Majorite

Dans la tres grande majorite des tests in vivo, les derives mono- et dialkylstanniques se revelent depourvus de genotoxicite. Les tests in vitro donnent des resultats variables, avec peu d indices d une reactivite vis-a-vis de T ADN. En revanche, on a observe, dans les tests in vitro, les indices d une activite clastogene et des effets sur la formation du fuseau pendant la mitose. 

This plot is also used to look for unu.sual samples. This is indicated if a small number of samples are significantly off of the ideal line. It is not possible to irientiih outliers because the majorit) of the samples do n[Pg.150]

II resulte de cette discussion que la grande majorite des resultats concemant la mesure des viscosites des systemes vitreux par traction doit etre consideree avec reserve. II convient done de mesurer ces viscosites en faisant appel k des contraintes de cisaillement, tout en controlant les variations eventuelles du volume de l echantillon, et son histoire thermique. 

S6 Very strongly shocked Solid-state recrystallization and staining, ringwoodite, melting Shock melted (normal glass) Majorite, melting 75-90... 

Drake M. J. and McFarlane E. A. (1993) Mg-perovskite/siUcate melt and majorite garnet/silicate melt partition coefficients in the system CaO-MgO-Si02 at high temperatures and pressures. J. Geophys. Res. 98, 5427-5431. 

Herzberg C., Jeigenson M., Skuba C., and Ohtani E. (1988) Majorite fractionation recorded in the geochemistry of peridotites from South Africa. Nature 332, 823-826. 

Figure 1 Depth-varying phase proportions in a pyrolite model mantle after the manner of Ringwood (1989), Ita and Stixmde (1992), and Bina (1998h). Phases are (a) ohvine, (fi) wadsleyite, (y) ringwoodite, (opx) orthopyroxene, (cpx) clinopyroxene, (gt-mj) garnet-majorite, (mw) magnesiowiistite, ((Mg,Fe)-pv) ferromagnesian sihcate perovskite, and (Ca-pv) calcium silicate perovskite. Patterned region at base denotes likely heterogeneity near core-mantle boundary.

Phase X has been observed in a number of studies on hydrous potassium-bearing systems (Trpnnes, 1990, 2002 Inoue et al., 1998a Luth, 1997). Its stability relations have been studied by Konzett and Fei (2000), who found that it breaks down between 20 GPa and 23 GPa at 1,500-1,700 °C. Its breakdown products were reported by Konzett and Fei (2000) to be K-hollandite, y-Mg2Si04, majorite, Ca-perovskite, and fluid. Hence, phase X is not succeeded by another hydrous potassic solid phase, and is therefore the hydrous potassic (solid) phase with the highest-pressure stability. The crystal structures of phase X and some related phases were determined by Yang et al. (2001). 

Draper D. S., Xirouchakis D., and Agee C. B. (2002a) Effect of majorite transformation on garnet-melt trace element partitioning. Lunar Planet. Sci. XXXIII, abstract 1306. 

Ohtani E., Kawabe I., Moriyama J., and Nagata Y. (1989) Partitioning of elements between majorite garnet and melt... 

Yurimoto H. and Ohtani E. (1992) Element partitioning between majorite and liquid a SIMS smdy. Geophys. Res. Lett. 19, 17-20. 

Rhodope, Greece Diamond, majorite, quartz pseudomorph after coesite T 600-900 °C P 31-39 kb 75 Ma Mposkos and Kostopoulos (2001)... 

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