DOI: 10.1016/j.tecto.2020.228552
论文题名: Variations in faulting style of the Southwest Indian Ridge (46°–53.5°E): Implications for crustal accretion process at ultraslow-spreading ridges
作者: Liu C. ; Li J. ; Tao C. ; Fan Q. ; Song J. ; Luo Y. ; Feng B.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 790 语种: 英语
中文关键词: Amagmatic segment
; Detachment fault
; Magma supply
; Multi-beam bathymetry
; Southwest Indian Ridge
英文关键词: Transform faults
; Accretion process
; Amagmatic segment
; Detachment fault
; Fault characteristics
; Serpentinization
; Southwest Indian Ridge
; Study areas
; Ultra-slow spreading
; Flip flop circuits
; accretion
; bathymetry
; crustal structure
; detachment fault
; faulting
; heave
; magma
; Indian Ocean
; Mid-Indian Ridge
英文摘要: The variations in faulting style at the Southwest Indian Ridge (SWIR) 46°–53.5°E segment, correspond to different patterns of crustal accretion under different magma supply in an ultraslow-spreading ridge. We use multi-beam and filtered bathymetry to identify the fault characteristics and measure the fraction of magmatic accretion M and axial valley depth D. Four styles of faulting, namely, mode-C, mode-E, one-side detachment, and flip-flop detachment faults, are identified in the study area. The heave of these four faulting styles tends to increase gradually, and these faults can be progressive evolve in order from symmetrical to asymmetrical spreading. The reducing M significantly affects the faulting styles from mode-C to mode-E faults by largening fault heave, resulting in a deeper D at mode-E faults. However, there was no significant difference in M and D from mode-E to one-side detachment faults with the increase of heave. We consider that more magma may preferentially intrude into the asthenosphere at one-side detachment faults. Moreover, the flip-flop detachment faults are developed at the amagmatic segments, constrained by the extreme low M, talc- serpentinization, and dense transform faults. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170645
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Division of Geology and Mineral Resources, Beijing Research Institute of Uranium Geology, Beijing, 100029, China; The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, 100871, China; Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, 310012, China
Recommended Citation:
Liu C.,Li J.,Tao C.,et al. Variations in faulting style of the Southwest Indian Ridge (46°–53.5°E): Implications for crustal accretion process at ultraslow-spreading ridges[J]. Tectonophysics,2020-01-01,790