Origin of xenoliths within the Hime–shima volcanic group, Kyushu, southwestern Japan Arc
Granitic and gabbroic xenoliths have been found within dacitic lavas in the Hime–shima volcanic group (HVG) of northeastern Kyushu, Japan. The HVG is located near the boundary between the Ryoke and Sangun belts, suggesting that the HVG and associated crustal xenoliths may provide insights into the s...
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Veröffentlicht in: | Journal of Mineralogical and Petrological Sciences 2022, Vol.117(1), pp.211217b |
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Sprache: | eng |
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Zusammenfassung: | Granitic and gabbroic xenoliths have been found within dacitic lavas in the Hime–shima volcanic group (HVG) of northeastern Kyushu, Japan. The HVG is located near the boundary between the Ryoke and Sangun belts, suggesting that the HVG and associated crustal xenoliths may provide insights into the subsurface distribution of the Ryoke and Sangun belts in Kyushu. This study focuses on xenoliths obtained from the coastal boulders near the Kane Lava of the HVG. The HVG xenoliths consist of gabbro, gabbroic diorite, amphibolite, gneiss, basaltic andesite, and tuffaceous sandstone, with the latter two types resembling those found in the basement rocks of the HVG. The gabbroic xenoliths are geochemically similar to gabbros in the Ryoke belt. The U–Pb dating for zircon in the gneiss xenoliths yielded a metamorphic age of ~ 111 Ma with Th/U values |
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ISSN: | 1345-6296 1349-3825 |
DOI: | 10.2465/jmps.211217b |