DOI: 10.1002/2015GL066237
论文题名: Evidence for long-lived subduction of an ancient tectonic plate beneath the southern Indian Ocean
作者: Simmons N.A. ; Myers S.C. ; Johannesson G. ; Matzel E. ; Grand S.P.
刊名: Geophysical Research Letters
ISSN: 0094-8509
EISSN: 1944-8240
出版年: 2015
卷: 42, 期: 21 起始页码: 9270
结束页码: 9278
语种: 英语
英文关键词: global tomography
; Indian Ocean
; Kerguelen Plateau
; mesozoic subduction
; Nuclear Explosion Monitoring
; Southeast Indian Ridge
Scopus关键词: Nuclear explosions
; Oceanography
; Seismic waves
; Seismology
; Structural geology
; Tectonics
; Tomography
; Core-mantle boundary
; Indian ocean
; Kerguelen plateau
; Mesozoic
; Southeast Indian Ridge
; Southern Hemisphere
; Southern indian ocean
; Tomographic images
; Plates (structural components)
; core-mantle boundary
; global perspective
; Gondwana
; Mesozoic
; nuclear explosion
; seismic data
; seismic tomography
; slab
; Southern Hemisphere
; subduction zone
; tectonic evolution
; tectonic plate
; Tethys
; transition zone
; upper mantle
; Eurasia
; Indian Ocean
; Indian Ocean (South)
; Kerguelen Plateau
; Mid-Indian Ridge
; North America
; Southeast Indian Ridge
英文摘要: Ancient subducted tectonic plates have been observed in past seismic images of the mantle beneath North America and Eurasia, and it is likely that other ancient slab structures have remained largely hidden, particularly in the seismic-data-limited regions beneath the vast oceans in the Southern Hemisphere. Here we present a new global tomographic image, which shows a slab-like structure beneath the southern Indian Ocean with coherency from the upper mantle to the core-mantle boundary region - a feature that has never been identified. We postulate that the structure is an ancient tectonic plate that sank into the mantle along an extensive intraoceanic subduction zone that migrated southwestward across the ancient Tethys Ocean in the Mesozoic Era. Slab material still trapped in the transition zone is positioned near the edge of East Gondwana at 140 Ma suggesting that subduction terminated near the margin of the ancient continent prior to breakup and subsequent dispersal of its subcontinents. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955214412&doi=10.1002%2f2015GL066237&partnerID=40&md5=26acfa4d7d651589bc2c15fa7aa2c1dd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8125
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: Geophysical Monitoring Programs, Lawrence Livermore National Laboratory, Livermore, CA, United States
Recommended Citation:
Simmons N.A.,Myers S.C.,Johannesson G.,et al. Evidence for long-lived subduction of an ancient tectonic plate beneath the southern Indian Ocean[J]. Geophysical Research Letters,2015-01-01,42(21).