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Tectono-metamorphic evolution and significance of shear-zone lithologies in Akebono Rock, Lützow-Holm Complex, East Antarctica

Published online by Cambridge University Press:  09 October 2020

Sotaro Baba Open the ORCID record for Sotaro Baba [Opens in a new window] ,
Tomokazu Hokada ,
Atsushi Kamei ,
Ippei Kitano ,
Yoichi Motoyoshi ,
Prayath Nantasin ,
Nugroho Imam Setiawan  and
Davaa-Ochir Dashbaatar
Sotaro Baba*
Affiliation:
Department of Science Education, University of the Ryukyus, Okinawa 903-0213, Japan
Tomokazu Hokada
Affiliation:
National Institute of Polar Research, Tokyo 190-8518, Japan Department of Polar Science, The Graduate University for Advanced Studies (SOKENDAI), Tokyo190-8518, Japan
Atsushi Kamei
Affiliation:
Department of Geosciences, Shimane University, Matsue, Shimane 690-8504, Japan
Ippei Kitano
Affiliation:
Division of Earth Sciences, Faculty of Social and Cultural Studies, Kyushu University, Fukuoka 819-0395, Japan
Yoichi Motoyoshi
Affiliation:
National Institute of Polar Research, Tokyo 190-8518, Japan
Prayath Nantasin
Affiliation:
Department of Earth Sciences, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
Nugroho Imam Setiawan
Affiliation:
Geological Engineering Department, Engineering Faculty, Universitas Gadjah Mada, DI Yogyakarta 55281, Indonesia
Davaa-Ochir Dashbaatar
Affiliation:
Mongolian University of Science and Technology Ulaanbaatar 14191, Mongolia
*
baba@edu.u-ryukyu.ac.jp
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Abstract

We describe a major shear zone exposed at Akebono Rock and discuss its deformation and metamorphic history, with a view to providing a better understanding of the geological history of the Lützow-Holm Complex. Three deformation episodes are recognized: D1 produced open folds (F1), boudinage and a regional ductile foliation, whilst the related metamorphic facies is characterized by stable garnet. F1 folding is dominantly preserved in the eastern part of the study area. During D2, an isoclinal to tight asymmetric F2 folds developed mainly in the west part of the region, accompanied by an S2 shear, under biotite facies retrograde metamorphism. The D3 episode involved the formation of the major shear zone, characterized by mylonite and L-tectonite fabrics, which took place at ~610–660°C and 4–5 kbar. Large, sigmoidal garnet core domains have S-shaped inclusion trails, suggesting that syntectonic garnet growth occurred before the formation of the shear zone. Estimated P-T conditions suggest that the sigmoidal garnet-bearing amphibolite was recrystallized at a deeper crustal level and was brought to a higher level during the formation of the shear zone. Crustal-scale deformation involving syntectonic recrystallization and shearing of Akebono Rock is a key issue for reconsidering the evolution of the Lützow-Holm Complex.

Keywords

L-tectonitemyloniteP-T-d pathsigmoidal garnet
Type
Earth Sciences
Information
Antarctic Science , Volume 33 , Issue 1 , February 2021 , pp. 52 - 72
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Copyright
Copyright © Antarctic Science Ltd 2020

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