化探在辽宁大杨树沟钼矿发现中的作用与意义

辽宁大杨树沟钼矿位于华北地台北缘燕山台褶带辽西台陷与山海关台拱结合部,八家子—杨家杖子多金属成矿带西段,是近年通过水系沉积物地球化学异常查证发现的一处大型富钼矿床。矿体全部赋存在燕山期细粒花岗岩体内,两者具有密切的时空关系和成因联系。矿体形态为脉状,向深部盲矿体增多,构成密集的矿束。找矿勘查工作经水系沉积物地球化学加密测量,土壤地球化学测量、地质测量和工程验证3个阶段。它的发现说明地质工作程度很高的东部地区仍然具有比较大的资源潜力,区域地球化学异常在矿产勘查中具有重要的向导作用。新一轮重要矿产资源勘查,应首先对成矿区带地球化学异常进行二次开发筛选,按循序渐进的查证工作原则,提高异常查证的工作质量,是多快好省的找矿方法。

Role and significance of geochemical exploration in the discovery of the Dayangshugou molybdenum deposit, Liaoning

The Dayangshugou molybdenum deposit is located at the junction between the Liaoxi (western Liaoning) platform subsidence and Shanhaiguan platform rise in the Yanshan platform fold zone on the northern margin of the North China platform, in the western segment of the Bajiazi-Yangjiazhangzi polymetallic ore belt. It is a large rich molybdenum deposit found during check verification of geochemical anomalies of stream sediments. Orebodies are all hosted in Yanshanian fine granite. There are close temporal-spatial and genetic relations between the deposit and the granite. The orebodies occur as veins and blind orebodies increase toward the depth, forming dense orebody bundles. The exploration work comprised three stages: additional stream sediment geochemical survey, soil geochemical survey, geological survey and engineering check verification. The discovery of the molybdenum deposit shows that there is still great potential for undiscovered mineral resources in eastern China where the degree of exploration is very high. The regional geochemical anomalies play a guiding role in mineral exploration. In the new round of mineral exploration we should firstly exploit and screen the geochemical anomalies in the ore belt the second time, then gradually improve the quality of anomaly check verification and finally carry out exploration, which is an efficient method for mineral exploration.