Metamorphic pressure–temperature conditions of the Lützow–Holm Complex of East Antarctica deduced from Zr–in–rutile geothermometer and Al<sub>2</sub>SiO<sub>5</sub> minerals enclosed in garnet
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- SUZUKI Kota
- Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
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- KAWAKAMI Tetsuo
- Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
Bibliographic Information
- Other Title
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- Metamorphic pressure–temperature conditions of the Lützow-Holm Complex of East Antarctica deduced from Zr-in-rutile geothermometer and Al2SiO5 minerals enclosed in garnet
Abstract
<p>The metamorphic pressure–temperature (P–T) conditions of high–grade pelitic gneisses from Akarui Point, Skarvsnes, Skallen, and Rundvågshetta in the Lützow–Holm Complex (LHC), East Antarctica are re–examined by applying the Zr–in–rutile geothermometer to rutile inclusions in garnet enclosing Al2SiO5 minerals and to matrix rutile grains. By utilizing the P zoning of garnet to indicate isochronous surface, samples from Akarui Point, Skarvsnes, and Skallen were shown to have experienced almost the same P–T conditions around the kyanite/sillimanite transition boundary (~ 830–850 °C/~ 11 kbar). From Rundvågshetta, higher–T condition (850 ± 15 °C/0.1 kbar to 927 ± 16 °C/12.5 kbar) was confirmed from rutile inclusions in garnet enclosing sillimanite. Matrix rutile yielded similar temperature as inclusion rutile for Akarui Point, Skarvsnes, and Skallen samples. Therefore, the traditional metamorphic zone mapping based on matrix mineral assemblages, which classified Akarui Point as belonging to the transitional zone between the upper–amphibolite and the granulite facies zones, does not reflect the highest metamorphic conditions attained. The P–T–t evolution of the LHC needs to be re–evaluated utilizing detailed petrochronological approaches.</p>
Journal
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 114 (6), 267-279, 2019
Japan Association of Mineralogical Sciences
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Details 詳細情報について
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- CRID
- 1390846609798179328
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- NII Article ID
- 130007789009
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- ISSN
- 13493825
- 13456296
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- HANDLE
- 2433/287367
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed