Article

Geochemistry International

, Volume 45, Issue 6, pp 538-545

Mantle(?) xenoliths in the carbonatites of northern Transbaikalia

  • G. S. RippAffiliated withGeological Institute, Siberian Division, Russian Academy of Sciences
  • , A. G. DoroshkevichAffiliated withGeological Institute, Siberian Division, Russian Academy of Sciences
  • , M. V. BadmatsyrenovAffiliated withGeological Institute, Siberian Division, Russian Academy of Sciences
  • , N. S. KarmanovAffiliated withGeological Institute, Siberian Division, Russian Academy of Sciences

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Abstract

The composition and nature of high-Cr minerals in lithic clasts from the carbonatites of the Veseloe occurrence, northern Transbaikalia, were considered. In order to determine their source, the Cr-bearing phases were compared with chromite, magnetite, and rutile from ultrabasic rocks, mantle xenoliths, and eclogites. It was suggested that the xenoclasts studied were formed at great depths, whereas the carbonatites were directly derived from the mantle rather than formed by the crustal differentiation of a silicate-carbonate melt.