A perovskitic lower mantle inferred from high-pressure, high-temperature sound velocity data

  title={A perovskitic lower mantle inferred from high-pressure, high-temperature sound velocity data},
  author={Motohiko Murakami and Yasuo Ohishi and Naohisa Hirao and Kei Hirose},
The determination of the chemical composition of Earth’s lower mantle is a long-standing challenge in earth science. Accurate knowledge of sound velocities in the lower-mantle minerals under relevant high-pressure, high-temperature conditions is essential in constraining the mineralogy and chemical composition using seismological observations, but previous acoustic measurements were limited to a range of low pressures and temperatures. Here we determine the shear-wave velocities for silicate… 
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The varied nature of geophysical signatures encountered in the identification of blocks with favorable setting for emplacement of kimberlites, the major geological hosts of diamonds, has resulted in
Chemical composition and origin of the earth's primitive mantle