Volcanic ash and its enigma: A case study from the Central Indian Ocean Basin

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dc.contributor.author Pattan, J.N.
dc.date.accessioned 2006-08-22T12:01:54Z
dc.date.available 2006-08-22T12:01:54Z
dc.date.issued 2002
dc.identifier.citation Journal Geological Society Of India, vol.60(2); 127-130pp.
dc.identifier.uri http://drs.nio.org/drs/handle/2264/242
dc.description.abstract An ash layer occurs between 10-35 cm depth in sediment cores from the Central Indian Ocean basin. Morphology, major, trace and rare earth element composition of glass shards from the ash layer suggest that the Youngest Toba Tuff of ~74 ka from Northern Sumatra may be its source. To understand the implication of ash on the elemental distribution, a sediment core (NR-54) where abundant Youngest Toba glass shards occur at 30-35 cm depth interval. was studied. The presence of ash layer resulted in the enrichment of coarse fraction (260%), Alexcess (104%), K (43%) and Al/Al + Fe+Mn (28%) and depletion of Mg (58%). Fe (55%) . Mn (50%) . Ti (44%) and biogenic opal (37%). compared to their average concentrations in the core. Therefore, precaution should be taken while studying the parameters indicative of productivity (biogenic opal, coarse fraction and Alexcess ). detrital terrigenous influx (Al/Al + Fe+Mn. Ti, K and Mg) and redox sensitive metal (Mn). whose concentration is affected by the presence of glass shards from the ash layer in the sediment cores from Bay of Bengal. Central Indian Ocean basin. South China Sea basin and Western continental margin of India where the widespread Youngest Toba ash is reported.
dc.format.extent 75086 bytes
dc.format.mimetype application/pdf
dc.language.iso en
dc.publisher Geological Society of India
dc.rights This digitized version of the paper hosted with the permission from Geological Society of India.
dc.subject Ash layer
dc.subject Glass shards
dc.subject Youngest Toba Tuff
dc.subject Indian Ocean
dc.subject Terrigenous influx
dc.title Volcanic ash and its enigma: A case study from the Central Indian Ocean Basin
dc.type Journal Article

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