SUBISOBARIC COOLING OF MAFIC XENOLITHS

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Presentation transcript:

SUBISOBARIC COOLING OF MAFIC XENOLITHS FROM THE UDACHNAYA KIMBERLITE PIPE, SIBERIA SAPEGINA A.V.1,2, PERCHUK A.L. 2,1, SAFONOV O.G.1,2, YAPASKURT V.O.2, SHATSKY V.S.3, MALKOVETS V.G.3 1 Korzhinskii Institute of Experimental Mineralogy RAS, Chernogolovka, Russia; 2 Geological Faculty, Moscow State University, Russia; 3 Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia. Grt Pl Cpx

Mineral composition Cpx-zonning Grt-zonning Orthopyroxenes rim core Plagioclase

Phase equilibria modeling Conventional thermobarometry T, °C P, kbar Stage I Stage II Ai, 1994 671 582 8 Ravna, 2000 723 619

Phase equilibria modeling Conventional thermobarometry T, °C P, kbar Stage I Stage II Ai, 1994 693 593 6.7 Ravna, 2000 713 627

Reconstructed P-T trends