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Deformational history of Eastern Ghat Mobile Belt around Lathore, Balangir district, Orissa

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Title Deformational history of Eastern Ghat Mobile Belt around Lathore, Balangir district, Orissa
 
Creator BISWAL, TK
SANJEEVAN, G
NAYAK, BP
 
Subject charnockites
tectonics
india
structural geology
eastern ghat mobile belt
orissa
 
Description The calc-gneiss and garnet-sillimanite-gneiss of Eastern Ghat Mobile Belt around Lathore bear the imprint of multiple phases of deformtion. The folds of the first generation, F-1, are isoclinal, intrafolial and vary in style from reclined to upright. This has developed a pervasive axial planar gneissosity. The second generation folds, F-2, which are coaxial with the F-1 are open to tight with a planar axial surface dipping moderately to SE and varied plunging axis. At places mesoscopic plane non-cylindrical F-2 sheath folds are noticed. Gentle upright folds, F-3, with NW-SE striking axial plane represent structure of third generation. Superimposition of F-2 on F-1 has resulted in Type 3 interference pattern and dome and basin structures are due to the interference of F-2 and F-3 folds. F-1 and F-2 folds are attributed to WNW-ESE buckling and F-3 is reported to be due to shortening across it, The 'sheath folds' are due to heterogeneous simple shear along the axial plane of the F-2 fold. The map shows a large scale southwesterly plunging overturned F-2 fold. Post-exhumation deformation has resulted in brittle shearing parallel to the axial plane of F-2 fold. The structure of the area points to a collisional tectonic setting like other granulite belts of Gondwanaland.
 
Publisher GEOLOGICAL SOC INDIA
 
Date 2011-07-29T22:23:36Z
2011-12-26T12:52:40Z
2011-12-27T05:39:18Z
2011-07-29T22:23:36Z
2011-12-26T12:52:40Z
2011-12-27T05:39:18Z
1998
 
Type Article
 
Identifier JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 51(2), 219-225
0016-7622
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7850
http://hdl.handle.net/10054/7850
 
Language en