Late Cretaceous CHIME monazite ages of Sanbagawa metamorphic rocks from Nushima, Southwest Japan
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- SUZUKI Kazuhiro
- Institute for Space–Earth Environmental Research, Nagoya University
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- ENAMI Masaki
- Institute for Space–Earth Environmental Research, Nagoya University
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- MAEKAWA Hirokazu
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University
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- KATO Takenori
- Institute for Space–Earth Environmental Research, Nagoya University
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- UENO Tomoko
- Department of Earth and Planetary Sciences, Kobe University
Abstract
<p>The Sanbagawa metamorphic rocks of epidote–amphibolite facies are extensively exposed in Nushima at the southern end of the Hyogo Prefecture, Japan. Chemical U–Th–total Pb isochron method (CHIME) ages were determined for monazite grains from the Sanbagawa metamorphic rocks. CHIME monazite ages are 92.3 ± 3.2 and 90.3 ± 4.7 Ma for two chlorite–rich rocks collected from the reaction zone between pelitic schists and serpentinites. The monazite grains occur as isolated phases or aggregates with rutile/ilmenite in chlorite–rich matrix, and thus the CHIME monazite ages are interpreted to represent recrystallization close to the peak stage of prograde epidote–amphibolite facies metamorphism. Considering the U–Pb zircon ages reported in literature, the main stage of Sanbagawa prograde metamorphism up to the epidote–amphibolite facies is estimated to have been at 80–92 Ma. Comparison of the age data between the Sanbagawa eclogite and epidote–amphibolite facies stages suggests the possibility that the formation of eclogite facies rocks at different depths and periods of the Sanbagawa subduction continued for more than 20–30 million years.</p>
Journal
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 113 (1), 1-9, 2018
Japan Association of Mineralogical Sciences
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Details 詳細情報について
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- CRID
- 1390001206546626432
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- NII Article ID
- 130006407101
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- ISSN
- 13493825
- 13456296
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed