Secular boron isotope variations in the continental crust - An ion microprobe study

Details Secular boron isotope variations in the continental crust - An ion microprobe study Secular boron isotope variations in the continental crust - An ion microprobe study

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.108..229c&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 108, no. 4, Feb. 1992, p. 229-241. Research supported by CNRS and INS

Computer Science

14

Boron Isotopes, Earth Crust, Geochemistry, Ion Probes, Secular Variations, Geochronology, Igneous Rocks, Lithium, Tourmaline

Scientific paper

The paper analyzes tourmalines of various chemical compositions, hosted in magmatic rocks with ages ranging from 3.8 Ga to the present, for delta(B-11) by ion microprobe. No relationship between the age and the delta(B-11) values is observed for Fe- or for Mg-rich tourmalines. The delta(B-11) values of 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 progression extraction of the continents.

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