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Contrasting geological background based on the geochemistry of the mafic metamorphic rocks in central Dronning Maud Land
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- Baba, Sotaro
- Department of Science Education, University of the Ryukyus
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- Owada, Masaaki
- Department of Earth Sciences, Yamaguchi University
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- Hokada, Tomokazu
- National Institute of Polar Research
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- Adachi, Tatsuro
- Faculty of Social and Cultural Studies, Kyushu University
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- Nakano, Nobuhiko
- Faculty of Social and Cultural Studies, Kyushu University
Bibliographic Information
- Published
- 2023-03-20
- Resource Type
- journal article
- Rights Information
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- This article is licensed under a CC BY-NC-ND License.
- DOI
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- 10.1017/s0016756823000092
- Publisher
- Cambridge University Press
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Description
This paper reports geochemical characteristics of mafic gneisses and granulites collected from four localities in central Dronning Maud Land to evaluate the tectonic setting of their precursor rocks. Precursor rocks for the mafic gneisses and granulites in central Dronning Maud Land were formed in different geological backgrounds and tectonic settings. The mafic gneisses and granulites in the Schirmacher Hills were derived from basaltic rocks in a back-arc setting. Published U–Pb zircon ages and the geochemical variation of the basement rocks indicate their emplacement between 800 and 650 Ma, close to peak metamorphism. While similar protoliths were recognized in the inland nunataks of Hochlinfjellet, in Filchnerfjella the mafic gneisses/granulites were derived from basaltic rocks formed in marginal continental arcs or island arcs. Highly disturbed trace-element patterns indicate that the metamorphic process influenced the geochemical composition during the prograde metamorphic stage. Our results imply that the outcrops in central Dronning Maud Land with different metamorphic ages contain mafic gneisses/granulites from precursor rocks formed under different tectonic settings.
Journal
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- Geological Magazine
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Geological Magazine 160 993-1009, 2023-03-20
Cambridge University Press
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Details 詳細情報について
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- CRID
- 1050584708068009984
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- ISSN
- 14695081
- 00167568
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- HANDLE
- 20.500.12000/0002021089
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- Crossref
- KAKEN
