DOI: 10.1016/j.epsl.2020.116218
论文题名: A complete structural model and kinematic history for distributed deformation in the Wharton Basin
作者: Stevens D.E. ; McNeill L.C. ; Henstock T.J. ; Delescluse M. ; Chamot-Rooke N. ; Bull J.M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 538 语种: 英语
中文关键词: diffuse plate boundary
; Indian Ocean
; intraplate deformation
; IODP
英文关键词: Bathymetry
; Deformation
; Plates (structural components)
; Strike-slip faults
; Diffuse plate boundaries
; Distributed deformation
; Indian ocean
; Intraplate earthquakes
; IODP
; Multibeam bathymetry
; Rheological property
; Sedimentary sequence
; Fault slips
; chronostratigraphy
; deformation mechanism
; intraplate process
; plate boundary
; plate motion
; plate tectonics
; rheology
; sedimentary sequence
; spreading center
; structural geology
; subduction zone
; Indian Ocean
; Wharton Basin
英文摘要: The equatorial eastern Indian Ocean hosts a diffuse plate boundary, where widespread deformation accommodates the relative motion between the Indian, Australian and Capricorn sub-plates. We integrate IODP Expedition 362 borehole data, which for the first time provides an accurate, ground-truthed chronostratigraphy of the sedimentary sequence east of the Ninety East Ridge (NER), with 2D seismic reflection profiles and multibeam bathymetry to assess the styles of faulting between the NER and the Sunda subduction zone, timing of activity and comparison with physical and rheological properties. We identify four distinct fault sets east of the NER in the northern Wharton Basin. N-S (350-010°) orientated faults, associated with the N-S fracture zones formed at the now extinct Wharton spreading centre, are still active and have been continuously active since at least 10 Ma. NNE- and WNW-trending fault fabrics develop between the fracture zones. The orientations and likely sense of displacement on these three sets of faults defines a Riedel shear system responding to ∼NNE-SSW left-lateral strike-slip activity at depth, demonstrated by the recent 2012 great intraplate earthquakes. We also find evidence of ∼NE-SW reverse faults, similar in style to E-W reverse faults observed west of the NER, where reverse faulting is more dominant. We show that the activity of this strike-slip system increased ca. 7-9 Ma, contemporaneous with reverse faulting and intraplate deformation west of the NER. © 2020 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165287
Appears in Collections: 气候变化与战略
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作者单位: Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, S014 3ZH, United Kingdom; ENS Laboratoire de Géologie, CNRS UMR8538, PSL Research University, Paris, France
Recommended Citation:
Stevens D.E.,McNeill L.C.,Henstock T.J.,et al. A complete structural model and kinematic history for distributed deformation in the Wharton Basin[J]. Earth and Planetary Science Letters,2020-01-01,538