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Petrology of the prehistoric lavas and dyke of the Barren Island, Andaman Sea, Indian ocean

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Title Petrology of the prehistoric lavas and dyke of the Barren Island, Andaman Sea, Indian ocean
 
Creator ALAM, MA
CHANDRASEKHARAM, D
VASELLI, O
CAPACCIONI, B
MANETTI, P
SANTO, PB
 
Subject chemical classification
volcanic-rocks
barren island
lava flows
dyke
petrology
sunda arc
 
Description Although Barren Island (Andaman Sea, Indian Ocean) witnessed several volcanic eruptions during historic times, the eruptions that led to the formation of this volcanic island occurred mainly during prehistoric times. It is still active and currently in the fumarolic stage. Its volcanic evolution appears to be characterized by a constructive phase with the piling up of lava flows and scoria deposits and Strombolian activities, followed by a sudden collapse of the main cone. Deposits of a possible caldera-forming eruption were not recognized earlier. After a period of peri-calderic hydromagmatic activity, whose deposits presently mantle inner and outer caldera walls, a new phase of intra-calderic Vulcanian activities took place. A prominent dyke in the SE inner side of the caldera wall was recognized. Petrographically the lava flows and dyke are similar but they differ in their chemical composition (viz., SiO2, MgO, Ni, Cr) significantly. Similarity in major, minor and trace element composition (viz., K/La, K/Nb, K/Rb, K/Ti ratios) of these rocks together with Chondrite normalized trace element (Rb, Ba, Sr, P, Zr, Ti and Nb) and REE (La, Ce, Nd and Y) patterns of the Barren Island prehistoric lava flows and dyke and low-K lavas of Sunda Arc indicates that Barren Island must have evolved from a source similar to that of Sunda Arc lavas during the Quaternary Period.
 
Publisher INDIAN ACADEMY SCIENCES
 
Date 2011-08-02T06:29:16Z
2011-12-26T12:53:44Z
2011-12-27T05:40:43Z
2011-08-02T06:29:16Z
2011-12-26T12:53:44Z
2011-12-27T05:40:43Z
2004
 
Type Article
 
Identifier PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-EARTH AND PLANETARY SCIENCES, 113(4), 715-721
0253-4126
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8690
http://hdl.handle.net/10054/8690
 
Language en