论文部分内容阅读
本文从区域地球物理场特征、本区前寒武纪早期地层的组成特点和划分对比、岩相建造古地理环境、古构造变形及其对变质铁矿的控制作用,提出本区地壳早期演化分为四个阶段:1.太古代陆核形成阶段;2.边缘褶皱带阶段;3.晚太古代统一地块分裂和早元古代断裂或拗陷槽地形成阶段;4.华北地台统一基底形成阶段。本区太古代变质铁矿分三种类型,主要成矿期受晚太古代嵩阳期东西构造控制,而后又受早元古代五台和中岳运动南北向构造迭加改造。造成同类型矿床东西成带,不同类型南北成行的分布格局。
Based on the characteristics of regional geophysical field, the compositional features and differentiation of strata in the Precambrian in this area, the paleogeographic environment of lithofacies-making, palaeo-tectonic deformation and their controlling effects on metamorphic iron ore, this paper proposes that the early crust evolution For the four stages: 1. Archean continental nucleus formation stage; 2. Marginal fold belt stage; 3. Late Archean unified block division and Early Proterozoic fault or depression groove formation stage; 4. North China unified platform Formation stage. The Archean metamorphic iron ore in this area is divided into three types. The main mineralization period is controlled by the East-West Songyang period of the Late Archean. Later, it was rebuilt by the structures of the Early Proterozoic Wutai and the Zhongyue Movement. Resulting in the same type of deposit into something, with different types of North-South distribution pattern.