oceanic plate bending along the Mariana trench
	Zhang, F ; Lin, J ; Zhan, WH
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2014
卷号	401 页码:206-214
关键词	Mariana trench axial vertical force axial bending moment effective elastic thickness
ISSN号	0012-821X
通讯作者	jlin@whoi.edu
中文摘要	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.
学科主题	Geochemistry & Geophysics
收录类别	SCI
资助信息	US NSF [OCE-1141985]; Deerbrook Foundation; NSFC [41376063]; Joint NSF-China/Guangdong Natural Science Fund Committee [U0933006]; Chinese Scholarship Council [201204910311]
原文出处	ELSEVIER SCIENCE BV
WOS记录号	WOS:000341218600019
公开日期	2014-12-11
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10606]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Zhang, F,Lin, J,Zhan, WH. Variations in oceanic plate bending along the Mariana trench[J]. EARTH AND PLANETARY SCIENCE LETTERS,2014,401:206-214.
APA	Zhang, F,Lin, J,&Zhan, WH.(2014).Variations in oceanic plate bending along the Mariana trench.EARTH AND PLANETARY SCIENCE LETTERS,401,206-214.
MLA	Zhang, F,et al."Variations in oceanic plate bending along the Mariana trench".EARTH AND PLANETARY SCIENCE LETTERS 401(2014):206-214.