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• W1981240895 abstract "The spatial variation in initial 87Sr/ 86Sr ratios (SrI) in the Toki granite, Central Japan, shows heterogeneity ranging from 0.708942 to 0.710069, which provides information on the intrusion and cooling processes of plutons. The Toki granite has three mineralogy-based rock facies: muscovite-biotite granite (MBG), hornblende-biotite granite (HBG) and biotite granite (BG). Large SrI values were found to be distributed at the western margin (west MBG) and the lithologically central region (central BG), while small SrI values were found at the northeast margin (northeast MBG). Regions with high and low Sr concentrations were also found in the Toki granite. In the Sr-rich samples, SrI (0.708942-0.709789) increases with 100/Sr (0.7-1.5). This geochemical trend extends towards the country sedimentary rocks of the Mino Terrane, which can be interpreted to result from assimilation and fractional crystallization (AFC) between the original granitic magma and the Mino sedimentary rocks. The SrI values in the Sr-rich regions show a correlation with the Alumina Saturation Index (ASI). In particular, the west MBG, with large SrI values, is classified as a peraluminous granitoid with large ASI, suggesting that the western margin of the pluton was strongly affected by assimilation during the intrusion process. The Sr-poor samples are present both in the central BG, with large SrI values, and in the northeast MBG, with small SrI values. The Sr-poor samples have small ASI and large differentiation indices, indicating that the central BG and the northeast MBG were generated either by different AFC process with different amounts of contaminants or by the intrusion and fractionation of different source magma with different SrI values. Overall, the geochemical spatial variations found in the Toki granite can be explained by various degrees of assimilation and fractional crystallization in the magma chamber and/or multi-stage intrusions with different degrees of crystallization of plural source magmas with different SrI values. Previous petrographical and thermochronological studies revealed that the Toki granite effectively cooled from the wall at the western margin in the cooling stage at temperatures below 500 °C. Larger SrI and ASI values found in this study corresponded to the western margins where the earlier and more rapid cooling took place, indicating that the Toki granite was preferentially cooled from the peraluminous marginal regions where the assimilation of country rock was the most extensive." @default.
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• W1981240895 date "2013-01-01" @default.
• W1981240895 modified "2023-09-25" @default.
• W1981240895 title "The spatial variation of initial 87Sr/86Sr ratios in the Toki granite, Central Japan: Implications for the intrusion and cooling processes of a granitic pluton" @default.
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• W1981240895 doi "https://doi.org/10.2465/jmps.120801b" @default.
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