第139回ジオダイナミクスセミナー
　　　Geodynamics　Seminar

　「放射光X線その場観察実験によるパイロライトとMORB
　　の660 km地震波不連続面付近における密度変化
　"Density changes of pyrolite and MORB around 660 km seismic
　 discontinuity by in-situ X-ray diffraction measurement"
　　　　　　　　　
　　　　　講師：実平　武（愛媛大学博士５年）

　　　　　　　　　　　　 　　　　　 　　　　　
　　　　　主催　：　愛媛大学地球深部ダイナミクス研究センター
　　　　　日時　：　２００５年１１月１８日（金）17：00〜
　　　　　場所　：　愛媛大学理学部講義棟　３０１教室

要　旨
　Density changes of pyrolite and MORB as a function of depth were determined by in-situ X-ray diffraction measurements around 660 km seismic discontinuity, with a combination of multi-anvil apparatus and synchrotron radiation at SPring-8. We were successful to constrain the density changes of pyrolite and MORB as a function of depth. The absolute density changes of pyrolite were agreed well with those of PREM, especially under lower mantle conditions. However, some results on the basis of high P-T experiments, combined with density calculation using representative equations of state for constituent minerals of these rocks, yielded significantly large uncertainty (~1-4%). This is due to the uncertainties of thermoelastic parameters, such as chemical composition dependences, of individual minerals, especially Mg-perovskite and majorite garnet.




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