紫金山金铜矿明矾石的拉曼光谱特征  

Raman Spectra Characteristics of Alunite in the Zijinshan Gold-Copper Deposit

作　　者：王翠芝[1,2] 熊欣[3] 

机构地区：[1]福州大学紫金矿业学院,福建福州350108 [2]福建省矿产资源重点实验室,福建福州350108 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《光谱学与光谱分析》2014年第2期415-420,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41072067);国家"十一五"科技支撑计划项目(2009BAB43B04)资助

摘　　要：紫金山金铜矿是我国大陆首例高硫化型浅成低温热液型矿床。矿床上金下铜，金矿主要赋存在潜水面以上，与强硅化有关；铜矿主要赋存于潜水面之下，与明矾石化有关。明矾石有四种产出状态，分别为蚀变岩型、与铜硫化物共生型、后期脉状、粉末状。不同产出状态的明矾石具有不同的拉曼光谱特征和荧光散射背景。明矾石流体包裹体激光拉曼谱图显示：（1）从蚀变岩型、与铜硫矿化物共生型到后期脉状明矾石均具有明矾石特征性的谱带，只是受荧光散射影响逐渐减弱；粉末状明矾石具有与前三者不同的谱带特性，各谱带强度均较弱，荧光散射较强烈。（2）100～700 cm -1区间谱带可作为明矾石分子结构中阳离子类质同象置换的“指纹谱带”。蚀变岩型明矾石，161和234 cm -1峰变化明显，具有较广泛的N a对K的类质同象置换；与铜硫化物共生的明矾石，381和484 cm -1峰变化明显，指示Cu和Ga等阳离子对Al离子的类质同象置换；后期脉状明矾石，161，234，484，508 cm -1峰值均比较稳定，Na对K和Si对Al的类质同象置换较少；潜水面附近的粉末状明矾石因荧光散射强烈，各个谱带强度均较弱。（3）明矾石的激光拉曼光谱和红外光谱配合使用，可为明矾石矿物研究提供完整的分子振动光谱特征，为明矾石的成因提供结构信息。在岩相学、矿相学、矿床地质、矿床地球化学、区域地质特征研究的基础上，通过明矾石的激光拉曼光谱（结合荧光散射背景）可进一步为紫金山金铜矿这个典型的高硫化型浅成低温热液矿床的形成机制提供演化进程信息。The Zijinshan gold-copper deposit is the first one of high sulfidation epithermal hydrothermal deposits .The gold bodies up ,and the copper bodies down .The gold bodies mainly occur above the ground water table associated with strong silici-fication ,and the copper bodies mainly occur below the ground water table associated with alunitization .The alunite of the Zijins-han gold-copper deposit has four types of occurrence status ,that is the altered rock type ,the intergrowth-with-Cu-sulphide type ,the vein type and the powder type .Different types of the alunite are of different Raman spectra characteristics and fluores-cence scattering background .Laser Raman spectra of inclusions in the alunite show that ：（1） The characteristics of the Laser Raman spectra of the alunite are of characteristic spectral bands of alunite ,just fluorescent scattering weaken gradually from the altered rock type ,the intergrowth-with-Cu-sulphide type to the vein type ;the alunite in the Powder type has different bands of the Laser Raman spectra relative to the former three types ,the intensity of each band is weaker ,and it’s fluorescent scattering＆amp;nbsp;intensity is strongger .（2） The bands in 100~700 cm -1 of the Laser Raman spectra can be used as ＆quot;fingerprint＆quot;bands indicating the condition of the cation replacement in the molecular structure of alunite .The intensities at 161 and 234 peak change obviously in the bands of the alunite in the altered rock type ,which indicating a wide replacement between K and Na ;the intensities at 381 and 484 peak in the bands of the alunite in the intergrowth-with-Cu-sulphide type change significantly ,indicating Al can be re-placed with Cu ,Ga ,etc .;the larger and stable intensities of the alunite in the vein type in the bands at the peaks about 161 , 234 ,484 ,508 ,etc .indicate that there are less chances with the replacement between K and Na ,Al and Si;fluorescence scator-escent scattering is very strong and the intensity of each band is weaker in the bands of th

关 键 词：紫金山 金铜矿 明矾石 激光拉曼光谱 荧光散射 

分 类 号：P619.212[天文地球—矿床学]