DOI: 10.1007/s00531-016-1349-5
Scopus记录号: 2-s2.0-85016321817
论文题名: Multidisciplinary approach to constrain kinematics of fault zones at shallow depths: a case study from the Cameros–Demanda thrust (North Spain)
作者: Casas-Sainz A.M. ; Román-Berdiel T. ; Oliva-Urcia B. ; García-Lasanta C. ; Villalaín J.J. ; Aldega L. ; Corrado S. ; Caricchi C. ; Invernizzi C. ; Osácar M.C.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期: 3 起始页码: 1023
结束页码: 1055
语种: 英语
英文关键词: Cameros–Demanda thrust
; Fault rock
; Intraplate thrusting
; Magnetic techniques
; Paleothermometry
; Transport direction
Scopus关键词: deformation
; fault zone
; geothermometry
; intraplate process
; magnetic anisotropy
; magnetic susceptibility
; outcrop
; remagnetization
; strain partitioning
; thrust fault
; Spain
英文摘要:
Thrusting at shallow depths often precludes analysis by means of structural indicators effective in other geological contexts (e.g., mylonites, sheath folds, shear bands). In this paper, a combination of techniques (including structural analysis, magnetic methods, as anisotropy of magnetic susceptibility and paleomagnetism, and paleothermometry) is used to define thrusting conditions, deformation, and transport directions in the Cameros–Demanda thrust (North Spain). Three outcrops were analyzed along this intraplate, large-scale major structure having 150 km of outcropping length, 30 km of maximum horizontal displacement, and 5 km of vertical throw. Results obtained by means of the different techniques are compared with data derived from cross sections and stratigraphic analysis. Mixed-layer illite–smectite and vitrinite reflectance indicating deep diagenetic conditions and mature stage of hydrocarbon generation suggests shallow depths during deformation, thus confirming that the protolith for most of the fault rocks is the footwall of the main thrust. Kinematic indicators (foliation, S/C structures, and slickenside striations) indicate altogether a dominant NNW movement of the hanging wall in the western zone and NE in the eastern zone of the thrust, thus implying strain partitioning between different branches of the main thrust. The study of AMS in fault rocks (nearly 400 samples of fault gouge, breccia, and microbreccia) indicates that the strike of magnetic foliation is oblique to the transport direction and that the magnetic lineation parallelizes the projection of the transport direction onto the kmax/kint plane in sites with strong shear deformation. Paleomagnetism applied to fault rocks indicates the existence of remagnetizations linked to thrusting, in spite of the shallow depth for deformation, and a strong deformation or scattering of the magnetic remanence vectors in the fault zone. The application of the described techniques and consistency of results indicate that the proposed multidisciplinary approach is useful when dealing with thrusts at shallow crustal levels. © 2016, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85016321817&doi=10.1007%2fs00531-016-1349-5&partnerID=40&md5=68b344dc177482e5122167171d29eaae
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70041
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, Saragossa, Spain; Departamento de Geología y Geoquímica, Universidad Autónoma de Madrid, Madrid, Spain; Laboratorio de Paleomagnetismo, Departamento de Física, Universidad de Burgos, Burgos, Spain; Dipartimento di Scienze della Terra, Sapienza Università di Roma, Rome, Italy; Dipartimento di Scienze, Università Roma Tre, Rome, Italy; Scuola di Scienze e Tecnologie, Sezione Geologia, Università di Camerino, Camerino, Italy
Recommended Citation:
Casas-Sainz A.M.,Román-Berdiel T.,Oliva-Urcia B.,et al. Multidisciplinary approach to constrain kinematics of fault zones at shallow depths: a case study from the Cameros–Demanda thrust (North Spain)[J]. International Journal of Earth Sciences,2017-01-01,106(3)