The theoretical effect of metasomatism on Sm-Nd isotopic systems

Details The theoretical effect of metasomatism on Sm-Nd isotopic systems The theoretical effect of metasomatism on Sm-Nd isotopic systems

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1337r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 5, pp.1337-1341

Mathematics

Logic

5

Scientific paper

If Sm and Nd are mobilized during fluid-rock interaction, fractionation of the ratio between Sm and Nd in geological units may take place. The fractionation can be characterized by a fractionation factor F , which can attain any value between D Sm /D Nd and 1 /( D Sm / D Nd ) depending on the fluid/rock ratio during REE transfer. If such fractionations are not recognized this will induce errors in Sm-Nd isotopic interpretations of age and provenance of the affected geological units. The apparent ages and Nd values are functions of the true values, F , and the time lapse between petrogenesis and secondary disturbance. The functional relationships can be closely approximated by direct proportionalities.

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