气候变化领域集成服务门户(CCPortal): Layer parallel stretching? Characterising magnetic and pore-fabric styles at a rifted continental margin: New insights from the Otway Ranges, Australia

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DOI	10.1016/j.tecto.2021.228975
	Layer parallel stretching? Characterising magnetic and pore-fabric styles at a rifted continental margin: New insights from the Otway Ranges, Australia
	Burgin H.B.; Robion P.; Amrouch K.
发表日期	2021
ISSN	00401951
卷号	815
英文摘要	This study presents the first analysis of the anisotropy of magnetic susceptibility (AMS) coupled with anisotropy of P-wave velocity (APV) in sedimentary rocks from a passive continental margin. In the Otway Ranges, Australia, the Lower Cretaceous sediments deposited during a period of subsidence and structural quiescence display triaxial-magnetic fabrics typical of extensional deformation. The extensional interpretation from AMS is also supported by the orientation of the pore fabric measured using APV. The inferred extensional azimuths from both AMS and APV analyses are in good agreement with axes for renewed Late Cretaceous rifting and the continental break up of Gondwana, a period of structural evolution characterised by abnormally-high levels of paleostress in the Otway Basin. Predicated on this we introduce the concept of layer parallel stretching (LPSt), a process that describes pore-scale structuring representative of the first phase of extensional deformation during periods of intense tectonic extension, in this case the LPSt was oriented NE-SW. These extensional structural fabrics in the Otway Basin were preserved during NE-SW oriented basin inversion, a process that involved reactivation of the local detachment, the partitioning of strain, and low levels of coupling between the basement and the cover. The results highlight the applicability of AMS and APV for characterising rock anisotropy in sedimentary basins at continental margins and have distinct outcomes with respect to the structural framework of the study area in the Otway Ranges. © 2021 Elsevier B.V.
英文关键词	Deformation; Magnetic anisotropy; Magnetic susceptibility; Magnetism; Sedimentology; Seismic waves; Structural geology; Wave propagation; Anisotropy of magnetic susceptibility; Continental break-up; Continental margin; Extensional deformation; Passive continental margin; Rifted continental margin; Structural evolution; Structural frameworks; Sedimentary rocks; azimuth; continental margin; deformation mechanism; magnetic susceptibility; P-wave; paleostress; sedimentary basin; seismic anisotropy; seismic velocity
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207950
作者单位	Australian School of Petroleum, University of Adelaide, North Tce, Adelaide, 5005, Australia; Geosciences et Environment Cergy, CY Cergy Paris University, Maison Internationale de la Recherche, 1 rue DescartesNeuville-sur-Oise 95000, France
推荐引用方式 GB/T 7714	Burgin H.B.,Robion P.,Amrouch K.. Layer parallel stretching? Characterising magnetic and pore-fabric styles at a rifted continental margin: New insights from the Otway Ranges, Australia[J],2021,815.
APA	Burgin H.B.,Robion P.,&Amrouch K..(2021).Layer parallel stretching? Characterising magnetic and pore-fabric styles at a rifted continental margin: New insights from the Otway Ranges, Australia.Tectonophysics,815.
MLA	Burgin H.B.,et al."Layer parallel stretching? Characterising magnetic and pore-fabric styles at a rifted continental margin: New insights from the Otway Ranges, Australia".Tectonophysics 815(2021).