临朐王庄砂金矿地质特征及其富集规律

GEOLOGICAL CHARACTERISTICS AND CONCENTRATION PATTERN OF WANGZHUANG PLACER GOLD DEPOSIT IN LINQU

摘要:

该砂金矿位于郯庐断裂以西,北邻五井断裂,南靠沂山古隆起,为一河谷阶地型冲积砂金矿床(河二级支流王庄河水系)。砂金矿层主要赋存在全新统底部和更新统底部。矽卡岩型金银铜铁多金属矿床等是本区砂金矿的物质来源。水系主流与支流汇合处支流出口前缘(尤其是出口朝向上游的前缘)、河谷内湾部位、切割岩金矿体的支流细谷、河谷盆地的沉积中心和古河道、冲积层底部靠近基岩,尤其是凹槽部分,是砂金富集的有利地段,并呈现砂金从上源向下游逐渐贫化的规律。

Abstract:

Lying to the west of Tanlu fault zone,south of the Wujing Fault and north of the Yishan ancient uplift, Wangzhuang placer gold deposit is an alluvial one of valley — terrace type (the Wangzhuang River drainage, the second — order tributary of the Mihe River). The ore beds lie mainly at the bottoms of the Pleistocene and Holocene series. The source materials of the placer gold deposit in the area are from skarn — typed Au — Ag — Cu — Fe polymetallic ore. The forelimbs, especially the one pointing to the uppe...