Nd and Sr isotopes from diamondiferous eclogites, Udachnaya Kimberlite Pipe, Yakutia, Siberia - Evidence of differentiation in the early Earth?

Details Nd and Sr isotopes from diamondiferous eclogites, Udachnaya Kimberlite Pipe, Yakutia, Siberia - Evidence of differentiation in the early Earth? Nd and Sr isotopes from diamondiferous eclogites, Udachnaya Kimberlite Pipe, Yakutia, Siberia - Evidence of differentiation in the early Earth?

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.118...91s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 118, no. 1-4, p. 91-100.

Computer Science

9

Biotite, Diamonds, Eclogite, Neodymium, Peridotite, Strontium, Garnets, Isotopes, Planetary Evolution, Rocks, Siberia

Scientific paper

Nd and Sr isotopic data from diamond-bearing eclogites found in the Udachnaya kimberlite (Yakutia) are interpreted as indicating an early (4 Ga or later) differentiation event, whereby the mantle split into complementary depleted and enriched reservoirs. Reconstructed whole-rock Sr-87/Sr-86 ratios (present-day) range from 0.70151 to 0.70315 and are consistent with a mantle origin for these rocks. The Nd isotopic evolution lines of four samples (U5, U37, U41 and U79) converge at 2.2-2.7 Ga. Sample U5 is unique in exhibiting the most enriched signature of any of the samples yet analyzed (present-day epsilon(Nd) of -20), and this sample points unequivocally to an old, enriched component. A complementary depleted mantle component is suggested by two of the eclogite samples, U86 and U25, which yield epsilon(Nd) values (at 2.2 Ga) of + 13 and + 7, respectively. The two mantle reservoirs possibly formed prior to 4 Ga and evolved separately until 2.2-2.7 Ga. At that time, the reservoirs were melted forming eclogites both as residues (from the enriched reservoir) and as partial melts of peridotite (from the depleted reservoir), resulting in demonstrably different histories for eclogites from the same locality.

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