Computer Science
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..77..245i&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 77, no. 2, March 1986, p. 245-256.
Computer Science
55
Eclogite, Garnets, Mineralogy, Phase Transformations, Solid Phases, Basalt, Earth Mantle, High Pressure, Lattice Parameters, Pressure Distribution
Scientific paper
Mineral assemblages displayed by MORB and alkali-poor olivine tholeiites have been investigated over the pressure interval 4.6-18 GPa at 1200 C. Both compositions crystalize to form normal eclogites between 4.6 and 10 GPa, and there is little change in the relative proportions of garnet and pyroxene over this range. However, the proportion of garnet increases rapidly above 10 GPa as pyroxene dissolves in the garnet structure and pyroxene-free garnetites (+ or - stishovite) are produced by 14-15 GPa, dependent upon composition. The garnetite facies for both compositions possess zero-pressure densities of 3.75 g/cu cm, implying that subducted oceanic crust remains appreciably denser than surrounding mantle to depths exceeding 600 km. It is demonstrated that the seismic velocity distributions in the mantle between 400 and 650 km are inconsistent with Anderson's (1979) hypothesis that this region is of eclogitic composition.
Hibberson W. O.
Irifune Tetsuo
Ringwood A. E.
Sekine Tomoyuki
No associations
LandOfFree
The eclogite-garnetite transformation at high pressure and some geophysical implications 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 The eclogite-garnetite transformation at high pressure and some geophysical implications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The eclogite-garnetite transformation at high pressure and some geophysical implications will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1281708