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约硫砷铅矿在中国的首次发现及其矿物学特征
First discovery of jordanite in China and its mineralogical features
投稿时间:2016-04-06  
中文关键词:约硫砷铅矿  盘龙铅锌矿床  反射率  X射线衍射  硫盐矿物
英文关键词:jordanite  Panlong lead-zinc deposit  reflectivity  X-ray diffraction  sulfosalt minerals
基金项目:
作者单位
束正祥 中南大学 地球科学与信息物理学院, 湖南 长沙 410083 
李帅 中南大学 地球科学与信息物理学院, 湖南 长沙 410083 
谷湘平 中南大学 地球科学与信息物理学院, 湖南 长沙 410083 
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中文摘要:
      约硫砷铅矿是一种较为罕见的硫盐矿物,本文在广西壮族自治区武宣县盘龙铅锌矿区首次发现约硫砷铅矿,主要呈不规则粒状分布于黄铁矿中,与黄铁矿、方铅矿、闪锌矿和重晶石相伴生。在反光显微镜下,约硫砷铅矿双反射明显,白光下的反射率为R1=38.6%,R2=41.8%,反射色为白色略带蓝色色调,具微弱的反射多色性,强非均质性。利用电子探针确定其经验化学式为Pb14.05(As2.66,Sb3.235.89S22.99。采用X射线衍射技术获得了约硫砷铅矿的晶胞参数:a=8.91(2)Å,b=31.96(6)Å,c=8.47(2)Å,β=117.77°,V=2 135.49 Å3,空间群为P21/mZ=2。通过XRD、EPMA等现代岩矿测试分析技术,结合前人对盘龙铅锌矿成矿时代研究的相关资料,还对约硫砷铅矿的成因进行了初步探讨。
英文摘要:
      Jordanite is a rare sulfosalt mineral. This paper reports the first discovery of jordanite in the Panlong lead-zinc deposit, Wuxuan County, Guangxi. The jordanite is associated with pyrite, galena, sphalerite and barite appearing as irregular granular grains in pyrite. The optical characteristics in reflective microscope of jordanite are as follows:double reflection is clear, two reflectivities under white light of jordanite are equal to 38.6% and 41.8% respectively; the reflection color is pure white with a little blue tint; reflection pleochroism is weak; heterogeneity is strong. The empirical formula which is determined by the method of EPMA of jordanite is Pb14.05(As2.66,Sb3.23)5.89S22.99. The cell parameters are inferred by X-ray diffraction techniques. The results are listed as follows:a=8.91(2) Å, b=31.96(6) Å,c=8.47(2) Å, β=117.77°, V=2 135.49 Å3, Z=2, and the space group is P21/m. With the use of XRD and EPMA in combination with previous research on the metallogenic epoch of the Panlong lead-zinc deposit, the authors also investigated the origin of the jordanite.
束正祥,李帅,谷湘平,2018,约硫砷铅矿在中国的首次发现及其矿物学特征[J].岩石矿物学杂志,(5):853~859.
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