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Rare-earth distribution in alkali rocks from Oki-Dogo Island, Japan

โœ Scribed by Hiroshi Nagasawa

Publisher
Springer
Year
1973
Tongue
English
Weight
505 KB
Volume
39
Category
Article
ISSN
0010-7999

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โœฆ Synopsis

Rare-earth, Sr and Ba abundances were determined for three basalts, one mugearite, one trachyandesite and five trachytes from Dogo, Oki Islands, Japan and Ca-rich clinopyroxene and feldspar phenocryst samples separated from them. It is concluded that rareearth, Sr and Ba abundance patters for basalts and three trachytes could be explained by crystallization differentiation of olivine basalt magma, while those for other samples suggest more complicated process of magma production. Calculated Eu 2+ to total Eu ratios in the magmas showed a increasing trend with differentiation. It is found that Yb and Lu partition coefficients were larger than those of lighter rare earths for clinopyroxenes in trachytes suggesting preferential substitution of the heavy rare-earth ions for Mg-site in the clinopyroxenes.

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