基于单矿物流变方程的下地壳多矿物岩石流变性质的数值模拟

项目名称： 基于单矿物流变方程的下地壳多矿物岩石流变性质的数值模拟

项目编号： No.41304062

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 许俊闪

作者单位： 中国地震局地壳应力研究所

项目金额： 25万元

中文摘要： 下地壳流变是地壳构造活动的重要力学机制,因此对研究地壳力学行为、地震孕育环境、壳幔过渡带性质、板块运动等一系列科学问题都有着非常重要的意义。下地壳流变的实质是其组成岩石的流变。虽然理论和实验上对单矿物岩石的流变性质研究较多，但对多矿物岩石的流变性质研究还存在很多不足，争议较大。现有计算研究表明,有限元方法有助于理解多矿物岩石的流变性质。因此，为了更好的理解下地壳流变，我们选取下地壳主要矿物（辉石、长石）建立多矿物岩石模型，基于单矿物流变实验方程和单矿物位错蠕变方程，利用有限元方法研究多矿物岩石在下地壳温度和偏应力条件下的流变性质。探讨不同组成、不同强度的矿物对岩石流变性质的影响，为研究下地壳的流变性质提供参考。

中文关键词： 两相矿物岩石；应力不均匀性；有限元方法；蠕变；

英文摘要： Studying the rheological properties of the lower crust is extremely important to understand the mechanical behavior of crust, earthquake generating, the properties of crust-mantle transition, the tectonic motion and etc. The substance of the lower crust rheological properties is the rheological behavior of its composed multi-mineral rocks. Previous studies about rheological properties mainly focused on the mono-mineral rock. Until now, studies on multi-mineral rocks from experiments are still not enough and controversial views goes on because of the complex composition and uncontrollable experimental conditions. Previous simulating studies indicated that simulation by the finite elemen method is an useful way to understand the rheologyical properties of the multi-mineral rocks. In this study, the typical minerals (pyroxene, feldspar) of the lower crust will be selected to establish multi-mineral rock models. The rheological properties of the multi-mineral rock models will be studied by the finite element method. The rheological equations of mono-minerals from experiments and dislocation creep theory will be considered. The effects of composition, strength, temperate and stress on the rheological properties of multi-mineral rock will be focused. This study may supply important constraints on the rheological prop

英文关键词： Two-phase rock；Stress heterogeniety；Finite element method；Creep；