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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Sukumaran, P. V.

Aegirine Augite Syenite at Peralimala, Cannanore District, Kerala

Petrochemistry and Tectonic Significance of the Peralimala Alkali Granite, Cannanore District, Kerala

Origin of Life: from Preblotic Chemistry to the first Replicating Molecule

Characterisation of Late Pleistocene Tephra in Deep Sea Sediments of Arabian Sea

Abstract Views :180 | PDF Views:2

Authors

A. R. Nambiar ¹, P. V. Sukumaran ²

Affiliations
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: 79-88

Abstract

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.

Full Text

Occurrence of Chromiferous Lodestone near Chalingal, Kasaragod District, Kerala

New Frontiers of Deep-Sea Mineral Exploration and Mining

Lava Channel of Khedrai Dam, Northeast of Nasik in Western Deccan Volcanic Province: Detailed Morphology and Evidences of Channel Reactivation

Abstract Views :845 | PDF Views:1

Authors

Bibhas Sen ¹, A. B. Sabale ², P. V. Sukumaran ³

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

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 3 (2012), Pagination: 314-328

Abstract

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.

Full Text

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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Author Details

Sukumaran, P. V.

Aegirine Augite Syenite at Peralimala, Cannanore District, Kerala

Authors

Source

Abstract

Full Text

Petrochemistry and Tectonic Significance of the Peralimala Alkali Granite, Cannanore District, Kerala

Authors

Source

Abstract

Full Text

Origin of Life: from Preblotic Chemistry to the first Replicating Molecule

Authors

Source

Abstract

Full Text

Characterisation of Late Pleistocene Tephra in Deep Sea Sediments of Arabian Sea

Authors

Source

Abstract

Keywords

Full Text

Occurrence of Chromiferous Lodestone near Chalingal, Kasaragod District, Kerala

Authors

Source

Abstract

Keywords

Full Text

New Frontiers of Deep-Sea Mineral Exploration and Mining

Authors

Source

Abstract

Full Text

Lava Channel of Khedrai Dam, Northeast of Nasik in Western Deccan Volcanic Province: Detailed Morphology and Evidences of Channel Reactivation

Authors

Source

Abstract

Keywords

Full Text

References

Elements that Rule the World: Impending REE Metal Crisis

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