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Petrographical indicators of petrogenesis: Examples from Central Indian Ocean Basin basalts

DRS at CSIR-National Institute of Oceanography

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Title Petrographical indicators of petrogenesis: Examples from Central Indian Ocean Basin basalts
 
Creator Mislankar, P.G.
Iyer, S.D.
 
Subject Central Indian Basin
basaltic pillows
 
Description Petrographical features of the Central Indian Basin (CIOB) basalts were studied to understand their genetic significance. The fresh basaltic pillows show three textural zones from the top glassy (zone A) through the intermediate (zone B) to the holocrystalline interior (zone C), with each characterised by varying assemblages of plagioclase and olivine that form different textures. Based on the presence and morphotypes of the plagioclase and olivine, the CIOB basalts are classified as aphyric, plagioclase dominant, plagioclase+olivine bearing and rarely plagioclase+olivine+augite bearing. The mineral phases and the textures reflect the magmatic conditions under which the basalts crystallised from a tholeiitic magma.
 
Date 2006-09-20T06:40:56Z
2006-09-20T06:40:56Z
2001
 
Type Journal Article
 
Identifier Indian Journal of Marine Sciences, vol.30(1), 1-8pp.
http://drs.nio.org/drs/handle/2264/400
 
Language en
 
Rights This digital version of the paper hosted with the permission from IJMS/NISCAIR.
http://www.niscair.res.in
 
Format 1733016 bytes
application/pdf
 
Publisher NISCAIR, CSIR