温度与差应力对岩石熔融程度的等效关系——以角闪变粒岩为例  

Equivalent Relationship Between Temperature and Differential Stress to the Melting Degree of Rocks:A Case Study of Hornblende Granulite

作　　者：沙茜[1] 马瑞[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《吉林大学学报（地球科学版）》2011年第1期106-110,共5页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40972135);高等学校博士学科点专项科研基金项目(20090061110050)

摘　　要：为了探讨差应力和温度与岩石熔融程度的关系,利用角闪变粒岩进行高温高压条件下的岩石变形实验。包括差应力条件下的动态实验,围压100MPa,温度700℃,施加相当于差应力为0～25MPa,且以每5MPa为间隔进行天然块状岩石样品的动态熔融;在相同的围压条件下,温度由700℃到900℃每50℃为间隔,进行无差应力条件下天然块状岩石的静态熔融实验,并进行对比研究。结果表明,在相同温度条件下,岩石的熔融程度随着差应力的增加明显增高。通过对斜率的对比分析表明:以700℃为基准,差应力每增加5MPa,其带来的影响与温度升高40℃的效果相当,也说明中性岩石的熔融对差应力的敏感程度比酸性岩要高。To study the relationships of differential stresses and temperature to the melting degree of rocks,we use hornblende granulite to do some high-T and high-p experiments.Firstly,we carried out the dynamic melting experiment by imposing differential stresses from 0 to 25 MPa with step at 5 MPa on natural bulk rock samples under confining p and T at 100 MPa and 700 ℃,respectively.Then,we did the static experiment under the same confining pressure but without differential stresses by increasing the T from 700 to 900 ℃ with the step at 50 ℃.Our experimental results indicate that the melting degree of rocks increases with the increase of differential stresses.Through comparing the slopes of the experiments,we found that if taking 700 ℃ as the starting point,the increase of 5 MPa differential stress is equal to the effect of increasing 40 ℃,suggesting that the intermediate rocks are more sensitive to differential stress then felsic rocks

关 键 词：差应力 熔融程度 温度 变质岩 

分 类 号：P588.3[天文地球—岩石学] P589[天文地球—地质学]