著者
Keiko MORI Tatsuki TSUJIMORI Nelson BONIFACE
出版者
Japan Association of Mineralogical Sciences
雑誌
Journal of Mineralogical and Petrological Sciences (ISSN:13456296)
巻号頁・発行日
vol.113, no.6, pp.316-321, 2018 (Released:2018-12-29)
参考文献数
43
被引用文献数
1 2

We report a newly discovered assemblage of talc–kyanite in an amphibolite from the Isimani Suite of the Paleoproterozoic Usagaran Belt, central Tanzania. The amphibolite is characterized by the mineral assemblage of clinoamphibole, kyanite, talc with minor rutile, quartz, dolomite, and rare barite. The high Fe3+/(Fe3+ + Fe2+) ratio (0.48–0.80) of clinoamphibole and the presence of sulfate (barite) indicate a very–high oxidation state during metamorphism. P–T pseudosection modelling predicts that the studied talc– and kyanite–bearing amphibolites formed at high–pressure conditions (P > 1.0 GPa). Moreover, the modelling suggests formation of talc + kyanite + clinoamphibole at a highly oxidizing condition with CO2 fluid. This talc–kyanite association provides an index of high–pressure metamorphism of the Usagaran Belt and marks the oldest record of the talc–kyanite association in regional metamorphism in the Earth’s history.

言及状況

外部データベース (DOI)

Twitter (3 users, 3 posts, 4 favorites)

付近の角閃岩からは鉱物組合せ滑石+藍晶石が見出され、ウサガラン帯の高圧変成が示された。 Mori, K., Tsujimori, T., and Boniface, N. (2018) Finding of talc- and kyanite-bearing amphibolite from the Paleoproterozoic Usagaran Belt, Tanzania. JMPS, 113, 316–321. https://t.co/K30m4fFKy0 https://t.co/nCiVKG23dS
https://t.co/Vejsc0Jiid https://t.co/lCcZCCKzH8 https://t.co/H7TK0v8cPn https://t.co/w8zoGBNuLP https://t.co/WOyhp49BvN https://t.co/LimaYZ6UA2 https://t.co/GTI1K7PuZt

収集済み URL リスト