A METHOD FOR ESTIMATING THE DEPTH OF PETROGENESIS AND METALLOGENESIS
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摘要: 成岩成矿深度的构造校正测算方法,是从测算压力中先消除构造附加静水压力之后再计算上覆岩石厚度,即成岩成矿深度的方法。该方法建筑在对地壳岩石处于固体应力状态的认识之上,采用弹性固体模型代替静止流体模型,比沿袭至今单纯用压力/密度方法得出的深度更符合于实际情况。该文以胶东玲珑-焦家式金矿床为例,介绍了该方法的理论基础和野外地质研究方法——开展变形岩相形迹填图,在室内利用三维变形和古差应力测量,计算差应力时根据样品所处构造部位和性质,选择不同的参数换算成矿时的差应力值。观测统计位错密度时采用"最大位错密度"观测方法,给出恢复三维主应力的应力应变方程组,利用测算总压力P和构造附加静水压力PS的关系,P=PS+PG,取得重力产生的附加静水压力值PG,根据Terzaghi假设求得成矿深度。Abstract: The method proposes to calculate the hydrostatic pressure by subtracting the tectonic component from the total pressure at a point in the crust. such a pressure is referred to as a tectonic-stress free pressure or a teetonic-stress corrected prossure. In this paper,the depth of the sold mineralization is calculated as 3.5km~2.5km,and the depth of the formation of the coesite-bearing eclogite,Dabie UHPM zone,China as 32km. Details of the calcuation are given in te text.
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