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Nd and Sr isotopic variations in acidic rocks from Japan: significance of upper-mantle heterogeneity

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Abstract

Initial Nd and Sr isotopic ratios have been measured for Cretaceous acidic and related intermediate rocks (24 volcanic and two plutonic rocks) from the Inner Zone of Southwest Japan (IZSWJ) to investigate the genesis of acidic magmas. The initial Nd and Sr isotopic ratios for these rocks show three interesting features: (1) ε Nd values for acidic rocks (+2 to −9) are negatively correlated with ε Sr values (+10 to +90) together with those for intermediate rocks (ε Nd=+3 to -8; ε Sr=0 to +65). (2) The ε Nd values for silica rich rocks (>60% SiO2) correlate with the longitude of the sample locality, decreasing from west to east in a stepwise fashion: Four areas characterized by uniform ε Nd values are discriminated. (3) Low silica rocks (<60% SiO2) in a certain area have distinctly different ε Nd values from those of the high silica rocks in the same area.

These results as well as those deduced from the additional samples collected, for comparison, from other provinces in Japan suggest that the acidic rocks can be formed neither by fractional crystallization processes from more basic magmas nor by crustal assimilation processes. The isotopic variations of the acidic rocks may reflect regional isotopic heterogeneity in the lower crust, and this heterogeneity may ultimately be attributed to the regional heterogeneity of the uppermost-mantle beneath the Japanese Islands.

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Terakado, Y., Nakamura, N. Nd and Sr isotopic variations in acidic rocks from Japan: significance of upper-mantle heterogeneity. Contr. Mineral. and Petrol. 87, 407–417 (1984). https://doi.org/10.1007/BF00381297

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