DOI: 10.1016/j.tecto.2021.228996
论文题名: Magnetic fabrics in an apparently undeformed granite body near Main Boundary Thrust (MBT), Kumaun Lesser Himalaya, India
作者: Agarwal A. ; Srivastava D.C. ; Shah J. ; Mamtani M.A.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 815 语种: 英语
中文关键词: Amritpur Granite
; Anisotropy of magnetic susceptibility
; Magnetic fabric
; Main Boundary Thrust
; Structural analysis
; Tectonic fabric
英文关键词: Magnetic anisotropy
; Magnetic susceptibility
; Magnetism
; Mapping
; Superconducting materials
; Tectonics
; Anisotropy of magnetic susceptibility
; Deformation phase
; High-resolution mapping
; Main boundary thrusts
; Mesoscopic scale
; Structural setting
; Tectonic fabrics
; Tectonic settings
; Granite
英文摘要: The Amritpur Granite, sandwiched between the two intensely deformed rock packages, occurs adjacent to the Main Boundary Thrust (MBT) in the outer part of the Kumaun Lesser Himalaya. Characteristically, the granite lacks any penetrative tectonic fabric at the microscopic or mesoscopic scales. Using high-resolution mapping, litholog, and outcrop-scale overprinting relationships, we first revisit the tectonic setting of the Amritpur Granite and then attempt to detect the magnetic fabric, if any, in it. For this, we investigate the anisotropy of magnetic susceptibility in the Amritpur Granite and the adjacent lithounits deformed presumably during the Himalayan orogeny. High-resolution mapping demonstrates that the MBT traces the boundary between the Neogene Siwalik sediments and the Proterozoic amphibolite of the Nagthat Formation in the study area. Field relationships and structural setting imply that the granite occurs either as a probable klippe or a basement sliver. The orientations of the mesoscopic scale foliations and lineations are similar to the respective magnetic fabric orientations in the deformed lithounits occurring adjacent to the Amritpur Granite. The tectonically induced magnetic fabric orientations in the deformed lithounits also correlate well with the magnetic fabric orientations in the Amritpur Granite. Several lines of evidence suggest that the magnetic fabrics in the Amritpur Granite and those in the adjacent deformed lithounits were induced during a common deformation phase. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170760
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth Sciences, Indian Institute of Technology Kanpur, Kanpur, 208 016, India; Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247 667, India; Department of Geology & Geophysics, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721 302, India
Recommended Citation:
Agarwal A.,Srivastava D.C.,Shah J.,et al. Magnetic fabrics in an apparently undeformed granite body near Main Boundary Thrust (MBT), Kumaun Lesser Himalaya, India[J]. Tectonophysics,2021-01-01,815