高温高压下岩石弹性波速特征及其在深部地质研究中的意义

THE CHARACTERISTICS OF ELASTIC WAVE VELOCTTY OF ROCKS AT HIGH T AND P: IMPLICATIONS FOR THE STUDY OF DEEPSEATED GEOLOGY

本文收集、整理、研究了７０年代以来的高温高压下岩石的Ｖｐ，Ｖｓ，Ｖｐ／Ｖｓ，Ｖｐ各向异性等实验资料后得出：（１）低压下岩石Ｖｐ的急剧变化是由岩石中裂纹与孔隙等引起的；（２）温度升高可增大由岩石组构引起的Ｖｐ各向异性的变化率；（３）同种岩石在不同的大地构造环境中具有不同的波速值与变化规律；（４）Ｖｐ在高地温区随温度先降低而后升高，其原因是由矿物相变造成的，与地壳中低速带的性质相当。文章最后讨论了实测波速转换为岩石类型时实验研究岩石波速的意义。

We collected. collated and studied experiment data of Vp. Ws. Vp/ Vs and Wp andisotropy of rocks at high T and P since the 1970s. and reached that (1) the rapid change of Vp of rocks at the low pressure results from the crackd and the pores etc. in rocks. (2) the increasing temperature may lead to increase the change of rate of Vp anisotropy that is produced by the rock fabrics; (3) the same type of rocks displays different wave velocity and its regularity of change in the different tectonic setting; and (4) Vp decreases first and increases then in high geotherm area along with the increasing depth and this results from the mineral phase transformation. this corresponds to the feature of the rock wave velocity through the eaperiment study when the wave velocity of the praitical determine is transformed into the rock type.