DOI:
矿床地质:1993,Vol.>>Issue(1):38-47

蚌埠-五河地区绿岩带金矿地质特征及控矿因素
安徽地矿局312地质队
Geological Characteristics And Ore-Control Factors Of Gold Deposits In The Greenstone Belt Of Bengbu-Wuhe Area
()
本文二维码信息
码上扫一扫!

摘要
图/表
参考文献
相似文献

摘要点击次数: 2385   全文下载次数: 1950   点此下载全文
        
中文摘要:通过铅,硫、氢、氧同位素以及不同层位、岩石金丰度的大量统计,成矿与构造、岩浆岩关系研究,表明金的成矿作用具有多来源、多成因、多阶段的特点,金矿有明显的层控性,晚太古代西垌堆组绿岩是金的矿源层。区域东西向复武背斜和南北向韧性剪切带分别控制了成矿区和矿田,矿床、矿体的分布。金矿主要形成在燕山期中温,中深成条件下的脆-韧性变形环境。
中文关键词:金矿  绿岩带  矿质来源  韧性剪切带  安徽
Abstract:Large quantities of analyses and statistics of gold abundance in different strata and rocks combined with lead isotope data suggest that greenstone of Late Archean Xigudui Formation is the source bed of gold deposits. The regional EW-trending anticlinorium and the SN-trending ductile shear zones control the distribution of metallogenic provinces and that of ore fields, ore deposits and orebodies respectively. 47% of known gold deposits and ore (mineralization) spots are distributed within or near Tancheng-Lujiang faulted zone, and auriferous quartz veins with economic significance all occur in subsidiary SN-trending ductile shear zones, 1~2 km from the major fault. From Tancheng-Lujiang faulted zone outwards, in conformity with the falling ore-forming temperature and pressure, grain sizes of native gold become smaller, fineness, δ34S values and Co/Ni as well as Se/Te ratios of pyrite decrease, and Au/Ag ratio tends to increase. Strain analysis shows that gold deposits and spots are mostly located in areas where ε=0.6-0.9, while mineralization is rather weak in areas with Zs larger than l or smaller than 0.5. This coincides with the conclusion drawn from the research that gold of wall rocks within the ductile shear zone is most abundant in the moderate shear strain (Y) area, suggesting the mobilization and migration of gold in the strong deformation part and precipitation and enrichment of gold in the moderate strain part. Gold metallization shows polystage, polysource and polygenetic characteristics; nevertheless, the major ore-forming process took place in Yanshanian period in a brittle-ductile deformation environment of intermediate structural layer, with ore-forming temperature 438-132℃, pressure 5.45×107~6.53×107 Pa and depth l.98~2.37 km.
文章编号:    
中图分类号:     
文献标志码:

引用文本:
涂荫玖, 陈成涛.1993.蚌埠-五河地区绿岩带金矿地质特征及控矿因素[J].矿床地质,12(1):38~47
.1993.Geological Characteristics And Ore-Control Factors Of Gold Deposits In The Greenstone Belt Of Bengbu-Wuhe Area[J].Mineral Deposits12(1):38~47
图/表
您是第241861485位访问者  京ICP备05032737号-5  京公网 安备110102004559
主管单位:中国科学技术协会 主办单位:中国地质学会矿床地质专业委员会 中国地质科学院矿产资源研究所
地  址: 北京市百万庄大街26号 邮编:100037 电话:010-68327284;010-68999546 E-mail: minerald@vip.163.com
本系统由北京勤云科技发展有限公司设计 
手机扫一扫