世界核地质科学2025，Vol.42Issue(1)：60-75,16.DOI:10.3969/j.issn.1672-0636.2025.01.005
粤北书楼丘铀矿床黄铁矿标型特征及其找矿意义
Typological characteristics and prospecting significance of pyrite in the Shulouqiu uranium deposit in northern Guangdong
摘要
Abstract
Pyrite is the most common metal sulfide mineral in mineral deposits,mostly formed at the stages of uranium mineralization.Its typological characteristics have important indicative significance for deep mineral exploration and prediction.This article uses electron microscopy,powder diffraction,thermoelectric analyzer,and electron probe system to analyze the typological characteristics of pyrite at different mineralization stages and elevations in the Shulouqiu uranium deposit.The research results show that the n(S)/n(Fe)values of pyrite in this area indicate a deficiency in S characteristics.Analysis of characteristic elements such as δFe,δS,As,Se,Co,Ni,etc.shows that the genesis of pyrite in this area is mainly magmatic hydrothermal.The characteristics of the crystal cell parameters of pyrite indicate that the substitution of S with As in a isomorphic form is the main cause of the increase in a0 and also an important factor leading to the precipitation of U element.The thermoelectric coefficient value(a)of pyrite is-301.0～332.2 μV·℃-1,and the thermal conductivity type is mainly P-type.The formation temperature of pyrite is 74～386℃,belonging to a medium low temperature deposit.The thermal electric coefficient dispersion(δa')of pyrite indicates a mineralization period with a δa'of 82.1,indicating a relatively stable mineralization environment and a weak degree of superposition;The δa'values in the early and late stages of mineralization are 201.6 and 224.9,respectively,indicating that they may have been formed by the superposition of multiple stages of hydrothermal fluids,with a relatively high degree of superposition;The δa'values at each stage gradually decrease with the decrease of levels,and are relatively concentrated,indicating that the mineralization become relatively better as the depth increases.The thermoelectric parameter Xnp of pyrite is-40.0～61.0,and the erosion percentage(γ)of the ore body is 34.8%～60.0%,with an average of 48.9,indicating that the deposit has been eroded to the middle and still has significant extension in the deeper part.Comprehensive analysis suggests that there is still good mineralization and prospecting potential in the deep part of the deposit.关键词
黄铁矿/晶胞参数/热电系数/书楼丘铀矿床Key words
pyrite/unit cell parameters/thermoelectric coefficient/Shulouqiu uranium deposit分类
地质学引用本文复制引用
周堂波,李俊,郭新文,陈军军,张海强,姜春晖,吴通航,马永胜..粤北书楼丘铀矿床黄铁矿标型特征及其找矿意义[J].世界核地质科学,2025,42(1):60-75,16.基金项目
中国核工业地质局铀矿地质项目(编号:202238)资助 Supported by the Central Financial Fund Project(No.202238)under the planning and jurisdiction of the China Nuclear Industry Geological Bureau （编号:202238）
