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- W2056537930 abstract "Tourmalines of various chemical compositions, hosted in magmatic rocks with ages ranging from 3.8 Ga to the present were analysed for δ11B by ion microprobe. A large range of δ11B values, from − 2‰ to − 30 ± 1.5‰, was observed. The δ11B values are correlated with the chemical composition of the tourmalines, the Li-rich tourmalines being enriched in11B compared to Fe and/or Mg-rich tourmalines. This may reflect mixing in the continental crust between a marine reservoir characterized by high Li contents and δ11B values and a continental reservoir characterized by low Li contents and δ11B values. No relationship between the age and the δ11B values is observed for the Fe- or for the Mg-rich tourmalines. In contrast the δ11B values of the Li-rich tourmalines show a tendency to regularly decrease with increasing age. This pattern is consistent with a simple model of constant boron isotopic fractionation between seawater and the continental crust during the progressive extraction of the continents. A variation in the mean δ11B value of the continental crust, from ≈ − 20‰ Ga ago to ≈ − 7‰ at present, is predicted by the model. The largest variation occurred during the first 2.5 Ga." @default.
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- W2056537930 date "1992-02-01" @default.
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- W2056537930 title "Secular boron isotope variations in the continental crust: an ion microprobe study" @default.
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- W2056537930 doi "https://doi.org/10.1016/0012-821x(92)90025-q" @default.
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