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- W4255087678 abstract "The magmatism at the axial zone of the middle Okinawa Trough, a young continental back-arc basin, comprises a bimodal basaltic-rhyolitic suite, accompanied by minor intermediate rocks. We report major and trace element and Sr-Nd isotopie data for the intermediate to silicic suites, to provide constraints on their petrogenesis. The rhyolites, recovered as lava and pumice, fall into three geochemical groups (type 1, 2, and 3 rhyolites). Type 1 rhyolites have 87Sr/86Sr (0.7040–0.7042) and 143Nd/144Nd (0.5128–0.5129) identical to those of associated basalts, and are characterized by highly fractionated REE patterns. Petrogenesis of type 1 rhyolites is explicable in terms of fractional crystallization of the associated basalt. In contrast, type 2 rhyolites and andesite have slightly higher 87Sr/86Sr (0.7044–0.7047) but similar 143Nd/144Nd (0.5128) compared to those of the basalts. The compositions of type 2 rhyolite and andesite can be explained by assimilation and fractional crystallization (AFC) processes of the basalt magma; quantitative analysis suggests assimilation/fractional crystallization (Ma/Mc) ratios of ≤ 0.05. Hybrid andesite generated by mixing of evolved basalt and type 1 rhyolite is also present. We emphasize that mechanical extension in this part of the Okinawa Trough involves gabbro ic lower crust that resulted from fractionation of mantle-derived basaltic magmas. Type 3 rhyolite occurs only as pumice, which makes its derivation questionable. This rhyolite has major and trace element compositions and Sr–Nd isotopie ratios, which suggests that it may be derived from volcanic activity on the southern Ryukyu volcanic front, and arrived in the Okinawa Trough by drifting on the Kuroshio Current." @default.
- W4255087678 created "2022-05-12" @default.
- W4255087678 date "1989-01-01" @default.
- W4255087678 modified "2023-09-26" @default.
- W4255087678 title "Metastable bismuth-iron alloy films synthesized with ion mixing and magnetron copsuttering" @default.
- W4255087678 doi "https://doi.org/10.1016/0042-207x(89)90949-4" @default.
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