大陆岩石圈流变研究进展与高温高压流变实验现状

The status of continental lithosphere rheology and experiments on creep of rocks at high temperature and high pressure

大陆岩石圈类似于"三明治"的多层流变结构已经被广泛接受,并用于大陆动力学研究的各方面.然而近年来地震资料和高温高压流变实验结果表明,大陆岩石圈流变可能不是单一模式,流变结构具有多样性,而下地壳流变特性是其中最复杂的层次,这不仅受下地壳成分和结构本身的非均匀控制,而且与其含水程度相关.高温高压流变实验已经积累了大量的数据,但基性岩流变实验目前仍然处于数据积累阶段,缺乏系统性,特别是缺少含水基性岩的流变实验结果,因此,加强干的和含水的基性岩流变实验研究是深入认识下地壳岩石流变必不可少的手段和方法之一.

The multi\|layer rheology of continental lithosphere which is like a jelly sandwich has been widely accepted, and the rheological model has been used to discuss many science topic of continental geodynamics. However, a recent reassessment of the earthquake focal depth distribution of on continents and the experimental data of rock rheology make it is difficult to maintain the single pattern, but it exists variety rheological structure in different continents, especially rheology of lower crust where is the most complex layer, which is not only controlled by non\|uniformity of component and structure, but also effect by water in lower crust. Although a large number of experimental data about rock rheology at high temperature and high pressure have been obtained, rheological experiments of lower crustal rocks are still lack systematic, especially the rheological data of wet rocks are sparse. So it is most important to deep understand the rheology of lower crust for performing the rheological experiments of lower crustal rocks, including both dry and wet samples. 