甘肃阳山金矿的三源成矿模式与找矿方向

Metallogenic model and prospecting targets in the Yangshan gold deposit,Gansu Province

阳山金矿位于陕甘川"金三角"的松潘—摩天岭金矿带,为一热液成矿的岩金矿床。区内成矿物质来源较复杂,包括矿区的赋矿地层三河口群和中生代花岗斑岩以及矿区南部的碧口地体;总体上阳山金矿带的成矿流体主要是岩浆水,在成矿晚阶段则有大气降水热液进入;区内多期次的岩浆活动为金矿的形成提供了热源。区内矿源、热源、水源丰富,成矿地质条件优越,符合"三源"成矿模式,具成矿远景。下步应加强对矿区成矿规律的研究,寻找新的矿体,同时布置工程进行验证,进一步扩大矿区的找矿规模。

The Yangshan gold deposit is located in the Songpan - Motianling gold mineralization belt in the Shaanxi - Gansu - Sichuan triangle area, it is a hydrothermal rock type gold deposit. The ore - forming material sources are complicated including the ore - bearing host strata of Sanhekou Group, Mesozoic granite porphyry and Bikou terrain in the southern deposit area. In general, the ore - forming fluid in the wholeYanshan gold belt is dominated by the magmatic fluid, and finally the meteoric water which added in the late ore - forming stage. The multiple magmatic activities provide the heat source for the formation of gold deposit. Due to the abundant sources of ore - forming materials, heat and fluids, the metallogenie geological conditions are favorable, therefore, there is great potential for prospecting in the deposit area. The metallogenic model is consistent with the ＂Three - sources metallogenic model＂ of the gold deposit. The next stage exploration should enhance the study of the metallogenic regularities of the gold mineralization in order to find new orebodies, and enlarge the prospecting scope by the test drilling programme.