Show simple item record

dc.contributor.authorDas, P.
dc.contributor.authorIyer, S.D.
dc.contributor.authorHazra, S.
dc.date.accessioned2012-12-05T06:11:29Z
dc.date.available2012-12-05T06:11:29Z
dc.date.issued2012
dc.identifier.citationActa Geologica Sinica, vol.86(5); 2012; 1154-1170
dc.identifier.otherno
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/4200
dc.description.abstractThe 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.
dc.language.isoen
dc.publisherGeological Society of China
dc.relation.requiresActa_Geol_Sin_86_1154.jpg
dc.rightsAn edited version of this paper was published by Springer/Geological Society of China. This paper is for R & D purpose and Copyright [2012] Springer.
dc.subjectbasalts
dc.subjectpetrology
dc.titlePetrological Characteristics and Genesis of the Central Indian Ocean Basin Basalts
dc.typeJournal Article


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record