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Mahadevan, T. M.
- Nuclear Geology and Atomic Mineral Resources
Authors
1 'Sreebagh', Amman Koil Street, Ernakulam, Kochi - 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 2 (2000), Pagination: 212-213Abstract
No Abstract.Full Text
- Mantle Heterogeneity and Archaean Crustal Tectonics
Authors
1 Sreebagh, Ammankoil Road, Kochi - 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 6 (1998), Pagination: 829-829Abstract
No Abstract.Full Text
- Space-Time Controls in Precambrian Uranium Mineralisation in India
Authors
1 Atomic Minerals Division, Department of Atomic Energy, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 1 (1986), Pagination: 47-62Abstract
A review of the geochronological and stratigraphic data of the Indian Precambrian in relation to the major uranium mineralised belts in India brings out the time as we11 as space-bound character of the uranium mineralisation. An early period of quartz-pebble conglomerate type mineralisation met with in parts of South Karnataka, Eastern India and parts of Madhya Pradesh, Uttar Pradesh and Rajasthan falls in the timeband of 2900-2600 milion years. The hydrothermal shear-controlled mineralisation occurring along the Singhbhum shear zone of Bihar and in the shears dissecting the Dongargarh system of Madhya Pradesh have a time-range of 1400-1600 million years. The next inferred period is between 1200 and 700 million years and includes the mineralisation episodes in the granulite mobile belt of the Southern Peninsular Shield, the Sarguja-Palamau area of the Chotanagpur migmatite-granulite belt and the Sikar-Dariba-Mahendragarh region in Rajasthan. Uranium mineralisation along the MCT region of Himalaya is of two periods, an early shear controlled disseminated mineralisation in the time range of 1200-1400 million years and a subsequent vein-type around 750 million years.
The distribution of geochemically enriched zones with special reference to uranium in space is controlled by many geological and regional factors arising from the styles or evolution of the Precambrian crust. These include-(i) The restriction of quartz-pebble conglomerates to the late Archaean crust and specific sedimentary environments of fluvial regimes, (ii) The paucity of uranium in the tonalite crust and its enrichment in K-rich granitoids wit11 higher Rb, (iii) depletion of uraniumin the granub ite crust and enrichment ia lower grade metamorphic belts and (iv) remobilisation and localisation of uranium deposits in major zones of crustal dislocation, especially along cratonic boundaries with mobile belts and within mobile belts. Recognition of these criteria helps in understanding the distribution of known belts of U enrichment and choosing areas for further exploration.
A comparison of the periods of uranium mineralisation with the suggested chelogenic cycles brings out a broad correlation, but such a relationship may prove to be rather limited when new discoveries of uranium are made especially of low grade ores, since chelogenic events are episodic, while crustal processes are continuous.
- Geology and Ore Mineralisation of the Singhbhum Copper-Uranium Belt, Eastern India
Authors
1 Atomic Minerals Division, Dept. of Atomic Energy, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 28, No 4 (1986), Pagination: 335-336Abstract
No Abstract.Full Text
- Gold in Laterite: A surprising challenge in metallogeny
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 33, No 6 (1989), Pagination: 594-594Abstract
No Abstract.Full Text
- Silver Jubilee of Gauribidanur Seismic Array
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 36, No 4 (1990), Pagination: 449-453Abstract
No Abstract.Full Text
- Indo-US Workshop on "Geomagnetism in Studies of the Earth's Interior" - Pune, India-22-26 August 1994
Authors
1 'Sree Bagh ', Amman Koil Road, Ernakulam, Kochi - 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 3 (1995), Pagination: 365-366Abstract
No Abstract.Full Text
- Volcanism-Radhakrishna Volume 1994
Authors
1 "Sree Bagh", Amman Koil Road, Ernakulam, Kochi-682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 5 (1995), Pagination: 615-616Abstract
No Abstract.Full Text
- Precambrian Geological and Structural Features of the Indian Peninsula
Authors
1 Sree Bagh, Ammankoil Road, Kochi - 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No Spl Iss 1 (2008), Pagination: 35-55Abstract
The Indian Peninsular Shield is an ensemble of differentially evolved Archaean-Early Proterozoic cratons, overlain by mid- to late Proterozoic platformal basins and more or less penecontemporaneous Proterozoic mobile belts with Archaean memories. There is a strong polarity in the trends of evolution of the Central cratonic block comprising the Dharwar, Bhandara-Bastar and Singhbhum-Orissa cratons encircled by the exhumed South Indian high-grade domain (SIHGD), the Eastern Ghat Mobile Belt (EGMB) and the Chotanagpur Gneissic Complex (CGC). In contrast, there is an overprinting of Proterozoic events on to the Archaean basement in the Satpura, Rajasthan and Shillong terrains. The litho-stratigraphy and structure of the different components of the Shield are outlined highlighting the magmatic episodes that punctuate the continental evolution. Current concepts of the evolution of the shield fall in the categories of both collision and non-collision models but are, however, fragmentary and in their infancy. Both the models appeal to the thermal energy of the mantle as the motivating force. A new dimension to such modeling may be provided when magmatism through time is integrated with tectonics and stratigraphy on the one hand and the evolving thermal and chemical regimes of the sub-crustal lithospheric and asthenospheric mantle on the other. A beginning has been made in this direction with regard to dyke swarms and some alkaline plutonites.Keywords
Precambrian Geology, Structural Features, Mobile Belts, Indian Shield.- Geology and Evolution of the Indian Plate (from Hadean to Holocene-4Ga to 4 Ka)
Authors
1 Cochin, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 1 (2006), Pagination: 133-136Abstract
No Abstract.Full Text
- General Path of the Tsunami of 26 December 2004
Authors
1 'Sree Bagh', Ammankoil road Ernakulam, Kochi - 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 3 (2005), Pagination: 373-374Abstract
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- Memoir 53 Indian Continental Lithosphere: Eemerging Research Trends
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Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 63, No 2 (2004), Pagination: 242-242Abstract
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- Geothermal Energy Resources for Developing Countries
Authors
1 Sree Bagh, Ammankoil Road, Kochi - 681 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 63, No 5 (2004), Pagination: 572-573Abstract
No Abstract.Full Text
- Principles of Radiometry in Radioactive Metal Exploration
Authors
1 Sreebagh, Ammankoil Road Ernakulam, Kochi - 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 5 (2004), Pagination: 707-708Abstract
No Abstract.Full Text
- Text Book Series 14: Geology of Bihar and Jharkhand
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 6 (2002), Pagination: 578-578Abstract
No abstract.Full Text
- Text Book Series 14: Geology of Bihar and Jharkhand
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Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 4 (2002), Pagination: 380-380Abstract
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- Tectonomagmatism, Geochemistry and Metamorphism of Precambrian Terrains
Authors
1 Sreebagh, Ammankovil Road Emakulam, Kochi 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 1 (2001), Pagination: 93-94Abstract
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- Precambrian Crustal Evolution and Mineralisation in India (PEM-2001 Seminar Volume)
Authors
1 Sreebagh, Arnrnankovil Road, Ernakularn, Kochi - 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 4 (2001), Pagination: 372-373Abstract
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- Seismic Imaging of Indian Continental and Oceanic Crust
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Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 2 (2010), Pagination: 190-192Abstract
No Abstract.Full Text
- Proceedings of the Seminar on "Earthquakes, Landslides: Natural Disaster and Mitigation"
Authors
1 Sree Bagh Ammankoil Road, Kochi - 682 035, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 4 (2000), Pagination: 455-456Abstract
No Abstract.Full Text
- Geology of Bihar and Jharkhand
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 1 (2002), Pagination: 66-66Abstract
No Abstract.Full Text
- Text Book Series 14: Geology of Bihar and Jharkhand
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 5 (2002), Pagination: 558-558Abstract
No Abstract.Full Text