230Th-238U disequilibria in historical lavas from Iceland

Details 230Th-238U disequilibria in historical lavas from Iceland 230Th-238U disequilibria in historical lavas from Iceland

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..55..393c&link_type=abstract

Earth and Planetary Science Letters, Volume 55, Issue 3, p. 393-406.

Physics

35

Scientific paper

The 230Th-238U disequilibrium studies on historical lavas from Iceland show a relative homogeneity for Th/U ratios and also a variation for (230Th/232Th) activity ratios at the scale of the island. The (230Th/238U) disequilibrium ratio is always greater than 1 which indicates that partial melting produces magmas with Th/U ratios greater than those of the mantle source. Furthermore, there seems to be a correlation between the variations of (230Th/232Th) (and δ18O) ratios and the geographical location of the samples along the active zones of Iceland. We develop and discuss several models in order to explain these variations.

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