差应力对辉长岩熔融程度影响的实验研究  

EQUIVALENT RELATION BETWEEN TEMPERATURE AND DIFFERENTIAL STRESS TO DEGREE OF ROCKS MELTING:A CASE STUDY OF GABBRO

作　　者：沙茜[1] 马瑞[1] 刘正宏[1] 董晓杰[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061

出　　处：《矿物岩石》2010年第4期43-47,共5页Mineralogy and Petrology

基　　金：国家自然科学基金(40972135);博士点基金(20090061110050)

摘　　要：利用高温高压的实验分别对辉长岩进行差应力和温度与岩石熔融程度测试,并进一步分析讨论差应力和温度等岩石熔融程度的关系。动、静态的实验结论表明:(1)静态熔融条件下,岩石的熔融程度主要受温度的影响并且岩石熔融程度与温度呈正相关关系;(2)在保持一定温度不变的动态熔融条件下,岩石的熔融程度还与差应力呈正相关的关系;(3)差应力可以降低熔点,促使熔融提前发生并且使熔融强度增大;(4)差应力对岩石的熔融具有明显的控制作用;(5)以700℃为基准,差应力每增加5MPa其带来的影响与温度升高50℃的效果相当;(6)基性岩石的熔融对差应力的敏感程度最高。该实验结果还表明在研究岩石深熔作用时尤其是在构造作用较强烈地区要考虑差应力的影响因素。The effect of differential stresses on the degree of rock melting by mean of HTHP experiment was analyzed.The experimental equipment is three-axis device produced by Instron Company of Britain,which uses stopcock and columnar solid medium.Static and dynamic experiments were designed and gabbro was selected as testing samples.The experiments showed that under static melting conditions the melting degree of the rocks mainly lies on the temperatures,and the higher the temperature is the more the melting degree is.If the temperature remains unchanged,the melting degree has a direct correlation to different stresses.It was also indicated that different stresses can decrease the melting points and make the melting advance and enhance the melting degree of the rocks.Under the condition of 700 ℃,raising differential stress of 5 MPa has an equal effect of increasing temperature of 50 ℃.Of all the rock types,the melting of basic igneous rocks is more sensitive to the differential stress.The experiments revealed that the effect of different stresses during the deep melting should be considered.

关 键 词：差应力 熔融程度 温度 

分 类 号：P589.1[天文地球—岩石学]