Computer Science
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..92..323h&link_type=abstract
Earth and Planetary Science Letters, Volume 92, Issue 3-4, p. 323-334.
Computer Science
18
Scientific paper
Perovskite is a common matrix mineral and a major carrier of U, Th, Sr and Nd in kimberlite/lamproite magmas. A combined U-Pb age and Sr, Nd and Pb isotopic study of terrestrial perovskite demonstrates that Cretaceous-Jurassic kimberlites in eastern North America are isotopically similar to ocean island basalts. The initial Sr and Nd isotopic compositions for two perovskite populations from the Elliott County kimberlite, Kentucky (0.70403, 0.51266 and 0.70485, 0.51248, respectively) provide evidence that some kimberlite magmas experience substantial isotopic modification in the subcontinental mantle during their evolution. The approximately colinear Sr and Nd isotopic results for perovskite can be explained by the existence of at least three isotopically distinct mantle reservoirs beneath eastern North America. The kimberlitic perovskite data alone extend from PREMA-like compositions to values estimated for primitive upper mantle while the perovskite data from the Prairie Creek lamproite provide evidence for the existence of a third mantle component that experienced an ancient (Late Proterozoic?), LREE and Rb enrichment event.
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