Lebedev Sergei, Chevrot Sébastien, van der Hilst Rob D
Department of Earth, Atmospheric, and Planetary Sciences, Room 54-512, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science. 2002 May 17;296(5571):1300-2. doi: 10.1126/science.1069407.
The view that the seismic discontinuities bounding the mantle transition zone at 410- and 660-kilometer depths are caused by isochemical phase transformations of the olivine structure is debated. Combining converted-wave measurements in East Asia and Australia with seismic velocities from regional tomography studies, we observe a correlation of the thickness of, and wavespeed variations within, the transition zone that is consistent with olivine structural transformations. Moreover, the seismologically inferred Clapeyron slopes are in agreement with the mineralogical Clapeyron slopes of the (Mg,Fe)2SiO4 spinel and postspinel transformations.
关于在410公里和660公里深度界定地幔过渡带的地震间断面是由橄榄石结构的等化学相变引起的这一观点存在争议。我们将东亚和澳大利亚的转换波测量结果与区域层析成像研究的地震波速度相结合，观测到过渡带厚度及其内部波速变化之间的相关性，这与橄榄石结构转变相符。此外，地震学推断的克拉珀龙斜率与(Mg,Fe)2SiO4 尖晶石和后尖晶石转变的矿物学克拉珀龙斜率一致。
