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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/21936
Title: Determining the reference frame for kinematic analysis in S-tectonites using AMS
Authors: Mamtani M.A.
Abhijith V.
Lahiri S.
Rana V.
Bhatt, Sandeep
Goswami S.
Renjith A.R.
Published in: Journal of the Geological Society of India
Abstract: In this paper a methodology based on anisotropy of magnetic susceptibility (AMS) measurements is presented to identify XZ section of the strain ellipsoid in order to perform kinematic analysis in S-tectonites, which are rocks that lack stretching lineation on the foliation plane. The similarity between orientations of three principal axes of the AMS ellipsoid (K1>K2>K3) and strain ellipsoid (X>Y>Z) is demonstrated by discussing the case of a mylonite (LS-tectonite) that contains both foliation and stretching lineation. Subsequently, the case of S-tectonite from the peninsular gneiss (south India) is discussed, where the K1K3 plane of AMS ellipsoid is equated with XZ section of strain ellipsoid. Quartz crystallographic preferred orientations are investigated using SEM-EBSD studies in thin section prepared parallel to the K1K3 plane. Quartz c-axis patterns characteristic of rhomb <a> slip and indicating top-to-325° sense of shear are recorded. This supports the movement sense inferred by earlier researchers from northern parts of the sampled locality. Thus the usefulness of AMS in determining the reference frame for kinematic studies in S-tectonites is documented. © 2017, Geological Society of India.
Citation: Journal of the Geological Society of India, 90(1): 5-8
URI: https://doi.org/10.1007/s12594-017-0657-0
http://repository.iitr.ac.in/handle/123456789/21936
Issue Date: 2017
Publisher: Geological Society of India
Keywords: gneiss
kinematics
magnetic anisotropy
mylonite
preferred orientation
quartz
ISSN: 167622
Author Scopus IDs: 6603430233
57195053342
57189344027
10238881000
57192093677
57192209960
56176888400
Author Affiliations: Mamtani, M.A., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Abhijith, V., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Lahiri, S., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Rana, V., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Bhatt, S., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Goswami, S., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Renjith, A.R., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Corresponding Author: Mamtani, M.A.; Department of Geology and Geophysics, India; email: mamtani@gg.iitkgp.ernet.in
Appears in Collections:Journal Publications [ES]

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