地球深部物质的密度差异影响着地球结构的分层特征以及物质的迁移方式,是理解深部地球动力学行为的关键因素。对于地幔来说,硅酸盐熔体和矿物之间的密度差异决定了熔体的居留位置。但是下地幔压力条件下熔体密度的测定一直是个技术难题。德国Bayreuth大学的Sylvain Petitgirard与合作者发展了一个新技术,将X射线吸收方法成功用于金刚石压腔,在高至核幔边界压力的条件下原位测 The density difference of the Earth’s deep matter affects the stratigraphic features of the Earth’s structure and the mode of material migration, which are the key factors for understanding the geodynamics of the deep earth. For the mantle, the difference in density between the silicate melt and the mineral determines where the melt will reside. However, the determination of melt density under the lower mantle pressure has been a technical challenge. Sylvain Petitgirard and his collaborators at Bayreuth University in Germany have developed a new technology that successfully applies the X-ray absorption method to a diamond press chamber that is situ-measured at pressures up to the boundary of the mantle