摘要
内蒙古察哈尔右翼中旗大清河金矿床类型属于变质-热液型中低温矿床,产出于太古代乌拉山群,矿石类型主要为含金硫化物石英脉和蚀变岩型金矿石。本次工作总结了矿体地质特征及分布规律;结合相关元素测试分析及相邻典型矿床地质特征,综合研究认为区内金元素的物源区主要为太古代乌拉山群,其次为岩浆岩;矿床整体形成于古生代末期至二叠纪中晚期,早期成岩成矿作用形成原始矿床或初始矿源层,晚期受二叠纪中晚期多期次热液流体影响,萃取、活化、迁移金元素形成含金热液流体,并在有利成矿部位充填沉淀,成矿严格受二叠纪花岗闪长岩中NE向及NEE向压扭性构造裂隙控制,矿体具有隐伏再现和雁列式侧伏展布特征。
The gold deposit types in Daqinghe in right wing of Chahar in Inner Mongolia are metamorphic hydrothermal medium and low temperature deposits.It occur in Archean Ula Mountain Group,and the ore types are mainly gold-bearing sulphide quartz veins and alteration rock type gold ores.Based on geological characteristics and distribution of ore bodies in the study area,combining with the test analysis of relevant elements and geological characteristics of adjacent typical ore deposits,it is concluded that the source area of gold elements in the area is mainly Archean Ula Mountain Group,and followed by magmatic rocks.The deposit are formed in the end of Paleozoic to the middle and late Permian.The early diagenetic mineralization is formed in the original ore deposit or initial source layers,and the late Permian is affected by the middle and late Permian multi-stage subhydrothermal fluid,extracting,activating and migrating gold elements to form gold-bearing hydrothermal fluids,and filling and precipitating in favorable mineralization sites.The mineralization is strictly controlled by compressive torsional fractures with the trend of NE and NEE in Permian granodiorite.The ore bodies have the characteristics of hidden reproduction and goose column lateral ambush distribution.
作者
樊培贺
魏迎雨
王宁
FAN Peihe;WEI Yingyu;WANG Ning(No.6 Exploration Institute of Geology and Mineral Resources,Shandong Weihai 264200,China)
出处
《山东国土资源》
2023年第5期1-8,共8页
Shandong Land and Resources
基金
山东省第六地质矿产勘查院,2020年内蒙古自治区察哈尔右翼中旗大清河矿区岩金矿地质勘查项目。
关键词
大清河金矿
压扭性构造带
地质特征
成矿规律
矿床成因
Daqinghe gold deposit
compression and torsion structure
geological characteristics
mineralization rule
origin of the deposit
