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The high‐pressure melting curve of Allende meteorite
Author(s) -
Kavner Abby,
Jeanloz Raymond
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1998gl900126
Subject(s) - allende meteorite , meteorite , mantle (geology) , silicate , peridotite , diamond anvil cell , astrobiology , geology , silicon , melting curve analysis , mineralogy , carbonaceous chondrite , chondrite , analytical chemistry (journal) , materials science , high pressure , geochemistry , chemistry , thermodynamics , metallurgy , physics , polymerase chain reaction , biochemistry , organic chemistry , chromatography , gene
Laser‐heated diamond‐cell experiments on Allende meteorite, a natural analog for undifferentiated terrestrial planetary mantles, yield a melting curve increasing from ∼2200 to 3200 K over the pressure range of 15–70 GPa, significantly below that of peridotite that is representative of the Earth's current upper mantle. Samples quenched from high temperatures and pressures reveal structures that may mimic the initial stages of differentiation between core and mantle materials. Micron‐scale chemical analyses support the idea that sulfur is enriched, and silicon, oxygen and aluminum are depleted, in the (potentially core‐forming) metal relative to the silicate phases.