Contrasting metamorphic records and their implications for tectonic process in the central Sør Rondane Mountains, eastern Dronning Maud Land, East Antarctica

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

研究成果: ジャーナルへの寄稿記事

11 引用 (Scopus)

抄録

Metamorphic rocks in the central part of Sør Rondane Mountains, eastern Dronning Maud Land, East Antarctica, are classified into three types based on petrological characteristics. (i) The Austkampane area preserves c. 800oC and 0.5-0.6 GPa peak metamorphic conditions followed by decompression and subsequent isobaric cooling and later hydration (A-type). (ii) The Brattnipene and eastern Menipa area preserve peak P-T conditions of c. 800oC and 0.7- 0.8 GPa with subsequent isobaric cooling and later hydration (B-type). (iii) The area including Lunckeryggen, southern Walnumfjella and western Menipa preserves an amphibolite-facies peak metamorphic condition with signatures of prograde metamorphism (L-type), which are typically unaffected by the retrograde hydration event. Peak granulite-facies metamorphism of A- and B-type rocks are contemporaneous at c. 640-600 Ma, but a difference in the P-T paths between these rocks can be explained by thrusting of the A-type rock unit onto the B-type rock unit. By contrast, the timing of the metamorphism of the L-type rocks is significantly younger at c. 550 Ma, possibly related to the intrusion of pegmatites and granitoids. These metamorphic records in the central part of the Sør Rondane Mountains can be a test ground for the regional tectonic processes proposed for the orogeny related to Gondwana formation.

元の言語英語
ページ(範囲)113-133
ページ数21
ジャーナルGeological Society Special Publication
383
発行部数1
DOI
出版物ステータス出版済み - 12 16 2013

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Tectonics
Rocks
hydration
tectonics
mountain
Hydration
rock
metamorphism
A-type rock
cooling
prograde metamorphism
Metamorphic rocks
P-T conditions
Cooling
decompression
granulite facies
amphibolite facies
orogeny
Gondwana
metamorphic rock

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Geology

これを引用

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