陕西柞水-山阳金铜银多金属矿集区典型矿床模型和找矿预测

柞水-山阳金铜银多金属矿集区成矿条件优越, 找矿潜力较大, 区内可划分出与晚侏罗世—早白垩世构造-岩浆热液活动相关的金、铜、银、铁、铅、锌、锑成矿亚系列, 与晚三叠世中酸性岩浆活动相关的钼、钨成矿亚系列, 与泥盆纪热水喷流沉积作用相关的碳酸盐岩容矿的铜、铁、铅、锌、银成矿亚系列等5个。归纳总结了矿集区金铜银多金属矿床找矿标志, 分别建立了夏家店金矿床、池沟铜钼矿床、银洞子银铅多金属矿床、龙头沟金矿床、王家坪金矿床的综合找矿模型。通过区内综合找矿方法、找矿模型的具体运用, 进行找矿预测, 取得了较好的找矿进展。在圈定的夏家店和风沟-西田家沟2个找矿靶区预测金资源量42 t、银资源量450 t、铅资源量4×104 t。提出了研究区金铜银多金属矿床找矿预查选区、普查评价和详查勘探3个阶段不同的找矿方法技术组合, 为研究区进一步的找矿工作提供了参考模型和方法依据。

Typical deposit model and prospecting prediction of the Zhashui-Shanyang Au-Cu-Ag polymetallic ore-concentration area,Shaanxi Province

The Au-Cu-Ag polymetallic deposit has favorable ore-forming conditions and great prospecting potential in the Zhashui-Shanyang ore concentration area. The area can be divided into five sub-series of Au-Cu-Ag-Fe-Pb-Zn-Sb minerogenetic sub-series related to tectono-magmatic hydrothermal activity in the Late Jurassic-Early Cretaceous, Mo-W minerogenetic subseries related to intermediate-acid magmatic activity in the Late Triassic and Cu-Fe-Pb-Zn-Ag minerogenetic subseries of carbonate-host related to hot water jet deposition in the Devonian period. The prospecting criteria of the Au-Cu-Ag polymetallic deposit are summarized. The comprehensive prospecting models of Xiajiadian Au deposit, Chigou Cu-Mo deposit, Yindongzi Ag-Pb polymetallic deposit, Longtougou Au deposit and Wangjiaping Au deposit are established respectively. Through the concrete application of comprehensive prospecting method and prospecting model in the area, the prospecting prediction has been made, and better prospecting progress has been achieved. The amount of gold, silver and lead resources are 42 tons, 450 tons and 400 000 tons respectively in the two ore-prospecting target areas of Xiajiadian cond Fenggou-Xitianjiagou. In this paper, the author puts forward a combination of different prospecting methods in three stages: pre-prospecting and selecting area, general survey and evaluation, and detailed exploration, which provides a reference model and method basis for further prospecting in the area.