华北地台北缘黑色岩系金成矿作用与成矿机制——以内蒙古浩尧尔忽洞金矿为例

Gold deposit in black shale is one of gold deposit types with great economic significance in the world. More and more gold deposits discovered in black shales in the northern margin of the North China Craton(NCC) in recent years indicates a great ore-forming potential and prospecting potential. As a newly discovered large gold deposit, there is little research on the Haoyaoerhudong gold deposit. Guided by the metallogenic system theory, the Haoyaoerhudong gold deposit will be investigated in detail. Comparison with research on the Zhulazhaga gold deposit and the Saiwusu gold deposit, ore-forming conditions, characteristics, ore-controlling factors and ore-forming regularities will be studied to elucidate the source, evolusion and deposional physicochemical environment of the ore-forming materials. Ages of different geological events related to gold mineralization will be tested through modern isotopic dating methods to reconstruction gold ore-formation processes. To view ore-forming process is part of the regional geodynamic evolusion, this program will reveal the contribution of mesoproterozoic rifting, orogenic process, metamophism and tectonic-magmatism to regional gold mineralization. The aim of this program is to acquire a better understanding of gold ore-forming mechenism and to build a distinctive superimposed gold ore-forming model. It is very important both to enrich the study of superimposed metllogenic theories of China and to guide regional gold exploration in the NCC.

黑色岩系中金矿床是经济意义重大的金矿类型之一。华北地台北缘黑色岩系中近年不断发现大型金矿床，展示出良好的金成矿潜力和找矿前景。浩尧尔忽洞金矿床2005年完成详查工作，地质研究薄弱。本项申请以成矿系统理论为指导，以浩尧尔忽洞金矿床为主要解剖对象，结合对比朱拉嘎金矿床和赛乌素金矿床，深入研究黑色岩系中金矿的形成条件、成矿特征、控矿因素和成矿规律，查明成矿物质来源、演化以及沉淀富集的物理化学环境；厘定与金成矿作用有关地质事件的年龄，重现金成矿作用过程；将成矿作用置于区域地球动力演化的背景下，揭示华北地台北缘中元古代裂解过程及其后续造山、变质作用、构造-岩浆活动对金成矿的制约。从而更深刻地理解黑色岩系中金矿床的形成机理和赋存规律，建立具有研究区特色的叠加复合金成矿作用模式，对于丰富、发展我国叠加复合成矿作用理论和研究内容，以及指导研究区金矿找矿工作都具有重要意义。