断层面上迹线产状及总断距确定

THE DETERMINATION OF TRACE OCCURRENCE AND TOTAL FAULT DISPLACEMENT ON THE FAULT PLANE

除了深、大断裂等复杂断层以外,研究一般断层都需利用岩层、岩脉等各自的迹线。迹线的产状实质上是空间二斜面相交线的产状,属于立体几何学等数学范畴。地质上早就用赤平投影等方法估测。本文中数学计算方法是对前人方法的补充,精度可高达分、秒。介绍的产状网虽属估测,但制作简便。求解断层两盘相对运动力和总断距等的方法,美国有毕令斯的画法几何,前苏联有莫尔恰诺夫和瓦依涅尔曼的图解分析法。本文的迹线计算法避免了繁杂的作图过程,而所得结果和美、苏方法相同。文章还对断层擦痕、牵引褶皱及断层旁侧派生的节理能否指示相对运动,提出新见。

The respective trace of rock bed, vein must be utilized usually in the study on a fault except the complicated fault, such as deep and big fault. The trace occurrence is substantially the occurrence of intersection line of two oblique planes in space, which belongs to the mathematics field of solid geometry. There was the evaluation method of stereographic projec- tion early in geology. The mathematical calculation method in this paper is a complement to the previous method. The only advantage of it is that its precision can be as high as minute, second. Although the occurrence net in subsidiary introduction belongs to an estimation, the making of it is simple and convenient. As to the method of calculating the relative movement force and total fault displacement of two walls of a fault, there are the method of descriptive geometry and the method of diagram analysis. The trace calculation method in this paper can free from the complicated drawing process and the calculation result is as same as those of the 2 methods mentioned above. In the section 6 of this paper, the new knowledge about whether the fault striae, drag fold and derived joint can indicate the relative movement is put forward （written in 2003 ）.