摘要
便携式X荧光分析(pXRF)具有原位、无损、快捷、多元素同时分析等优点,是近年来快速发展的一种分析方法。研究能否利用pXRF数据提取深部岩性、矿化信息在深地探测中具有实际意义。本文利用pXRF对曹四夭斑岩型钼矿床钻孔岩芯进行高密度原位测量,获取了34种元素的831个数据,分别求取花岗斑岩、浅粒岩、变粒岩和辉绿岩的读数均值,并将之与实验室分析结果进行对比。结果表明,pXRF数据能有效地刻画不同岩性的化学组分,其读数的变异系数对矿物的成分差异程度具有较好的指示作用。进一步利用主成分分析方法提取出分别代表花岗斑岩、辉绿岩和变质岩的三组元素组合,进行组合元素的分布、富集等与地层、岩体、蚀变矿化等的空间耦合关系研究。结果表明,高密度的原位测量数据能减小pXRF样品代表性影响,有助于获取全面、准确的岩性组分结果,可为深部精密地球化学信息的获取和定量分析提供信息。
Portable X-ray fluorescence analysis(pXRF)is a fast developing analytical method for field chemical analysis in recent years,as it has the advantages of in-situ,nondestructive,fast,and multi-element simultaneous analysis.Whether the pXRF data can be used to extract information of lithology and mineralization in depth is an important scientific issue for the mineral exploration.In this paper,we have carried out the high density in-situ measurement of three drilling cores of the Caosiyao porphyry Mo deposit by using the pXRF,obtained data of 34 elements of 831 samples,and respectively calculated average values of analytical results of various elements of granite porphyry,leptite,granulite,and diabase.The pXRF data have been compared with laboratory analytical results of representative samples.It is found that the pXRF data can be used to effectively distinguish chemical composition of different types of rocks.Meanwhile,the variation coefficients of pXRF readings are good indicators of the degrees of chemical composition differences among minerals of rocks.In addition,three element associations representing granite porphyry,diabase,and granulite have been respectively obtained by using the principal component analysis.This provided a new insight for the research of the spatial coupling relationship between the distribution and enrichment of elements and element associations and the strata,intrusive rocks,alteration and mineralization.This study shows that the high-density in-situ pXRF measurement data are helpful to reduce the representative influence of samples,to obtain comprehensive and accurate results of lithological components,and to provide a basis for the acquisition and quantitative analysis of precision geochemical information of rocks in depth.
作者
袁兆宪
周树斌
常浩
丁军召
张生元
汪海城
YUAN Zhao-xian;ZHOU Shu-bin;CHANG Hao;DING Jun-zhao;ZHANG Sheng-yuan;WANG Hai-cheng(Institute of Resource and Environmental Engineering,Hebei Geo-University,Shijiazhuang 050031,China;School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;No.1 Term of Hebei Bureau of Geology and Mineral Resource Exploration,Handan Hebei 056000,China;No.2 Institute of Henan Bureau of Geo-exploration and Mineral Development,Xuchang Henan 461000,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2020年第5期973-982,共10页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点研发计划项目(2016YFC0600501)
国家自然科学基金资助项目(41602338)
河北省教育厅重点项目(ZD2017011)
中国地质调查局地质调查项目(DD20190459)。
关键词
便携式X荧光分析
原位测量
高密度
岩芯
垂向剖面
主成分分析
曹四夭钼矿床
portable XRF(pXRF)
in-situ measurement
high density
drilling core
vertical profile
principal component analysis(PCA)
Caosiyao Mo-deposit
