山东旧店金矿1# 脉地质地球化学特征及深部找矿

1#脉为旧店金矿内最大的一条含金石英脉。在总结1#脉矿脉地质地球化学特征、矿化富集规律及其找矿标志等基础上，预测了其深部隐伏矿体。1#脉受长＞ 6 000 m、平均宽＞ 3 m 的北东向断裂构造控制，矿化类型以石英脉型为主。金矿体主要分布在控矿断裂构造宽大部位和在趋向上和倾向上发生明显变化的部位，金矿体群主要分布在煌斑岩和闪长玢岩等脉岩集中分布部位。控矿断裂宽厚，强硅化和强绢英岩化并存，网脉状和细脉状石英脉发育以及闪长玢岩和煌斑岩类出现为矿脉深部出现隐伏矿体的地质标志。根据矿脉中1 000 多个地球化学原生晕样品研究结果，矿脉中As、Sb、Hg 元素组合异常属矿上晕异常，其强异常地段和强异常样品出现指示深部隐伏矿体。根据这些地质和地球化学找矿标志，在1#脉深部预测出4 个隐伏矿体靶区，现已对其中两个靶区进行了坑道工程验证。

Geological and geochemical characteristics and deep prospecting in Lode No.1 in Jiudian gold deposit of Shandong

Lode No. 1 is the largest gold-bearing quartz vein in Jiudian gold deposit． Based on the summaries on the geological and geochemical characteristics，the mineralization enrichment and the geological and geochemical indicators of the lode，the probable location of deeply-seated ore body targets are predicted． Lode No. 1 is controlled by a NE trending，over 6 000 m long and averaging 3 m wide fault，and belongs to gold-bearing quartz vein in type． The gold-ore body occurs mostly in widening location of ore-controlling fractures and changing location of trendency，and the orebodies group distributes in enrichment position of lamprophyre and dioritic porphyrite． The widen portions of the faults，the coexistence of intense silicification and berecitization，the development of quartz stockwork and veinlet and the presence of lamprophyre and diorite porphyrite are the indicators for the probable sites of deep-seated ore bodies． Based on the summary of the studied resuets of more than 1000 geochemical samples， the association of As，Sb and Hg belongs to the head halo elements and the intense anomaly positions and samples reveal the deep-seated ore bodies． Based on above discussion，four ore body targets have been defined，in which two were tested in Lode No. 1 by tunnel engineering．