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Anorthite megacrysts from island arc basalts

Published online by Cambridge University Press:  05 July 2018

Mitsuyoshi Kimata ,
Norimasa Nishida ,
Masahiro Shimizu ,
Shizuo Saito ,
Tomoaki Matsui  and
Yoji Arakawa
Mitsuyoshi Kimata
Affiliation:
Institute of Geoscience, The University of Tsukuba, Ibaraki 305, Japan
Norimasa Nishida
Affiliation:
Chemical Analysis Centre, The University of Tsukuba, Ibaraki 305, Japan
Masahiro Shimizu
Affiliation:
Institute of Geoscience, The University of Tsukuba, Ibaraki 305, Japan
Shizuo Saito
Affiliation:
Institute of Materials Sciences, The University of Tsukuba, Ibaraki 305, Japan
Tomoaki Matsui
Affiliation:
Institute of Geoscience, The University of Tsukuba, Ibaraki 305, Japan
Yoji Arakawa
Affiliation:
Institute of Geoscience, The University of Tsukuba, Ibaraki 305, Japan
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Abstract

Anorthite megacrysts are common in basalts from the Japanese Island Arc, and signally rare in other global fields. These anorthites are 1 to 3 cm in size and often contain several corroded Mg-olivine inclusions. The megacrysts generally range from An94Ab4Ot2 to An89Ab6Ot5 (Ot: other minor end-members, including CaFeSi3O8, CaMgSi3O8, AlAl3SiO8, □Si4O8) and show no chemical zoning. They often show parting. Redclouded megacrysts contain microcrystals of native copper with a distribution reminiscent of the shape of a planetary nebula. Hydrocarbons are also present, both in the anorthite megacrysts and in the olivines included within them. Implications of lateral variations in the Fe/Mg ratio of the included olivines, in Sr-content and in Sr-isotope ratio of the anorthite megacrysts with respect to the Japanese island arc, relate to mixing of crustal components and subducted slab-sediments into the basaltic magmas.

Keywords

anorthitemegacrystisland arcJapanbasalt
Type
Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 394 , March 1995 , pp. 1 - 14
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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