摘要
与剪切带相关的金矿床在全球范围内普遍发育 ,并往往形成大型、超大型金矿床。剪切带如同一个黄金的“天然生产车间” ,其应变特征和构造演化控制着金的成矿作用。成矿元素主要来源于深部和围岩 ,成矿流体具有多源性 ,主要为C O H体系。剪切带内温度和压力的变化直接影响着成矿流体的运移和成矿元素的沉淀。“断层阀”模式和三阶段模式是目前理解该类金矿床成矿机制的重要认识。在剪切带长期的构造演化过程中 ,构造叠加和区域构造体制转换导致成矿作用的多期性和复杂性 ,使成矿作用规模不断提高 。
Gold deposits related to the shear zone are well developed globally, which are often the large or super-large deposits. The shear zone is just like the natures gold workshop, whose strain features and tectonic evolution control the gold mineralization. Ore-forming elements are mainly derived from the deep and country rocks, and the ore-forming fluids, the C-H-O system, are multi-sourced. Temperature and pressure inside the shear zone directly affect the migration of ore-forming fluids and the precipitation of ore-forming elements. The “fault-valve” model and the three-stage model are the keys to understand the gold metallogenic mechanism related to the shear zone. Tectonic superimposition and tectonic regime transformation occurred during the tectonic evolution of shear zone would result in the multiphase and complexity of mineralization and can improve the gold mineralization to a larger scale, resulting in giant gold belts or gold clusters.
出处
《地学前缘》
EI
CAS
CSCD
2004年第2期393-400,共8页
Earth Science Frontiers
基金
国家重点基础研究发展规划项目 ( 2 0 0 1CB40 980 7
G19990 43 2 11)
关键词
剪切带
构造叠加
成矿元素
成矿流体
金成矿作用
成矿机制
shear zone
tectonic superimposition
ore-forming element
ore-forming fluid
gold mineralization
metallogenic mechanism
