Thermal metamorphism of volcanic rocks on Barton Peninsula, King George Island, Antarctica
SCOPUS
KCI
OTHER
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Title
- Thermal metamorphism of volcanic rocks on Barton Peninsula, King George Island, Antarctica
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Author(s)
- Kim, H.; Cho, M.; Lee, J.-I.
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Alternative Author(s)
- 이종익
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Publication Year
- 2002
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Abstract
- Barton Peninsula is mainly composed of Tertiary metavolcanic rocks and granodiorite. The metavolcanic rocks underwent thermal metamorphism up to upper greenschist facies, producing calcic-amphibole (Amp), epidote, chlorite (Chl), calcite (Cc), plagioclase, prehnite and laumontite. Two metamorphic zones, Cc-Chl and Amp-Chl, are defined on the basis of mineral assemblages (+plagioclase, quartz, opaque minerals), characterized by epidote+chlorite±calcite and actinolite± hornblende+epidote+chlorite ±calcite, respectively. The distribution coefficient of Mg-Fe* (total Fe) between actinolite and chlorite, defined by KD=(Mg/Fe*)Act/(Mg/ Fe*)Chl, ranges from 0.56 to 1.03, suggesting low-pressure metamorphism. The coexistence of actinolite and oligoclase also supports low-pressure metamorphism. Chlorite geothermometry and T-XCO2 analysis suggest that metamorphic temperatures reached ca. 300°C at fluid pressures less than 1 kbar. Thermal metamorphism in Barton Peninsula probably was associated with magmatic-arc plutons emplaced during the Tertiary subduction of the southeast Pacific plate under Antarctic Peninsula.
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ISSN
- 1226-4806
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/5770
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DOI
- 10.1007/BF03020615
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Bibliographic Citation
- Geosciences Journal, v.6, no.4, pp.303 - 317, 2002
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Publisher
- Korean Association of Geoscience Societies
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Keywords
- Antarctic Peninsula; Barton Peninsula; Low-pressure metamorphism; Thermal metamorphism
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Type
- Article
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Language
- English
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Document Type
- Article
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