摘要
为寻找凤县二里河铅锌矿床成因类型证据,利用电子探针显微分析对二里河铅锌矿床金属硫化物进行分析,研究结果表明二里河铅锌矿床内黄铁矿含有两种不同类型:一种黄铁矿Co/Ni值为0.04~1.68,平均值为0.57,显示沉积成因(Co/Ni<1),矿物受后期热液熔蚀改造,形成时期较早;另一种黄铁矿Co/Ni值为0.98~7.67,平均值为2.46,显示热液成因(Co/Ni>1),产于主矿体中,与铅锌成矿关系密切。闪锌矿中Fe的含量存在明显差异,划分为含铁闪锌矿(4%~8%)和闪锌矿(<2%),推测可能是由于成矿过程的叠加改造所致,Zn/Cd比值为346~698,属中高温。矿物标型特征研究表明该矿床属于层控-岩浆热液型成因。
In order to prove the genetic type of Erlihe Pb-Zn deposit in Fengxian County,the metal sulfide in the deposit was analyzed by electron probe microanalysis.The results showed that there were two different types of pyrite,the Co/Ni value of one type of pyrite was 0.04~1.68,with an average value of 0.57,indicating sedimentary origin(Co/Ni<1),the mineral was formed earlier and subsequently remolded by hydrothermal erosion.The other type of pyrite was with Co/Ni value of 0.98~7.67,and an average of 2.46,indicating hydrothermal origin(Co/Ni>1),which occurred in the main ore body,and was closely related to Pb-Zn mineralization.There are obvious differences in Fe content in sphalerite,which can be divided into ferric sphalerite(4%~8%)and sphalerite(<2%).It is speculated that it may be caused by the superimposed transformation of the mineralization process.The Zn/Cd in the sphalerite is 346~698,which belongs to medium and high temperature.The study of mineral typomorphic characteristics indicates that the deposit is the stratabound-magmatic hydrothermal origin.
作者
张斌
张革利
陈浩
刘晨
ZHANG Bin;ZHANG Ge-li;CHEN Hao;LIU Chen(No.717 Co.Ltd.of Northwest Nonferrous,Baoji 721015,Shaanxi,China)
出处
《世界地质》
CAS
2021年第2期265-272,共8页
World Geology
基金
陕西省凤太矿集区找矿预测项目(DD2016005213)。
关键词
标型特征
黄铁矿
闪锌矿
二里河铅锌矿床
凤县
typomorphic characteristic
pyrite
sphalerite
Erlihe Pb-Zn deposit
Fengxian County
