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Dutt, Krishan
- Event Stratigraphy and Physico-Chemical Characters of Banded Gneissic Complex and Associated Supracrustals in the South Mewar Plains of Rajasthan
Abstract Views :173 |
PDF Views:1
Authors
Utpal Bose
1,
A. K. Mathur
1,
K. C. Sahoo
2,
S. Bhattacharya
1,
Krishan Dutt
1,
V. Aneel Kumar
3,
S. S. Sarkar
1,
S. Chowdhury
1,
I. Chowdhury
1
Affiliations
1 Geological Survey of India, Jhalana Dungri, Jaipur - 302 004, IN
2 Geological Survey of India, Bhubaneswar - 751 012, IN
3 Geological Survey of India, Hyderabad - 500 660, IN
1 Geological Survey of India, Jhalana Dungri, Jaipur - 302 004, IN
2 Geological Survey of India, Bhubaneswar - 751 012, IN
3 Geological Survey of India, Hyderabad - 500 660, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 47, No 3 (1996), Pagination: 325-338Abstract
The oldest cratonic nucleus pf the Western Indian shield, familiarly known as the Banded Gneissic Complex (BGC), occupies a large tract in the Mcwar plains of South Rajasthan. It has essentially an old gneissic component (3.3 Ga) and a host of mafic bodies associated with detrital and chemogenic sediments which have been subjected to multiple phases of anatexis and granite intrusions (2.9 Ga and later events). The emplacement of Berach granite and succeeding dolerite dyke swarms mark the end-Archaean cratonization process. This also initiated intracratonic and cratonmarginal basin formation.Later magmatism, especially along the basement-cover interface. is due to local remobilisation of the basement at the time of Proterozoic orogeny.
Keywords
Banded Gneissic Complex, Stratigraphy, Petrochemistry, Rajasthan.- Development of Ductile Shear Zones during Diapiric Magmatism of Nepheline Syenite and Exhumation of Granulites-Examples from Central Rajasthan, India
Abstract Views :233 |
PDF Views:102
Authors
Affiliations
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 H. No. 20/75, Mansarovar, Jaipur 302 020, IN
3 No. 301, A.R. Complex, I-Block, Sector-14, Hiran Magri, Udaipur 313 001, IN
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 H. No. 20/75, Mansarovar, Jaipur 302 020, IN
3 No. 301, A.R. Complex, I-Block, Sector-14, Hiran Magri, Udaipur 313 001, IN
Source
Current Science, Vol 110, No 6 (2016), Pagination: 1094-1101Abstract
The present communication discusses two separate instances where features commonly observed in DSZ are noted, one along the margin of the Kisengarh nepheline syenite and the other in the granulite bodies the Sandmata Complex in Rajasthan, India. The foliations in the nepheline syenite pluton show features similar to the mylonite gneisses that characterize DSZs in orogenic belts. Apart from simulating LS tectonite- type fabric the continuity of similar structures in adjacent cover rocks provides evidence of heterogeneous deformation during upward ascent of nepheline syenite. Based on tectono-metamorphic studies on granulites suggestion is made about the uplift of deepseated granulites accompanied by ductile shearing on along the margins. The development of DSZ along margins helped in reducing the frictional resistance during upward ascent and emplacement into Archaean gneissic terrane. The process is comparable to buoyancy- induced diapiric uplift of hot plutonic bodies through cooler upper crust.Keywords
Ductile Shear Zone, Diapiric Magmatism, Exhumation of Granulites, Emplacement of Plutonic Bodies.References
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