DOI: 10.1016/j.earscirev.2019.102882
论文题名: The role of serpentinization and magmatism in the formation of decoupling interfaces at magma-poor rifted margins
作者: Gillard M. ; Tugend J. ; Müntener O. ; Manatschal G. ; Karner G.D. ; Autin J. ; Sauter D. ; Figueredo P.H. ; Ulrich M.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 196 语种: 英语
中文关键词: Decoupling
; Magma-poor margins
; Seismic interpretation
; Serpentinization
英文关键词: deformation
; magma
; magmatism
; oceanic crust
; peridotite
; rheology
; rift zone
; seismic reflection
; seismicity
; serpentinization
; spreading center
英文摘要: In spite of recent progress in the understanding of magma-poor rifted margins, the processes leading to the formation and evolution of the exhumed mantle domain and its transition toward steady state oceanic crust remain debated. In particular, the parameters controlling the progressive localization of extensional deformation and magmatic processes leading to the formation of an oceanic spreading center are poorly understood. In this paper, we highlight the occurrence of two major decoupling horizons controlling the structural and magmatic evolution of distal magma-poor rifted margins. They are marked by strong seismic reflectors located at about 1 s TWTT (Upper Reflectors–UR) and 2 s TWTT (Lower Reflectors–LR) below top basement in domains of exhumed mantle at several magma-poor rifted margins. Both reflection seismic observations and studies on the physical properties of serpentinized mantle suggest that the UR likely results from deformation localized along a rheological interface at about 3 km below top basement, associated with an abrupt change in the mechanical behavior of peridotites once they are serpentinized to ~15%. We suggest that this interface played a major role in successive fault re-organizations during formation of the exhumed mantle domain. The comparison of reflection seismic observations with Alpine field analogues suggests that the LR likely results from an interaction between magmatism, deformation and hydration reactions during final rifting. Based on our results, we suggest that during final rifting the strain distribution is controlled first by hydration and then by magmatic processes in the domain of exhumed mantle. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165814
Appears in Collections: 气候变化与战略
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作者单位: Institut de Physique du Globe de Strasbourg, UMR7516, Université de Strasbourg/EOST, CNRS, 1 rue Blessig, Cedex, Strasbourg, F-67084, France; Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP UMR 7193, Paris, F-75005, France; Total SA, R&D Department CSTJF, Pau, France; Institute of Earth Sciences, University of Lausanne, Géopolis, Lausanne, CH-1015, Switzerland; ExxonMobil Upstream Integrated Solutions Company, Global Tectonics & Structure, 22777 Springwoods Village Parkway, Spring, TX, United States
Recommended Citation:
Gillard M.,Tugend J.,Müntener O.,et al. The role of serpentinization and magmatism in the formation of decoupling interfaces at magma-poor rifted margins[J]. Earth Science Reviews,2019-01-01,196