山东招远-平度断裂带夏甸金矿深部成矿特征研究

Zhaoyuan-pingdu fault belt in Jiaodong ore concentration area is a well-known gold deposits-controlling fault belt. A series of large gold deposits are distributed in this belt. The Xiadian gold deposit is a typical one of these gold deposits with a deepest metallogenic depth of 1400m. The deep metallogenic characteristic of it is often ambiguous and raises wide concerns. This application chooses Xiadian gold deposit as the research object with a focus on an analysis of ore deposit characteristics and complex processes of geotectonics- diagenesis- metallogenesis through the following research: (1) Detailed investigation on the characteristics of ore-controlling fault structure, including its mechanical properties, tectonic activity and stages so as to set up a tectonic system. (2) High-precision mineralogical and geochemical analysis. Objective to investigate the deep metallogenic process, material source, genesis and the age of mineralization. (3) Make prediction about deep ore prospecting from geochemical halo data and the collected geophysical information. (4) Comprehensive study on the deep metallogenic characteristic and enrichment rules so as to set up a deep geology- geophysics- geochemistry prospecting model. This project will help to understand the deep metallogenic characteristic of gold deposits from Zhaoyuan-Pingdu fault belt, and provide important information for further prospecting of such deposits.

山东招远-平度断裂带是胶东矿集区内著名的金矿控、容矿断裂，带内产有大尹格庄、夏甸等大型金矿床和多处中、小型金矿床。产于招平断裂带内的夏甸金矿勘查深度已达-1400m，具有开展深部金矿地质特征研究的优势条件。课题拟从构造-成岩-成矿作用入手，通过开展控容矿断裂的成矿结构面研究，以探讨控矿构造形成的力学性质、运动方式、活动期次等，建立构造体系；通过开展矿床学、矿物学、同位素地球化学等方面研究，探讨深部金矿成矿过程、物质来源、形成时代及成因；利用成矿指示元素的前缘晕、近矿晕和尾矿晕对深部盲矿体或矿化富集带作出地球化学判断，结合对区内已获得的V8、EH-4 等深部物探探测成果资料，总结招远-平度断裂带夏甸段深部金矿成矿特征和富集规律，建立金矿床深部地质-地球物理-地球化学找矿模型，为开展胶东地区深部金矿找矿提供指导。

本项目按照设计的总体思路，通过详细的野外地质调查，并结合科学合理的测试研究手段取得了一些新的成果和新的认识，完成了项目的各项预期目标。课题研究最鲜明的亮点是系统地提出了胶东地区金矿成矿理论体系，概括起来是独特色的四位一体的构造叠置成矿背景、挤压-伸展的交替式构造-岩浆-成矿作用模式和壳幔混合多源流体成矿物质来源。胶东金矿成矿规律集中体现在三期金矿成矿热事件、三个金矿成矿系列和三次金矿成矿期上。同时对胶东金矿提出了全新的概念与注释，认为胶东金矿在同一的大地构造背景环境下、由同一成矿作用形成的具有成因相同、时代相近、在不同构造部位、不同围岩条件形成的一系列金矿自然类型组合，它不是单一的矿床类型，而是反映构造环境、成矿背景、成矿物质来源与成矿规律的金矿成因系统。胶东金矿具有全新的金矿成因内涵，它反映的既有金矿矿床类型的组合，又有金矿成因特征的鲜明特色，是对金矿理论的提升和升华，它跳出了传统的金矿类型划分从单一成因类型或矿床类型划分的樊篱，也大大丰富了有关金矿成矿理论，是对金矿成矿理论研究的重要贡献。