吴川-四会断裂带中段及罗定盆地周边金矿区域成矿规律  

Regional Metallogenic Regularities of Gold Deposits in Middle of Wuchuan-Sihui Fault,Luoding Basin and Surrounding Area

作　　者：杨大欢 古志宏 武国忠 肖光铭 

机构地区：[1]广东省地质调查院,广东广州510080

出　　处：《华南地质与矿产》2012年第2期168-174,共7页Geology and Mineral Resources of South China

基　　金：中国地质调查局项目<全国矿产资源潜力评价>的子项目<广东省矿产资源潜力评价>

摘　　要：吴川-四会断裂带中段和罗定盆地周边各级断裂构造发育,岩浆活动强烈,金矿床(点)众多,是粤西重要的产金地之一。在前人研究的基础上,从金矿控矿因素、成矿演化、空间分布规律等方面对金矿区域成矿规律进行了系统总结。主要结论有:(1)中-新元古代云开群、南华纪大绀山组、震旦纪坝里组和老虎塘组为金的矿源层,在复杂的构造、变质、混合岩化、花岗岩化及岩浆作用中,金不断地被迁移出来,向构造应力集中区段迁移,并最终富集成矿;(2)河台、罗定金矿田受韧性剪切带控制,但韧性剪切带的控制作用主要体现在构造作用产生的巨大应力对金的迁移富集的影响,主成矿期发生在糜棱岩形成之后,新洲金矿田受印支-燕山期逆冲推覆构造控制;(3)金的成矿可划分为三个阶段,包括初始富集阶段、预富集阶段和工业富集阶段,三个阶段构成了一个完整的区域地质-成矿演化系统,不同矿田,由于地质作用特征有差异,成矿演化结构也有所不同;(4)金矿区域分布主要与含金建造的分布及引起金迁移富集的因素有关,花岗岩与围岩接触带和混合岩、混合花岗岩与围岩的过渡带为成矿有利环境;(5)在成矿模式方面,认为凌井生等建立的河台金矿的成矿模式,不但能较好地反映河台金矿田的成矿作用特征,同时也反映了罗定金矿田的成矿作用特征,并结合彭少梅对新洲地区逆冲推覆构造与金矿关系研究成果及新洲地区地质构造特征,建立了新洲地区构造控矿模式。The geological and metallogenic characteristics of middle Wuchuan-Sihui faults zone and Luoding basin area are investigated for summarizing the regional metallogenic regularities of this important gold-producing area in western Guangdong province.The main conclusions are as follows：（1） the ore-forming materials are mainly from Meso-to Neoproterozoic Yunkai Group,Nanhuaian Daganshan Formation,Sinian Beili Formation and Laohutang Formation,which are transported in complex processes in geological history,such as tectonic movement,metamorphism,migmatization and magmatism;（2） Hetai and Luoding gold ore-fields are mainly controlled by ductile shear zone which provided great stress for emigration gold,and the ore-bodies are mainly formed after mylonization,while Xinzhou gold ore-field is mainly controlled by Indo-Yanshanian thrust nappe structure;（3） gold mineralization can be subdivided into three stage,initial enrichment stage,pre-enrichment stage and industrial enrichment stage;（4） the distributive characteristics of gold deposits are related to gold-bearing formation and transportation channel,contact zone of granites and wall-rocks,transition belt of migmatitic granite and wall-rocks are favorable ore-bearing space;（5） metallogenic models are established based on the previous studies.

关 键 词：金矿 控矿因素 成矿规律 成矿模式 吴川-四会断裂带中段 罗定盆地周边 

分 类 号：P618.51[天文地球—矿床学]