凤城白云金矿早前寒武纪变质岩系应变的环境条件分析

ANALYSIS ON THE STRAIN CONDITIONS OF EARLY PRECAMBRIAN METAMORPHIC ROCKS IN BAIYUN GOLD DEPOSIT, FENGCHENG, LIAONING PROVINCE

根据辽宁凤城白云金矿地区辽河群岩石的变质相,运用金属物理学和流变学的理论,以数学方法分析了早前寒武纪角闪岩相为主条件下岩石的流变行为。有关计算结果表明,变形的比温度值(T/Tm)较高,普遍达0.7以上,差异应力值较低,为(7—20)×10~6Pa,应变率小,一般小于10^(-13)/s,这是一种稳态流变过程。数学推导表明,这种流变体服从于牛顿定律,并由此计算了本区变形岩石的等效粘滞度。

In Baiyun gold deposit, Fengcheng, Liaoning Prbvince, the metanorphic facies of Liaohe Group are high-grade amphibolite, low-grade amphibolite and high-grade greenschist facies. The paper analyses about rheologial behaviours of Early Precambrain metamorphic rocks mainly of amphibolite facies, using metal-physics and theology theory. The calculated results show that the T/Tm>0.7,σ=(7-20)×10~5Pa, strain rate is smaller than 10^(-13)/s in general, so this is a process of steady flow deformation and obeys Newton Law. The equivalent viscosity factor is positive correlation with differential stress(σ), and is negative correlation with strain rate(ε),η=7.39×10^(19.9)—1.23×10^(22.5).