230Th/238U and 226Ra/230Th fractionation in young basaltic glasses from the East Pacific Rise

Details 230Th/238U and 226Ra/230Th fractionation in young basaltic glasses from the East Pacific Rise 230Th/238U and 226Ra/230Th fractionation in young basaltic glasses from the East Pacific Rise

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..94..199r&link_type=abstract

Earth and Planetary Science Letters, Volume 94, Issue 3-4, p. 199-207.

Physics

8

Scientific paper

Mid-ocean ridge basalt (MORB) glasses treated to remove manganese and iron oxyhydroxide coatings containing U and Th decay chain nuclides sequestered from the ambient aqueous environment show little fractionation of (230Th) from (238U), but extensive enrichment of (226Ra) over (230Th). Chronometry based on (230Th)-(238U) disequilibrium yields a mean age of 151,000 +/- 55,000 (2σ) years ago for Th-U fractionation, from a source region with Th/U (atom ratio) = 1.58 +/- 0.43 (2σ). (226Ra) excesses over (230Th) indicate an enrichment event more recent than the fractionation of Th from U. (226Ra/230Th) correlates well with K/U, providing a rough means of estimating the age since eruption of MORB glasses.

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