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Morphology and chemical composition of ash layer of about 8 Ma old from ODP-758 site, Bay of Bengal

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Title Morphology and chemical composition of ash layer of about 8 Ma old from ODP-758 site, Bay of Bengal
 
Creator Jumaila, C P Ummu
Pattan, J N
Ahmad, S M
Parthiban, G
Khedekar, V D
Padmakumari, V M
Milindraj, P
 
Subject Ash layer
8 Ma
Bay of Bengal
ODP-758
Rhyolitic
Magmatic
Volcanic arc
Indonesian arc volcanism
 
Description 871-876
Glass shards from an ash layer of about 8 Ma old extracted from a core drilled at an ODP-758 site in the Bay of Bengal (BOB) were studied for morphology and chemical composition in order to trace their possible source. Glass shards are of bubble wall, platy and pumice shard type indicating magmatic type of eruption. Electron probe micro analysis (EPMA) of glass shards suggesta rhyolite composition and high K cal-alkaline series. FeO (1.23%) and TiO2 (0.1%) contents of these glass shards are distinctly higher compared to the earlier known Youngest (~74 ka), Middle (~0.54 Ma) and Oldest (~0.84 Ma) Toba Tuffs. Tectonomagmatic, triangular (Ti-Zr-Y) plot and chondrite- normalized REE pattern, are all indicative of volcanic arc source most probably from the nearby Indonesian arc volcanism.
 
Date 2017-05-08T10:07:50Z
2017-05-08T10:07:50Z
2017-05
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/41679
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.46(05) [May 2017]