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地质学报  2005 

差应力状态对岩石熔融程度的影响--以黑云母片麻岩的动、静态熔融对比实验为例

, PP. 338-341

Keywords: 块状岩石,差应力,构造附加力,熔融程度

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Abstract:

以河北省平山县阜平群的黑云片麻岩为实验样品,有差应力条件下的动态实验,围压10MPa,温度800℃条件下,施加相当于差应力为0~25MPa,且以每5MPa为间隔进行了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800~900℃每20℃为间隔,进行了无差应力条件下天然块状岩石的静态熔融实验,并进行了对比研究。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,当差应力达到25MPa时,800℃条件下岩石的熔融程度与900℃静态熔融条件下岩石的熔融程度相当。实验力学分析计算表明,动态实验中构造附加压力增加了围压,差应力每增加5MPa相当于1.67MPa的增压,其与静态实验中温度升高20℃的效果一样。该实验结果对研究岩石深熔作用的深度问题有一定的参考意义。

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