Radiogenic 87 Sr, its mobility, and the interpretation of Rb---Sr fractionation trends in rare-element granitic pegmatites

Details Radiogenic 87 Sr, its mobility, and the interpretation of Rb---Sr fractionation trends in rare-element granitic pegmatites Radiogenic 87 Sr, its mobility, and the interpretation of Rb---Sr fractionation trends in rare-element granitic pegmatites

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1011c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 4, pp.1011-1018

Mathematics

Logic

2

Scientific paper

The extent of fractionation of Rb and Sr is routinely used in petrogenetic modelling of igneous processes, including internal fractionation of individual pegmatites as well as large-scale evolution of pegmatite groups and fields. However, highly evolved granitic pegmatites may contain as much as 14000 ppm Rb and less than 150 ppm Sr. The total Sr in K-feldspar and micas from geologically old and Rb-rich pegmatites may consist predominantly of radiogenic 87 Sr, which obscures the original relationship of Rb to common Sr at the time of crystallization. A subtraction of radiogenic 87 Sr calculated from the Rb content and age of emplacement is possible, but it commonly results in negative concentrations of Sr. The relative immobility of Rb, analytically determined isotopic composition of Sr, apparent ages of the Rb, Sr-bearing minerals, high concentration of 87 Sr in coexisting Rb-poor phases, and experimental evidence indicate that post-crystallization migration of radiogenic 87 Sr is significant. Where isotopic data are not available, Rb---Sr trends in geologically old and highly fractionated pegmatites are misleading and cannot be used for geochemical interpretation of pegmatite derivation or evolution.

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