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Sukumaran, P. V.
- Aegirine Augite Syenite at Peralimala, Cannanore District, Kerala
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1 C/o Shri P. K. Krishnan, 'Lavanya', Cherpram, Nileshwar 670314, Kerala, IN
1 C/o Shri P. K. Krishnan, 'Lavanya', Cherpram, Nileshwar 670314, Kerala, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 1 (1983), Pagination: 54-56Abstract
The occurrence of aegirine augite bearing syenite of possible miaskitic character is reported from Kerala. Microcline, perthite, aegirine augite, sphene and melanitic garnet are the chief constituent minerals in the syenite. The Bavali lineament is believed to have provided the conduit for the emplacement of the syenite body.- Petrochemistry and Tectonic Significance of the Peralimala Alkali Granite, Cannanore District, Kerala
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Authors
Affiliations
1 Cherupuram, Nileshwar, Cannonore 670314, IN
1 Cherupuram, Nileshwar, Cannonore 670314, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 7 (1984), Pagination: 474-474Abstract
No Abstract.- Origin of Life: from Preblotic Chemistry to the first Replicating Molecule
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Authors
Affiliations
1 Geological Survey of India, Pune - 411 006, IN
1 Geological Survey of India, Pune - 411 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 5 (2005), Pagination: 649-653Abstract
No Abstract.- Characterisation of Late Pleistocene Tephra in Deep Sea Sediments of Arabian Sea
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Authors
Affiliations
1 Geological Survey of India, Op, Karnataka & Goa, Bangalore-560078
2 Geological Survey of India, Central Region, Seminary Hills, Nagpur-44006, IN
1 Geological Survey of India, Op, Karnataka & Goa, Bangalore-560078
2 Geological Survey of India, Central Region, Seminary Hills, Nagpur-44006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 1 (2002), Pagination: 79-88Abstract
Many sediment cores raised from the deep Arabian Sea, west of Lakshadweep Ridge, record the occurrence of 10-38 cm thick tephra layers, 35 to 195 cm below sea floor. These layers arc difficult, mainly due to admixing with biogenic debris, The non-carbonate coarse fraction of these tephra beds consists mostly of transparent fresh glass shards of K-rich, high silica rhyolitic composition, with some pumice fragments and crystals. The glass shard morphology is dominated by bubble wall type that often shows triple junctions. Individual analyses of glass shards from these volcanic ash layers is comparable to those of the proximal (Malaysia) and distal (Bay of Bengal and Indian subcontinent) tephra beds associated with the 75 ka Toba caldera cruption in north Sumatra. Characterisation on the basis of shard morphology and chemical composition demonstrates that all the tephra layers identified in the sediment cores from this study are correlative to the Youngest Toba Tuff. This new occurrence of youngest Toba ash layers in Arabiiin Sea, together with its identification further north in Murray Ridge and recent discovery of YTT glasses in the South China Sea and Central Indian Ocean Basin expand the previously known dispersal of Toba ash to much longer distances, both towards east and west from the source, and suggest that the volume of erupted magma was larger than the previously interpreted.Keywords
Tephra, Glass Shards, Chemistry, Toba Tuff, Arabian Sea.- Occurrence of Chromiferous Lodestone near Chalingal, Kasaragod District, Kerala
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Authors
Affiliations
1 Geological Survey of India, Geodata Division, Nagpur - 440 006, IN
2 Geological Survey of India, Op. Karnataka and Goa, Kumaraswamy Layout, Bangalore - 560 078, IN
1 Geological Survey of India, Geodata Division, Nagpur - 440 006, IN
2 Geological Survey of India, Op. Karnataka and Goa, Kumaraswamy Layout, Bangalore - 560 078, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 2 (2001), Pagination: 171-173Abstract
This communication reports the new find of chromiferous lodestone near Chalingal village in Kasaragod District of Kerala. The chemistry and mineralogy of the lodestone suggest that the band may have segregated during the early phase of magmatic differentiation.Keywords
Lodestone, Magmatic Differentiation, Ilmenite, Magnetite, Cumulus Texture.- New Frontiers of Deep-Sea Mineral Exploration and Mining
Abstract Views :186 |
PDF Views:149
Authors
Affiliations
1 Geological Survey of India, Mangalore, IN
1 Geological Survey of India, Mangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 6 (2010), Pagination: 871-873Abstract
No Abstract.- Lava Channel of Khedrai Dam, Northeast of Nasik in Western Deccan Volcanic Province: Detailed Morphology and Evidences of Channel Reactivation
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Authors
Affiliations
1 Geological Survey of India, Pune - 4110 06, IN
2 Geological Survey of India, Bhopal-462016, IN
3 Geological Survey of India, Mangalore - 575 001, IN
1 Geological Survey of India, Pune - 4110 06, IN
2 Geological Survey of India, Bhopal-462016, IN
3 Geological Survey of India, Mangalore - 575 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 3 (2012), Pagination: 314-328Abstract
The 120 m-wide Khedrai Dam lava channel is one of the widest recorded in the Deccan Volcanic Province. Like many recent ones, this channel also has a pair of linear marginal levees made of breccia and confines the channelfill lava. It is resting over a pahoehoe flow (substrate) of basalt studded with plagioclase megacrysts, also known as the Giant Plagioclase Basalt (GPB). The channel-fill lava, which makes the lining at the edges and basal portion of the channel, is a comb-layered basalt (Cl-B) characterized by alternating layers rich in curved, branching augite crystals and laths of plagioclase - a texture indicative of high order of supercooling and rapid cooling rates. The dominant and centrally filling lava of this channel is a plagioclase-phyric basalt (Pp-B) that has a wide variation in phenocryst number from megacryst-poor to megacryst-rich. Occurrence of centimetre to decimetre size angular fragments of Cl-B within Pp-B fill indicates mechanical dislodgements of channel-lining by flowing lava. This also suggests that the channel was reactivated before it finally lost its hydraulic gradient and solidified.Keywords
Deccan Volcanic Province, Lava Channel, Comb Layered Basalt, Channel Reactivation.References
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- Elements that Rule the World: Impending REE Metal Crisis
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Authors
Affiliations
1 Geological Survey of India, "Sukrutham", Ambika Road, Mangalore - 575 022, IN
1 Geological Survey of India, "Sukrutham", Ambika Road, Mangalore - 575 022, IN