Inferred ultrahigh-temperature metamorphism of amphibolitized olivine granulite from the Sør Rondane Mountains, East Antarctica

Nobuhiko Nakano, Yasuhito Osanai, Sotaro Baba, Tatsuro Adachi, Tomokazu Hokada, Tsuyoshi Toyoshima

研究成果: ジャーナルへの寄稿記事

13 引用 (Scopus)

抄録

This paper reports the first evidence of ultrahigh-temperature (UHT) metamorphism from the Sør Rondane Mountains, eastern Dronning Maud Land, East Antarctica, which is evident as orthopyroxene. +. spinel symplectite in an amphibolitized mafic granulite. The granulite consists of olivine, orthopyroxene, clinopyroxene, pargasitic amphibole, plagioclase, and ilmenite, and it possesses a within-plate alkali basalt signature. The local bulk chemical composition of symplectite, major and trace element compositions, and thermodynamic calculations for the symplectite, suggest the presence of garnet at the high-pressure stage and that the symplectite formed from garnet, olivine, and primary orthopyroxene by decompression from more than 12. kbar at 1000°C. The granulite records a subsequent amphibolite-facies overprint (<700°C at <6. kbar) that involved the chemical re-equilibration of several phases. The obtained pressure-temperature (P-T) conditions and P-T path are different from the UHT metamorphism from the Schirmacher Hills, central Dronning Maud Land, which is considered to have occurred in a back-arc tectonic setting. The relatively high-P conditions and the decompression path reconstructed in the present study are similar to those reported for southern India, Sri Lanka, and part of northeastern Mozambique, possibly reflecting continental thickening and exhumation during the main collision event between East and West Gondwana.

元の言語英語
ページ(範囲)345-359
ページ数15
ジャーナルPolar Science
5
発行部数3
DOI
出版物ステータス出版済み - 9 1 2011

Fingerprint

ultrahigh temperature metamorphism
symplectite
granulite
Antarctica
olivine
orthopyroxene
mountains
mountain
decompression
garnet
temperature
plagioclase
basalt
Mozambique
alkali basalt
Sri Lanka
tectonics
ilmenite
amphibolite facies
alkalis

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology
  • Earth and Planetary Sciences(all)

これを引用

Inferred ultrahigh-temperature metamorphism of amphibolitized olivine granulite from the Sør Rondane Mountains, East Antarctica. / Nakano, Nobuhiko; Osanai, Yasuhito; Baba, Sotaro; Adachi, Tatsuro; Hokada, Tomokazu; Toyoshima, Tsuyoshi.

:: Polar Science, 巻 5, 番号 3, 01.09.2011, p. 345-359.

研究成果: ジャーナルへの寄稿記事

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