Abstract
GOLDSCHMIDT has pointed out1 that during the cooling of an igneous magna the earliest formed calcium minerals would be poor in strontium relative to calcium while later calcium minerals would show a progressively higher proportion of strontium to calcium. In his opinion this would be so because the calcium ions would be taken into the crystal lattice in preference to strontium, because they were more abundant and because they had a smaller ionic radius and would form a stronger bond. Other workers2,3 have shown that the ratio of strontium : calcium in plagioclases does increase as calcium decreases with fractionation in certain igneous rock series.
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References
Goldschmidt, V. M., Geochemistry (Oxford University Press, 1954).
Wager, L. R., and Mitchell, R. L., Geochim. Cosmochim. Acta, 1, 129 (1951).
Turekian, K. K., and Kulp, J. L., Geochim. Cosmochim. Acta, 10, 245 (1956).
Power, G. M., thesis, Keele Univ. (1966).
Exley, C. S., and Stone, M., Present Views on Some Aspects of the Geology of Cornwall and Devon, 132 (Roy. Geol. Soc. Cornwall, Truro, 1964).
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POWER, G. Strontium : Calcium Ratio in Tourmalines from South-west England. Nature 211, 1072–1073 (1966). https://doi.org/10.1038/2111072a0
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DOI: https://doi.org/10.1038/2111072a0
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