TY - JOUR
T1 - Implications for mantle dynamics from the high melting temperature of perovskite
AU - Van Keken, Peter E.
AU - Yuen, David A.
AU - Van Den Berg, Arie P.
PY - 1994
Y1 - 1994
N2 - Recent studies have implied that (Mg,Fe)SiO3-perovskite, a likely dominant mineral phase in the lower mantle, may have a high melting temperature. The implications of these findings for the dynamics of the lower mantle were investigated with the use of numerical convection models. The results showed that low homologous temperatures (0.3 to 0.5) would prevail in the modeled lower mantle, regardless of the effective Rayleigh number and internal heating rates. High-temperature ductile creep is possible under relatively cold conditions. In models with low rates of internal heating, local maxima of viscosity developed in the mid-lower mantle that were similar to those obtained from inversion of geoid, topography, and plate velocities.
AB - Recent studies have implied that (Mg,Fe)SiO3-perovskite, a likely dominant mineral phase in the lower mantle, may have a high melting temperature. The implications of these findings for the dynamics of the lower mantle were investigated with the use of numerical convection models. The results showed that low homologous temperatures (0.3 to 0.5) would prevail in the modeled lower mantle, regardless of the effective Rayleigh number and internal heating rates. High-temperature ductile creep is possible under relatively cold conditions. In models with low rates of internal heating, local maxima of viscosity developed in the mid-lower mantle that were similar to those obtained from inversion of geoid, topography, and plate velocities.
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U2 - 10.1126/science.264.5164.1437
DO - 10.1126/science.264.5164.1437
M3 - Article
C2 - 17838427
AN - SCOPUS:0028762838
SN - 0036-8075
VL - 264
SP - 1437
EP - 1439
JO - Science
JF - Science
IS - 5164
ER -