1. 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

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

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

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

5. Reconstructed P-T trends