Physics – Geophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..501s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, July 1983, p. 501-504.
Physics
Geophysics
12
Earth Mantle, Geochemistry, Geophysics, Planetary Evolution, Refractory Materials, Mineralogy, Shock Waves, Solar Corona, Thermodynamics
Scientific paper
Uncertainty regarding the timing and timescale of the earth's accretion versus the final condensation of the solar nebula admit the possibility that the earth's lower mantle (LM) may contain significantly more refractory material (e.g., Ca, Al phases) than implied by a chondrite model. In connection with the present investigation, high pressure shock-wave experiments have been conducted on diopside, CaMgSi2O6 (Di), a refractory phase in the condensation sequence, and salite, CaMg(0.82)Fe(0.18)Si2O6 (Sa), to determine the physical properties of their high pressure phases (HPP) at zero-pressure (P), room-temperature (T), and LM P, T, thereby constraining potential structure and phase assemblages for these compositions. The new HPP Sa data obtained closely parallel the lower mantle density profile from approximately 90 GPa to 136 GPa. The results of the investigation are consistent with the speculations of Jeanloz and Ahrens (1980) on the possibility of significant Ca in the lower mantle.
Ahrens Thomas J.
Svendsen Bob
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