Origin of zircon in jadeitite from the Nishisonogi metamorphic rocks, Kyushu, Japan

Origin of zircon in jadeitite from the Nishisonogi metamorphic rocks, Kyushu, Japan

On the basis of internal structures, laser ablation U–Pb ages and trace element compositions, the origin of zircon in jadeitite in the Nishisonogi metamorphic rocks was examined. The zircon comprises euhedral zoned cores overgrown by euhedral rims. The cores contain inclusions of muscovite, quartz,...

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Veröffentlicht in:Journal of metamorphic geology 2011-08, Vol.29 (6), p.673-684
Hauptverfasser: MORI, Y., ORIHASHI, Y., MIYAMOTO, T., SHIMADA, K., SHIGENO, M., NISHIYAMA, T.
Format: Artikel
Sprache:eng
Schlagworte:
Crystallization
Geochemistry
jadeitite
Metamorphic rocks
Mineralogy
Minerals
Nishisonogi metamorphic rocks
trace element composition
U-Pb age
zircon
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Zusammenfassung:On the basis of internal structures, laser ablation U–Pb ages and trace element compositions, the origin of zircon in jadeitite in the Nishisonogi metamorphic rocks was examined. The zircon comprises euhedral zoned cores overgrown by euhedral rims. The cores contain inclusions of muscovite, quartz, albite and possibly K‐feldspar, yield 238U–206Pb ages of 126 ± 6 Ma (±2 SD, n = 45, MSWD = 1.0), and have Th/U ratios of 0.48–1.64. The rims contain inclusions of jadeite, yield 238U–206Pb ages of 84 ± 6 Ma (±2 SD, n = 14, MSWD = 1.1), and have Th/U ratios of
ISSN:0263-4929
1525-1314
DOI:10.1111/j.1525-1314.2011.00935.x