个旧矿区龙岔河岩体的接触构造研究

STUDY OF CONTACT STRUCTURES OF LONGCHAHE ROCKBODY IN GEJIU MINE

龙岔河花岗岩体具有一定的分异,可以划分出边缘相和内部相。岩体北西缘见断层接触,也见超覆侵入接触。推测岩体产状为似蘑菇状的岩盖。根据岩石斑晶走向的两组最大发育方向及其夹角的规律性变化,推测岩浆侵位方式是由南往北再向东的顺时针螺旋式上升。这方面的研究对个旧西区成矿预测和进一步找矿中具有指导意义。

Lonechahe sranite mass uossesses some differentiation, and it can be di-vided into marginal tacies and internal tacies. Faulted contact is round and overlapping intrusive contact is also found at northwestern margin of the ro-ckbody. The attitude of the rockbody is inferred as mushroom-shaped laccolith. According to the two groups of maximum developed directions of the strikes of rock phenoctysts and to the regular changes of their angles, the mode of magmatic emplacement is inferred as the magma ascends clockwise and in spi-rals from south to north then to east. If the inference is correct, it will be of guiding sense to metallogenic prognosis and further search for mineral de-posits in western Gejiu area.