Short-lived radioactivity and magma genesis

Details Short-lived radioactivity and magma genesis Short-lived radioactivity and magma genesis

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...257.1368g&link_type=abstract

Science (ISSN 0036-8075), vol. 257, no. 5075, Sept. 4, 1992, p. 1368-1376. Research supported by NATO.

Computer Science

27

Chemical Equilibrium, Earth Mantle, Magma, Radioactivity, Thorium Isotopes, Melting, Volcanology

Scientific paper

Short-lived decay products of uranium and thorium have half-lives and chemistries sensitive to the processes and time scales of magma genesis, including partial melting in the mantle and magmatic differentiation in the crust. Radioactive disequilibrium between U-238, Th-230, and Ra-226 is widespread in volcanic rocks. These disequilibria and the isotopic composition of thorium depend especially on the extent and rate of melting as well as the presence and composition of vapor during melting. The duration of mantle melting may be several hundred millennia, whereas ascent times are a few decades to thousands of years. Differentiation of most magmas commonly occurs within a few millennia, but felsic ones can be tens of millennia old upon eruption.

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