Abstract
FROM the study of rare earth elements (REE) in basalts, spilites and hydrothermally altered basalts in the ocean floor1–5, ophiolites6,7, geosynclines3,8 and low-grade to greenschist facies regions9 it has come to be accepted that the REE are immobile during rock alteration. This conclusion has led to the use of certain abundance ratios, particularly La/Sm and La/Yb, as indicators of parent magma type and genesis. Despite some suggestions2,10 that REE, such as La and Ce, may be mobile during sea-water/rock interaction, hydrothermal alteration or spilitisation of igneous rocks, the REE continue to be treated (e.g. refs 6 and 7) in an analgous fashion to Ti, Y and Zr (ref. 11). Here we show from analyses of a variably altered tholeiite flow that spilitisation may, in some circumstances, affect the REE abundances and their chondrite normalised pattern.
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HELLMAN, P., HENDERSON, P. Are rare earth elements mobile during spilitisation?. Nature 267, 38–40 (1977). https://doi.org/10.1038/267038a0
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DOI: https://doi.org/10.1038/267038a0
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