DOI: 10.1016/j.tecto.2020.228573
论文题名: Magnetic fabric in carbonatic rocks from thrust shear zones: A study from the Northern Apennines (Italy)
作者: Satolli S. ; Robustelli Test C. ; Staneczek D. ; Zanella E. ; Calamita F. ; Tema E.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 791 语种: 英语
中文关键词: Magnetic fabric
; Pure shear
; Simple shear
; Structural geology
; Tectonites
英文关键词: Cluster analysis
; Magnetic susceptibility
; Magnetism
; Sedimentology
; Shear deformation
; Silicates
; Structural analysis
; Structural geology
; Tectonics
; Anisotropy of magnetic susceptibility
; Magnetic foliation
; Magnetic lineations
; Northern Apennines
; Pure shear deformations
; Sc and s tectonites
; Structural characteristics
; Transport direction
; Magnetic anisotropy
; carbonate rock
; Cretaceous
; magnetic anisotropy
; magnetic fabric
; marl
; Neogene
; shear zone
; thrust
; Apennines
; Italy
英文摘要: We present the results of an integrated structural and anisotropy of magnetic susceptibility (AMS) investigation in calcareous and marly rocks from thrust shear zones. A total of 17 sites from six localities along the frontal and oblique ramp of the Olevano-Antrodoco-Sibillini thrust and back thrust (Northern Apennines, Italy) were studied to investigate both magnetic fabric and structural characteristics of Cretaceous to Neogene calcareous and marly rocks. In most of the sites AMS is controlled by the paramagnetic minerals (prevailingly phyllosilicates), with minor contribution of ferromagnetic (sensu latu) ones. Structural analysis shows the presence of SC- and S-tectonites associated to predominant simple and pure shear, respectively. The combination of density diagrams and cluster analysis allowed discriminating the contributions of sedimentary and tectonic processes to the bulk magnetic fabric. Six different subfabrics were distinguished, related to the structural data and associated to deformation stages and regimes: A. sedimentary fabric; B. intersection lineation; C. magnetic foliation parallel to S planes with k1 parallel to the S/C intersection; D. k1 moving toward the slip vector; E. magnetic foliation parallel either to the S or the C planes, with k1 parallel to the slip vector or the transport direction; F. k1 parallel to extensional planes intersection. The magnetic foliation has a double tendency to parallelize to pressure solution cleavage (S) and shear planes (C), while the magnetic lineation tends to progressively align with the slip vector, except for pure-shear-dominated sites at less than 15–20 cm from the thrust, where it aligns with the transport direction. The magnetic fabric is dominated by simple shear deformation. The protocol applied for AMS analysis shows a great potential to unravel mixed sedimentary and/or tectonic features in magnetic fabrics. AMS can be considered as a useful tool in unravelling the variation of simple-pure shear deformation regime in shear zones. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170705
Appears in Collections: 气候变化与战略
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作者单位: Dipartimento di Ingegneria e Geologia, Università degli Studi “G. d'Annunzio” di Chieti-Pescara, via dei Vestini 31, Chieti, 66100, Italy; CIMaN-ALP, Centro Interuniversitario di Magnetismo Naturale - Alpine Laboratory of Paleomagnetism, via Luigi Massa 4, Peveragno, 12016, Italy; Dipartimento di Scienze della Terra, Università degli Studi di Torino, via Valperga Caluso 35, Torino, 10125, Italy; Institute of Geophysics, Polish Academy of Sciences, Księcia Janusza 64, Warszawa, 01-452, Poland
Recommended Citation:
Satolli S.,Robustelli Test C.,Staneczek D.,et al. Magnetic fabric in carbonatic rocks from thrust shear zones: A study from the Northern Apennines (Italy)[J]. Tectonophysics,2020-01-01,791