DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/12209

Title: A Study of Mylonites from parts of the Salem-Attur Shear Zone (Tamil Nadu) and its Tectonic Implications
Authors: BISWAL, TK
THIRUKUMARAN, V
RATRE, K
BANDYAPADHAYA, K
SUNDARALINGAM, K
MONDAL, AK
Keywords: south-india
stretching lineations
karnataka
shield
moyar
Issue Date: 2010
Publisher: SPRINGER INDIA
Citation: JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 75(1), 128-136
Abstract: The E-W running Salem-Attur shear zone demarcates the tectonic boundary between Archaean Dharwar Craton in the north and Proterozoic Southern granulite terrane in the south. This study reveals that the shear zone is a low angle thrust. The thrust zone is around 10 m thick and it merges with the main shear zone along the strike. The thrust is developed on charnockite near Odyarpatti, which is retrograded into schists. Further, it is marked by gently dipping mylonitic foliation and subhorizontal lineation. The S-C fabric, mantled porphyroclasts and intragranular faults indicate northeasterly slip along the thrust. Recumbent shear folds SF 1 are developed within the thrust zone. The thrust has been folded by late stage F 2 fold which has brought variation in the orientation of the mylonitic foliation from subhorizontal to vertical attitude; the mylonitic lineations have been rotated to subvertical orientation also. Additionally, the F 2 crenulations and shear cleavages and intersection lineations are superimposed on the mylonitic fabric. Thrusting along the Salem-Attur shear zone is probably the cause for upliftment of the charnockites to the upper crust. Post-upliftment stage has witnessed brittle deformation in the form of development of shear fractures in NNE-SSW and E-W directions. Pseudotachylites are emplaced along these fractures.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/12209
http://hdl.handle.net/10054/12209
ISSN: 0016-7622
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback