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金矿床密集区受含金丰度高的岩石圈地幔区控制和制约。本文以华北地台若干金矿床密集区为例,从地壳演化的角度,初步探索了初始地壳的含金丰度变化与金矿床密集区的关系。文章认为,初始地壳只有经活化改造和活化再造,才能形成金元素的富集域或金矿床密集区。金矿床密集区的形成是矿源、热源、搬运介质和构造条件的统一体。其中,前寒武纪古老变质基底是金矿形成的物质基础,变质基底双层结构的下层结构是金矿床的主要赋存部位,岩浆一热构造作用是初始地壳内成矿物质活化的动力,岩浆活动、流体运移是矿质的搬运工具,构造断裂是含矿热液运移的通道和聚集的空间,特别是深断裂能使深源成矿物质迁移至地壳,使矿质来源更加丰富。
The gold deposits are controlled and restricted by the lithospheric mantle area with high gold abundance. In this paper, taking several gold deposits in the North China Platform as an example, the relationship between the gold abundance in the initial crust and the gold deposits is preliminary explored from the perspective of crustal evolution. The article believes that the initial crust can be formed only gold-rich areas or gold-rich areas only through activation transformation and reactivation. The formation of the gold deposits is a unified source of ore, heat, transport media and structural conditions. Among them, the ancient Precambrian metamorphic basement is the material basis for the formation of gold deposits. The underlying structure of the metamorphic basement double layer structure is the main deposit of gold deposits. The magmatic-thermal tectonism is the motivation for the activation of ore-forming materials in the initial crust. Magmatic activity and fluid migration are the tools of transporting minerals. Tectonic fault is the passage and accumulation space for ore-bearing hydrothermal migration. Deep fractures in particular can migrate deep-sourced ore-forming materials to the earth’s crust and enrich the mineral sources.