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Russian Geology and Geophysics

2004 year, number 8

SPECIFIC STRUCTURE OF THE LOWERMOST EARTH'S CRUST AT THE ZAGADOCHNAYA KIMBERLITE PIPE, YAKUTIA

L.V. Buzlukova, V.S. Shatsky, and N.V. Sobolev
Institute of Mineralogy and Petrography, Siberian Branch of RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Lower crustal xenoliths, garnet granulites, compressional wave velocities
Pages: 942-959

Abstract

Study has addressed xenoliths of the crustal rocks from the Zagadochnaya kimberlite pipe, in the Daldyn-Alakit diamondiferous district of the Yakutian kimberlite province. Most xenoliths are represented by garnet granulites (60% of the bulk of xenoliths, of which paraganeses with amphibole amount to 20%), by plagiogneisses (30%) and garnet-biotite schists (10%).
P-T conditions of metamorphism for garnet granulites are 700-780