安徽五河地区岩浆岩及构造对金矿的控制作用

The control effect of magmatic rocks and structures on the gold deposits in Wuhe area of Anhui Province

为研究五河地区金矿床与岩浆岩、构造之间的内在关系,通过重磁异常推断隐伏岩体的分布特征,研究岩浆岩与金矿床的空间分布关系、成矿流体的同位素特征以及郯庐断裂带对金矿床的控制作用。结果显示金矿床大多位于已知岩体或隐伏岩体的边缘,区内各矿床的成矿流体相似,H-O同位素图解中石英样品点大部分落入岩浆水范围,部分落入变质水范围。岩浆岩为金矿成矿提供了重要的物质来源,岩浆的侵入引起了变质岩系的活化,两者形成的混合流体为金元素的运移和富集提供了热源,在金矿和形成过程中活化了金元素,成矿流体沿主干断裂的NNE—NE向次级断裂运移、富集、成矿。

In order to invstigate the relationship between gold deposits and magmatic rocks or structures,the authors in this paper have analyzed the spatial relationship between magmatic rocks and gold deposits,the isotope characteristics of ore-forming fluids and the control effect of Tan-Lu fault zone on the gold deposits,after analyzing the gravity and magnetic anomalies to infer the distribution characteristics of hidden rock masses.The results show that most of the gold deposits are located on the edge of the known or hidden rock bodies and the deposits in the area have similar ore-forming fluids.Most of the quartz sample points fall into the magma water range in the H-O isotope diagram,and other points fall into the range of metamorphic water.The magmatic rocks provide an important material source for the formation of gold deposits and the intrusion of magma causes the activation of metamorphic rock series.The mixed fluid provides heat source for the migration and enrichment of the gold element,and activates the gold element during the formation of gold deposits.The ore-forming fluids migrate,enrich,and mineralize along the NNE-NE secondary faults of the main fault.