Diamondiferous eclogites from Siberia: Remnants of Archean oceanic crust

Details Diamondiferous eclogites from Siberia: Remnants of Archean oceanic crust Diamondiferous eclogites from Siberia: Remnants of Archean oceanic crust

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.5191j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 23, pp.5191-5207

Computer Science

22

Scientific paper

We have investigated eight diamond-bearing bimineralic eclogite xenoliths from the Udachnaya Mine, Yakutia, Siberia, in terms of major elements, 87 Sr / 86 Sr -, 143 Nd / 144 Nd and oxygen isotopic ratios. The 18 O -values, measured with the new laser-fluorination technique, are different from mantle values and range between 5.19 and 7.38%. with an average error of 0.08%.. Strontium and neodymium initial isotopic ratios for cpx are between 0.70226 and 0.70699 and 0.51170 and 0.51257, respectively. Chemically and petrographically, the Siberian eclogites are very similar to the South African eclogite suite from Roberts Victor or Bellsbank, the most important similarities being the late Archean age (2.76 Ga) and the 18 O values that deviate from mantle values. However, differences exist in detail, as no samples with 18 O values lower than mantle values have yet been reported from Siberia and the cesium concentrations of the Siberian eclogites are generally lower than those of the Roberts Victor eclogite suite. The data obtained from the studied sample suite are best explained by a model proposing an origin from Archean oceanic crust that was intensely altered prior to subduction to mantle depths. Using oxygen isotopic values, the effects of seawater alteration can be shown and the composition of the unaltered protolith qualitatively estimated. We propose that mantle eclogites from kimberlites were generated by a globally operating subduction process during the late Archean and that differences between samples from different cratons are small compared to their similarities.

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