Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2015 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : S2-09
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S2: Water Rock Interaction (Joint session with SRG)
Process of mineral compositional changes during brine activity under upper amphibolite facies conditions
*Fumiko HigashinoTetsuo KawakamiNoriyoshi TsuchiyaM. Satish-KumarMasahiro IshikawaGeoffrey GranthamShuhei SakataTakafumi Hitara
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Abstract

Ca. 1cm-thick Grt-Hbl vein discordantly cuts a gneissose structure of a Grt-Opx-Hbl gneiss in the central Sor Rondane Mountains, East Antarctica. Changes of mineral compositions and mineral assemblages with a distance from the vein suggest that the Grt-Hbl vein was formed by NaCl-KCl brine infiltration in open system under upper amphibolite facies conditions. Moreover, Zn-, Sr-, Ba-, Pb-, and U-contents in Hbl and Li-, Sr-, Ba-, and Pb-contents in Pl decrease with a distance from the vein. Trace elements compositional profiles with a distance from the vein imply the elements diffuse from the vein to the wall rock.

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© 2015 Japan Association of Mineralogical Sciences
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