caa a22 4500 477047289 CHVBK 20180405111333.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00874732 doi (NATIONALLICENCE)springer-10.1007/BF00874732 (ϖμ/ϖ T ) P of the lower mantle [Elektronische Daten] [Yanbin Wang, Donald Weidner] We estimate (ϖμ/ϖT) P of the lower mantle at seismic frequencies using two distinct approaches by combining ambient laboratory measurements on lower mantle minerals with seismic data. In the first approach, an upper bound is estimated for |(ϖμ/ϖT) P | by comparing the shear modulus (μ) profile of PREM with laboratory room-temperature data of μ extrapolated to high pressures. The second approach employs a seismic tomography constraint (ϖ lnV S /ϖ lnV P ) P =1.8-2, which directly relates (ϖμ/ϖT) P with (ϖK S /ϖT) P . An average (ϖK S /ϖT) P can be obtained by comparing the well-established room-temperature compression data for lower mantle minerals with theK S profile of PREM along several possible adiabats. Both (ϖK S /ϖT) and (ϖμ/ϖT) depend on silicon content [or (Mg+Fe)/Sil of the model. For various compositions, the two approaches predict rather distinct (ϖμ/ϖT) P vs. (ϖK S /ϖT) P curves, which intersect at a composition similar to pyrolite with (ϖμ/ϖT) P =−0.02 to −0.035 and (ϖK S /ϖT) P =−0.015 to −0.020 GPa/K. The pure perovskite model, on the other hand, yields grossly inconsistent results using the two approaches. We conclude that both vertical and lateral variations in seismic velocities are consistent with variation due to pressure, temperature, and phase transformations of a uniform composition. Additional physical properties of a pyrolite lower mantle are further predicted. Lateral temperature variations are predicted to be about 100-250 K, and the ratio of (ϖ lnp/ϖ lnV S ) P around 0.13 and 0.26. All of these parameters increase slightly with depth if the ratio of (ϖ lnV S /ϖ lnV P ) P remains constant throughout the lower mantle. These predicted values are in excellent agreement with geodynamic analyses, in which the ratios (ϖ ln ϱ/ϖ lnV S ) P and (ϖ ϱ/ϖ lnV S ) P are free parameters arbitrarily adjusted to fit the tomography and geoid data. Birkhäuser Verlag, 1996 Lower mantle nationallicence seismic tomography nationallicence thermoelasticiti nationallicence composition models nationallicence geodynamics nationallicence shear modulus nationallicence Wang Yanbin Center for High Pressure Research (A National Science Foundation Sciences and Technology Center) and Department of Earth and Space Sciences, University at Stony Brook, 11794-2100, Stony Brook, NY, USA aut Weidner Donald Center for High Pressure Research (A National Science Foundation Sciences and Technology Center) and Department of Earth and Space Sciences, University at Stony Brook, 11794-2100, Stony Brook, NY, USA aut pure and applied geophysics Birkhäuser-Verlag 146/3-4(1996-09-01), 533-549 0033-4553 146:3-4<533 1996 146 24 https://doi.org/10.1007/BF00874732 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00874732 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Yanbin Center for High Pressure Research (A National Science Foundation Sciences and Technology Center) and Department of Earth and Space Sciences, University at Stony Brook, 11794-2100, Stony Brook, NY, USA aut NATIONALLICENCE 700 1- Weidner Donald Center for High Pressure Research (A National Science Foundation Sciences and Technology Center) and Department of Earth and Space Sciences, University at Stony Brook, 11794-2100, Stony Brook, NY, USA aut NATIONALLICENCE 773 0- pure and applied geophysics Birkhäuser-Verlag 146/3-4(1996-09-01), 533-549 0033-4553 146:3-4<533 1996 146 24 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer