山东英格庄金矿床构造控矿特征及深部预测

英格庄金矿床位于山东牟乳金矿带巫山断裂的南缘,其围岩主要以古老变质岩与昆嵛山花岗岩为主,为含金石英脉型金矿。文章通过对英格庄金矿床控矿断裂发展史以及断面几何形态与金矿体赋存位置关系的研究,发现矿体在断层带中的分布具有规律性。深部地球化学原生晕研究表明,英格庄金矿床Bi与Hg关系非常密切,是金矿化的最佳指示元素,且在已知矿体下方出现前缘晕与尾晕相互叠加的现象。结合矿体在断裂中分布的规律以及原生晕特点,对英格庄矿床深部第二富集段进行了预测,并预测在-220m下有第二金富集段存在,且具有很大的经济价值。

Ore-controlling features and deep-seated metallogenic prognosis of Yinggezhuang gold belt, Shandong Province

Located on the southern margin of Wushan fault in the Mouping_Rushan gold ore belt of eastern Shandong, the Yinggezhuang gold deposit is of the quartz vein gold type. Its wall rock is mainly composed of Archean metamorphic rocks and Kunyushan granite. The authors studied the development of the ore_controlling fault in the gold deposit and the relationship between the geometric shape of Wushan fault and the position of gold ore bodies and, on such a basis, summed up the distribution regularities of the ore bodies in the fault. An investigation of the deep geochemical primary halos reveals that Bi is closely related to Hg in the Yinggezhuang gold deposit, which can serve as the best indicator elements for minieralization. There exists the superposition of the front halo with the rear halo. Using the distribution regularity of the ore bodies in the fault and characteristics of the primary halo, the authors have made metallogenic prognosis for the Yinggezhuang deposit. It is predicted that the second gold concentration sector beneath the known ore body exists at the level of -220 m, which has very promising economic value.