庞家河金矿韧性剪切带特征研究  

Study on the Characteristics of Ductile Shear Zone in the Pangjiahe Gold Deposit

作　　者：李鹏贝 LI Pengbei(School of Geosciences and Resources,Changan University,Xi’an Shaanxi 710054)

机构地区：[1]长安大学地球科学与资源学院

出　　处：《河南科技》2019年第34期95-97,共3页Henan Science and Technology

基　　金：陕西省地质调查院资助项目“秦岭成矿带典型矿集区勘查成果集成与技术支撑研究”（214027160195）

摘　　要：秦岭凤县庞家河金矿位于华北板块与扬子板块之间的商丹加里东结合带中的次级混杂岩带,即唐藏-商丹构造混杂带。庞家河金矿主要出露地层为泥盆系舒家坝组和大草滩组,主要含矿岩层为舒家坝组的绢云千枚岩、粉砂质千枚岩。本文通过对矿区内多种控矿构造样式宏微观特征等进行调查发现,区内地层岩石构造均明显发育脆-韧性剪切变形变质特征,表明研究区岩层经历过强烈的韧性剪切作用。研究认为,脆-韧性剪切带是庞家河金矿的重要控矿构造。从地层岩石变形变质、矿体形态、矿石类型等来看,均体现出韧性剪切带型金矿特征。在"赋金地层-脆-韧性剪切带-热液活动"共同作用下形成庞家河大型中低温微细粒浸染型金矿。The secondary hybrid rock band in the combined belt between the North China plate and the Yangtze plate in the Pengjiahe gold deposit in Fengxian, Qinling-Tangzang-Shangdan construction hybrid belt,The main exposed strata of Pangjiahe gold deposit are Devonian Shujiaba formation and Dacaotan formation. In this paper, through the investigation of the macro and micro characteristics of various ore-controlling structural styles in the area, it was found that the formation rock structures in the area are obviously characterized by brittle-ductile shear deformation and metamorphism, which indicated that the strata in the study area had experienced strong ductile shear. It is considered that the brittle-ductile shear zone is an important ore-controlling structure of Pangjiahe gold deposit. According to the deformation and metamorphism of strata and rocks, the shape of orebody and the type of ore, all of them show the characteristics of ductile shear zone type gold deposits. Large medium-low-temperature micro-fine disseminated gold deposits in the Pangjiahe River were formed under the action of "gold-bearing strata-brittle-ductile shear zone-hydrothermal activity ".

关 键 词：脆-韧性剪切带 控矿构造 庞家河金矿 

分 类 号：P618.510.1[天文地球—矿床学]