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中文摘要：
以云蒙山变质核杂岩东侧的河防口低角度正断层为研究对象，通过矿物（黑云母）的变形特征和形成环境分析，获得了该断层带上的构造热演化环境：温度为780～860℃，压力约为7.3×10^8-8．6×10^8pa。提出云蒙山变质核杂岩的成因机制是，在区域伸展背景下，处于半固结状态的云蒙山花岗岩在东南侧卷入河防口-水峪伸展型韧性剪切带，使花岗岩发生中高温条件的韧性变形；之后，该韧性剪切带在隆升过程中不断向浅层次过渡，形成了一些浅层次的脆性伸展变形构造。
英文摘要：
In this paper the He（angkou low-angle detachment fault on the east side of the Yunmeng Shah metamorphic core complex is chosen as the object of research. According to the deformation features and formation environment of biotite （which is the main mineral of foliation and lineation in the Hefangkou ductile shear zone）, the temperature and pressure conditions for the tectono-thermal evolution at the fault zone were 780-860℃ and -0.73-0.86 GPa. The genetic mechanism for the metamorphic core complex is as foUows： in the setting of regional extension, the semi-solid Yunmeng Shan granite was involved in the Hefangkou-Shuiyu extensional ductile shear zone at the southeast side, thus resulting in ductile deformation of granites under intermediate- to high-temperature conditions, and afterward, this ductile shear zone passed progressively to the shallow level in the uplift process, forming some shallow-level brittle extensional structures.
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