摘要
以智利月亮山铁氧化物铜金型矿床为例,利用磁化率K对铁磁性矿物及蚀变岩的现场识别能力和X射线荧光分析仪(PXRF)快速分析元素含量功能,结合矿床地质以闪长岩(5.5×10-3SI<K<17.9×10-3SI)、角砾岩(0.35×10-3SI<K<0.7×10-3SI)、磁铁矿(K>753.4×10-3SI)、磁赤铁矿(313.3×10-3SI<K<753.4×10-3SI)、赤铁矿(0.78×10-3SI<K<1.62×10-3SI)、镜铁矿(0.67×10-3SI<K<0.78×10-3SI)等划分闪长岩亚相、角砾岩亚相、磁铁矿微相、磁赤铁矿微相、赤铁矿微相、镜铁矿微相;以PXRF现场测量铁含量>30%,铜含量>0.5%为含矿(化)界限,确定磁化率-铁铜含量对应关系:高磁化率-高铁含量-磁铁矿型、低磁化率-高铁含量-赤铁矿型(镜铁矿)、低磁化率-低铁含量-蚀变岩型,及岩相学找矿标志-矿物标志、构造标志、闪长岩标志、蚀变分带标志和矿物蚀变标志等,对月亮山矿区进行深部找矿预测。
This paper presents an analysis for identification of ferromagnetic minerals and altered rocks using magnetic susceptibility （ K）, and a quick analysis of element contents using X-ray fluorescence analyzer （PXRF） in the Moon Mountain iron oxide copper-gold （]OCG） deposits, Chile. According to deposit geology, based on magnetic susceptibility, rocks are characterized by diorite with 5.5×10-3SI〈 K 〈17.9×10-3SI, breccia with 0. 35 ×10-3SI〈 K 〈0.7 ×10-3SI, magnetite with K〉753.4 ×10-3 SI, maghemite with 313.3×10-3 SI 〈 K 〈753.4×10-3 SI, hematite with 0.78×10-3 SI〈 K 〈1.62×10-3SI and specularite with 0.67×10-3SI〈 K 〈0.78×10-3SI. And based on these data, th rocks can be divided into diorite subphase, breccia subphase, magnetite micro facies, maghemite micro facies, hematite micro facies and specularite micro facies. Taken PXRF analysis of iron content〉30% and copper content〉0.5 % for mineralization limit, we determine the relationship of the magnetic susceptibility with iron and copper content as high sus- ceptibility-high iron content-the type of magnetic, low susceptibility-high iron content-the type of hematite（pyrite） and low susceptibility-low iron con- tent-altered rocks. In addition, the markers of petrography-minerals, structures, diorite, alteration zoning and mineral alteration are summarized in an ef- fort to prospect orebodies at depth in the Moon Mountain ore district.
出处
《地质与勘探》
CAS
CSCD
北大核心
2012年第2期396-405,共10页
Geology and Exploration
基金
科技部科研院所技术开发研究专项资金(2011EG115022)资助
关键词
IOCG
磁化率
X荧光分析
岩相学
智利
IOCG, susceptibility, X-ray fluorescence analysis, petrography, Chile
