Other
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..65..311a&link_type=abstract
Earth and Planetary Science Letters, Volume 65, Issue 2, p. 311-321.
Other
3
Scientific paper
On the basis of a dynamic model of a continuous Pb isotope evolution, the variations in the isotopic ratios of uranogenic and thorogenic Pb in a number of young ore deposits, ocean sediments and volcanic rocks from mid-ocean ridges, oceanic islands, island arcs and continents are evaluated. The deviations in the Th/U ratio from its model values are calculated. A model parameter T which indicates a more ancient enrichment in U/Pb (crustal-type Pb sources) or younger enrichment in U/Pb (mantle-type Pb sources) is also calculated. The relative change in the Th/U ratio is close to 1 for mantle-type Pb sources (lower T values) and decreases for crustal-type Pb sources (higher T values). An interpretation of these changes could be connected with the differences in the U and Th geochemical behaviours in metamorphic processes under the conditions of a deeper (mantle) or crustal source owing to the differences in their valence states. In some cases they have similar (U4+ and Th4+) migration abilities; in others (U6+ and Th4+), considerably different.
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