DOI: 10.1002/2015GL064985
论文题名: Subduction initiation at relic arcs
作者: Leng W. ; Gurnis M.
刊名: Geophysical Research Letters
ISSN: 0094-9447
EISSN: 1944-9178
出版年: 2015
卷: 42, 期: 17 起始页码: 7014
结束页码: 7021
语种: 英语
英文关键词: passive margin
; relic arc
; spontaneous
; subduction initiation
Scopus关键词: Geodynamics
; Transform faults
; Computational model
; Geodynamic modeling
; passive margin
; Plate reconstruction
; relic arc
; spontaneous
; Subduction initiation
; Thermal rejuvenation
; Tectonics
; buoyancy
; computer simulation
; fault displacement
; plate boundary
; plate tectonics
; subduction
; Izu-Bonin Arc
; Pacific Ocean
英文摘要: Although plate tectonics is well established, how a new subduction zone initiates remains controversial. Based on plate reconstruction and recent ocean drilling within the Izu-Bonin-Mariana, we advance a new geodynamic model of subduction initiation (SI). We argue that the close juxtaposition of the nascent plate boundary with relic oceanic arcs is a key factor localizing initiation of this new subduction zone. The combination of thermal and compositional density contrasts between the overriding relic arc, and the adjacent old Pacific oceanic plate promoted spontaneous SI. We suggest that thermal rejuvenation of the overriding plate just before 50 Ma caused a reduction in overriding plate strength and an increase in the age contrast (hence buoyancy) between the two plates, leading to SI. The computational models map out a framework in which rejuvenated relic arcs are a favorable tectonic environment for promoting subduction initiation, while transform faults and passive margins are not. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84943279323&doi=10.1002%2f2015GL064985&partnerID=40&md5=a4f29d261a2e3abc95fbb51fd12b2bff
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9062
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China
Recommended Citation:
Leng W.,Gurnis M.. Subduction initiation at relic arcs[J]. Geophysical Research Letters,2015-01-01,42(17).