鲁西铜石金矿田找矿成果及成矿机制探讨

Study on Exploration Achievements and Metallogenic Mechanism of Tongshi Gold Field in Western Shandong Province

铜石金矿田为山东省鲁西地区重要的金矿集区,1989—1994年勘查评价的归来庄金矿床,被原地质矿产部定义为“新地区、新类型、新发现”,更是改写了鲁西地区无大型金矿床的格局。近年来,铜石金矿田金矿找矿取得了可喜的成果,累计发现大型金矿床1处、中型金矿床1处、小型金矿床3处、金矿点10余处,已查明上表的金金属量近50吨,目前已经成为山东省继胶东之后的第二大黄金生产基地。区内发现的金矿床类型复杂多样,其成矿主要与中生代铜石杂岩体、断裂构造关系密切,具有优越的金矿成矿地质条件和较大的资源潜力。本文在系统总结、归纳分析不同类型矿床地质特征基础上,从成矿时代、成矿物质来源、成矿温度、矿化富集规律等方面对成矿机制进行了探讨,认为区内矿床属铜石潜火山中低温热液型金矿床。

Tongshi gold field is an important gold ore concentration area in Luxi in Shandong province.Guilaizhuang gold deposit evaluated in 1987 is defined by the former Ministry of Geology and Mineral Resources as a“new area,new type,new discovery”.It has rewritten there is no history of large scale gold deposits in western Shandong province.In recent years,gold prospecting in Tongshi gold field has achieved many achievements.1 large scale gold deposit,1 medium scale gold deposit,3 small scale gold deposits,and more than 10 gold deposits have been discovered.The amount of gold metal has been found to be nearly 50 tons.It has become the second largest gold producing area in Shandong province.The types of gold deposits discovered in the area are complex and diverse.The mineralization is mainly related to Mesozoic Tongshi complex and fault structures.It has good gold ore forming geological conditions and great resource potential.Based on a systematic summary and analysis of geological characteristics of different types of deposits,metallogenic mechanism in terms of mineralization age,ore forming source,ore forming temperature,and mineralization enrichment rules have been studied.It is believed that deposits in this area belong to Tongshi subvolcanic middle low temperature hydrothermal gold deposits.