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Biswal, T. K.
- Deformational History of Eastern Ghat Mobile Belt Around Lathore, Balangir District, Orissa
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Authors
Affiliations
1 Indian Institute of Technology, Dept. of Earth Sciences, Powai, Mumbai-400 076, IN
1 Indian Institute of Technology, Dept. of Earth Sciences, Powai, Mumbai-400 076, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 2 (1998), Pagination: 219-225Abstract
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, F1, are isoclinal, intrafolial and vary in style from reclined to upright. This has developed a pervasive axial planar gneissosity. The second generation folds, F2 , which are coaxial with the F1 are open to tight with a planar axial surface dipping moderately to SE and varied plunging axis. At places mesoscopic plane non-cylindrical F2 sheath folds are noticed. Gentle upright folds, F3 , with NW-SE striking axial plane represent structure of third generation. Superimposition of F2 on F1 has resulted in Type 3 interference pattern and dome and basin structures are due to the interference of F2 and F3 folds. F1 and F2 folds are attributed to WNW-ESE buckling and F3 is reported to be due to shortening across it. The 'sheath folds' are due to heterogeneous simple shear aiong the axial plane of the F2 fold. The map shows a large scale southwesterly plunging overturned F2 fold. Post-exhumation deformation has resulted in brittle shearing parallel to the axial plane of F2 fold. The structure of the area points to a collisional tectonic setting like other granulite belts of Gondwanaland.Keywords
Structural Geology, Eastern Ghat Mobile Belt, Orissa.- Rb-Sr Age and Sr Isotopic Composition of Alkaline Dykes near Mumbai: Further Evidence for the Deccan Trap-Reunion Plume Connection
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Authors
Affiliations
1 Indian Institute of Technology, Mumbai - 400 076., IN
2 National Geophysical ,Research Laboratory, Hyderabad - 500 007., IN
3 Royal Holloway, University of London, Egham, Surrey TW20 OEX, GB
1 Indian Institute of Technology, Mumbai - 400 076., IN
2 National Geophysical ,Research Laboratory, Hyderabad - 500 007., IN
3 Royal Holloway, University of London, Egham, Surrey TW20 OEX, GB
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 5 (2003), Pagination: 641-646Abstract
No Abstract.- Pseudotachylites of the Kui-Chitraseni Shear Zones of the Precambrian Aravalli Mountain, Rajasthan
Abstract Views :174 |
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Authors
Affiliations
1 Indian Institute of Technology, Powai, Mumbai - 400 076, IN
1 Indian Institute of Technology, Powai, Mumbai - 400 076, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 3 (2004), Pagination: 325-335Abstract
Cataclasites-pseudotachylites are developed along the Kui-Chitraseni shear zone of the Aravalli Mountain. The pseudotachylites are microlitic belonging to three varieties referred to here as patchy-, vein- and fracture- pseudotachylites. The patchy pseudotachylites are the most dominating type that occur in association with cataclasites and show an increase in abundance from the margin of the shear zone towards the center. Vein pseudotachylites owe their origin to the injection of the patchy variety through extensional fractures. Fracture pseudotachylites, the youngest of all, occur along the late stage shear fractures. Presence of vesicles, flow texture, embayed margin of the clasts in addition to power law distribution of coarser clasts and high values of roundness (0.4) support the melt origin of the pseudotachylites. Ultracataclasis followed by frictional melting of the Erinpura granites along the shear zone is ascribed for the development of the cataclasites and pseudotachylites.Keywords
Pseudotachylites, Melt Origin, Kui-Chitraseni Shear Zone, Aravalli Mountain, Erinpura Granite.- Deformation of Terrane Boundary Shear Zone (Lakhna Shear Zone) between Eastern Ghats Mobile Belt and Bastar Craton in Balangir and Kalahandi Districts, Orissa
Abstract Views :264 |
PDF Views:8
Authors
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai, 400 076, IN
1 Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai, 400 076, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 4 (2000), Pagination: 367-380Abstract
The terrane boundary between Eastern Ghats Mobile Belt and the Bastar Craton in Balangir and Kalahandi Districts of Orissa is distinctly marked by nearly two kilometer wide southeasterly dipping ductile shear zone, designated as the Lakhna shear zone. The shear zone has largely developed in the craton, but for a narrow width within the Fastern Ghats. It is dominated by quartzofcldspathic mylonites characterised by S-C fabric, asymmetric winged porphyroclasts, quartz ribbons and intragranuhr faults. These structures have been effectively utilized in deducing the sense of shear and evaluating the amount of strain. The results show thrusting of the Eastern Ghats over the Bastar Craton. The minimum amount of throw along the thrust has becn estimated to be around 2.5 to 4.7 km assuming a dominant simple shear deformation.Keywords
Terrane Boundary, Lakhna Shear Zone, Strain Evaluation, Eastern Ghats Mobile Belt, Bastar Craton, Orissa.- A Study of Mylonites from Parts of the Salem-Attur Shear Zone (Tamil Nadu) and its Tectonic Implications
Abstract Views :177 |
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Authors
T. K. Biswal
1,
V. Thirukumaran
2,
Kamleshwar Ratre
1,
Krishanu Bandyapadhaya
1,
K. Sundaralingam
1,
Amit Kumar Mondal
1
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, IN
2 Department of Geology, Govt. Arts College, Salem-636 007, IN
1 Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, IN
2 Department of Geology, Govt. Arts College, Salem-636 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 128-136Abstract
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 SF1 are developed within the thrust zone. The thrust has been folded by late stage F2 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 F2 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.Keywords
Mylonites, Pseudotachylites, Low Angle Thrust, Salem-Attur Shear Zone.References
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