Hydrous phase stability and partial melt chemistry in H2O-saturated KLB-1 peridotite up to the uppermost lower mantle conditions

Details Hydrous phase stability and partial melt chemistry in H2O-saturated KLB-1 peridotite up to the uppermost lower mantle conditions Hydrous phase stability and partial melt chemistry in H2O-saturated KLB-1 peridotite up to the uppermost lower mantle conditions

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..143..387k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 143, p. 387-395.

Physics

17

Scientific paper

Stability of hydrous phases and partial melt chemistry in 13.6wt.% H2O bearing mantle peridotite are reported in a pressure range up to 24GPa and a temperature range from 900 to 1400°C. Various hydrous phases like phase E, phase D, superhydrous B, hydrous β and γ phases of olivine stoichiometry are observed between 14 and 24GPa. The phase boundary between the β phase and γ phase of olivine under hydrous conditions is found to be at higher pressure than under the dry conditions. The H2O-undersaturated solidus temperature of a model mantle is estimated up to 11GPa based on (1) the reported solubility of H in nominally anhydrous minerals and (2) linearity of H2O-undersaturated solidus between the dry and wet solidus [Science 276 (1997) 240] with respect to H2O abundance at a constant pressure.
Under H2O-saturated conditions at pressures greater than 10GPa, the (Mg+Fe)/Si atomic ratios of partial melts decrease with increasing temperature: from 2.5 at 1100°C to 1.6 at 1300°C at 14GPa, from 3.3 at 1100°C to 1.8 at 1300°C at 17GPa, and from 2.8 at 1200°C to 1.7 at 1400°C at 20GPa. This is in contrast to the reported constant value of dry partial melts (1.1 between 10 and 18GPa [J. Geophys. Res. 99 (1994) 17729]). A partial melt coexisting with Mg-perovskite at 24GPa and 1400°C has (Mg+Fe)/Si and Ca/Al atomic ratios of 2.2 and 11, respectively. Ultramafic hydrous melts similar to those observed experimentally under uppermost lower mantle conditions may have contributed to chemical differentiation between the upper and lower mantle.

Affiliated with

Also associated with

No associations

Rating

Hydrous phase stability and partial melt chemistry in H2O-saturated KLB-1 peridotite up to the uppermost 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 Hydrous phase stability and partial melt chemistry in H2O-saturated KLB-1 peridotite up to the uppermost lower mantle conditions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrous phase stability and partial melt chemistry in H2O-saturated KLB-1 peridotite up to the uppermost lower mantle conditions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1394042