韧性剪切带型金矿研究进展

韧性剪切带型金矿是一种重要的金矿成因类型。韧性剪切带型金矿主要具有以下特征:(1)主要分布在板块边缘;(2)矿体呈上部陡倾、下部平缓的脉状分布,垂向延伸远大于水平延伸;(3)不同矿化类型在同一部位叠加出现;(4)成矿物质和成矿流体呈多源性。区域深大断裂和大规模韧性剪切带控制着金矿田的展布,次级的韧性剪切带控制了金矿床的产出,韧性剪切带是这类型金矿的主要控矿因素。具较高金背景值的古老绿岩带和韧性剪切带中的岩浆作用,是韧性剪切带型金矿成矿的有利条件。韧性剪切带型金矿中金的活化迁移是伴随着韧性剪切作用进行的。成矿流体的闪蒸作用和沸腾作用是金卸载和富集的重要机制。韧性剪切带型金矿的成矿作用过程经历了多期次、多阶段的复杂过程。此外,本文对韧性剪切带型金矿的有效勘查手段进行了归纳,并展望了韧性剪切带型金矿研究的发展。

Research progress of the ductile shear zone type gold deposit

The ductile shear zone type gold deposit is an important genetic type of gold deposit. It is mainly distributed in the plate margin. The ore body of ductile shear zone type gold deposit appears in veined, which the upper part is steep and the lower part is gentle, and the vertical extension is much larger than the horizontal extension. And di.erent mineralization types are superimposed at the same location. The ore-forming materials and ore-forming fluids are multi-source. Regional deep faults and large-scale ductile shear zones control the distribution of gold fields. The secondary ductile shear zone controls the occurrence of gold deposits. Ductile shear zone is the main ore controlling factor of this type of gold deposit. Ancient greenstone belt with high gold background value and magmatic actions are favorable conditions for mineralization of ductile shear zone type gold deposit. The activation and migration of gold in ductile shear zone type gold deposits are accompanied by ductile shearing. Flash evaporation and boiling of ore-forming .uids are important mechanisms for gold unloading and enrichment. The mineralization process of ductile shear zone type gold deposits has experienced a complex process of multiple stages. In addition, the e.ective exploration methods of ductile shear zone type gold deposit are also summed up. Finally, the development of research on ductile shear zone type gold deposit is discussed.