甘肃省徽县头滩子金矿地质特征及远景预测

徽县头滩子金矿是近年来在西秦岭东部地区发现的规模较大的新类型金矿床。文章通过对区域成矿地质背景的分析研究，结合头滩子金矿的地质特征，总结了该区金矿的控矿因素，初步认为，泥盆系和石炭系含碳细碎屑岩和碳酸盐岩建造含金背景值较高，为金成矿矿源之一；印支期及燕山期花岗斑岩、正长斑岩及脉岩为金成矿提供热源和深部矿源；东西向、北东向、北西向三组断裂交汇显示出环形构造特征，构成聚矿场。以金矿为中心，向外扩散以后出现锑矿和汞矿，属低温成矿系列。该矿床在西秦岭东部南缘具有代表性，据初步预测，该矿区有一处大型金矿产地，在矿区外围有3个找矿靶区。

Geological characteristics and gold resource prognosis of Toutanzi gold ore district in Huixian County, Gansu Province

The Toutanzi gold deposit in Huixian County of Gansu Province is a large-size new type gold deposit recently discovered in the eastern part of West Qinling region. Based on a study of regional gold metallogenic background and geological characteristics of gold mineralization, this paper sums up factors controlling the gold oreforming process in the Toutanzi gold ore district. It is held that the Devonian and Carboniferous carbonaceous fine clastic and carbonate formation with relatively high gold background constituted one of the gold ore resources, that the Indosinian and Yanshanian granitic and syenitic porphyries and relevant dikes provided heat source and deep ore resource for gold mineralization, and that the ring structure formed by EW-, NE- and NWtrending faults eventually led to the formation of gold ore resources in this region. In addition, antimony and mercury deposits occur outwards around the gold deposit, showing metallogenic zonation and suggesting an epithermal ore-forming association. The Toutanzi gold ore district is of representative significance in the eastern part of west Qinling region, as evidenced by the existence of a large-size mineral deposit in the ore district and three prospecting targets in the periphery areas.