Phase relations of a carbonaceous chondrite at lower mantle conditions

Details Phase relations of a carbonaceous chondrite at lower mantle conditions Phase relations of a carbonaceous chondrite at lower mantle conditions

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..143..421a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 143, p. 421-432.

Physics

10

Scientific paper

The phase relations of Allende meteorite, which belongs to the CV carbonaceous chondrites, were investigated at 22-25GPa and 1600-2300°C. With increasing pressure, the liquidus phase changes from garnet to Mg-perovskite at about 24.5GPa. Magnesiowüstite crystallizes as the second phase throughout the investigated pressure range, and the solidus curve coincides with the appearance of ringwoodite below 23GPa, Mg-perovskite at 23-24GPa and Ca-perovskite above 24GPa. Immiscible silicate and metallic liquid phases are present in the entire melting range, and a single metallic liquid persists below the solidus down to at least 1600°C. The Kd(Fe/Mg)crystal/silicate liq. is well below unity for magnesiowüstite (0.7-0.8), garnet (0.35-0.39) and Mg-perovskite (0.34). Ni and S are strongly partitioned into the metallic liquid, and the Ni and Fe partition coefficients between metallic liquid and coexisting minerals are relatively constant with variations in pressure or temperature. An important factor controlling Dmetal liq./crystal of Fe and Ni is the oxygen fugacity. Our results provide further constraints on models for early Earth differentiation and core formation.

Affiliated with

Also associated with

No associations

Rating

Phase relations of a carbonaceous chondrite at lower mantle conditions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Phase relations of a carbonaceous chondrite at lower mantle conditions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase relations of a carbonaceous chondrite at lower mantle conditions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1394045