岩石软化温度及其在地球深部岩石力学性质研究中的意义

THE SOFTENING TEMPERATURE OF ROCKS AND ITS IMPLICATION IN ROCK MECHANICS OF EARTH'S DEEP INTERIOR

从高温高压岩石力学实验的角度阐述了岩石软化的现象,提出岩石软化温度的概念和定义以及测量方法.根据对大量经过高温变形试件的显微结构观察,从岩石中各矿物组分对不同温度下的变形反应和机制出发,认为岩石软化现象的本质是岩石中的各矿物组分在高温下逐步由脆性变形向韧性变形和塑性变形转化过程中在岩石力学性质上的综合反映.提出岩石中矿物变形序次及不同组分矿物在岩石中的结构位置和含量是决定岩石软化温度的主要因素.由此进一步讨论了岩石中矿物的变形序次对地壳内岩石脆-韧性变形转化条件的影响及其在地球深部岩石力学性质和地震孕育理论研究中的重要意义.

Based on the experimental results of rock mechanical behavior at hightemperature,the softeningphenominon of rocks has been described.The concept,definition and method for measuring rock soft-ening temperature have been set up.Based on micro structure examining results of the deformed rock spec-imen,various mines deformation response and mechanism at different temperatures,the author believedthat the naute of the phenominon of the rock softening temperature are the synthetic effect of rock me-chanical behavior in the transformation of mines deformation from brittle to durctile and to plastic whileincreasing of termperature.So that the deformation,the location on texture and the content of mines inrock would be the essential factors for deciding rock softening temperature.Finally,furtur disscussion isput on importance of mineral deformation order to transformation condition of crustal rock from brittleto ductile,rock mechanical property in earth's deep part,and theories for earthquake pregnancy.