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Petrological Characteristics and Genesis of the Central Indian Ocean Basin Basalts

DRS at CSIR-National Institute of Oceanography

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Title Petrological Characteristics and Genesis of the Central Indian Ocean Basin Basalts
 
Creator Das, P.
Iyer, S.D.
Hazra, S.
 
Subject basalts
petrology
 
Description The Central Indian Ocean Basin (CIOB) basalts are plagioclase-rich, while olivine and pyroxene are very few. The analyses of 41 samples reveal high FeO sup(T) (approx. 10-18 wt percent) and TiO sub(2) (approx. 1.4-2.7 wt percent) indicating a ferrobasaltic composition. The basalts have high incompatible elements (Zr 63-228 ppm; Nb approx. 1-5 ppm; Ba approx. 15-78 ppm; La approx. 3-16 ppm), a similar U/Pb (0.02-0.4) ratio as the normal mid-oceanic basalt (0.16 plus or minus 0.07) but the Ba/Nb (12.5-53) ratio is much larger than that of the normal mid-oceanic ridge basalt (approx. 5.7) and Primitive Mantle (9.56). Interestingly almost all of the basalts have a significant negative Eu anomaly (Eu/Eu*=0.78-1.00) that may have been a result of the removal of feldspar and pyroxene during crystal fractionation. These compositional variations suggest that the basalts were derived through fractional crystallization together with low partial melting of a shallow seated magma.
 
Date 2012-12-05T06:11:29Z
2012-12-05T06:11:29Z
2012
 
Type Journal Article
 
Identifier Acta Geologica Sinica, vol.86(5); 2012; 1154-1170
no
http://drs.nio.org/drs/handle/2264/4200
 
Language en
 
Relation Acta_Geol_Sin_86_1154.jpg
 
Rights An edited version of this paper was published by Springer/Geological Society of China. This paper is for R & D purpose and Copyright [2012] Springer.
 
Publisher Geological Society of China