南秦岭大型钡成矿带中硫钒铜矿的特征及成因意义  

MINERALOGICAL CHARACTERISTICS AND GENETIC SIGNIFICANCE OF SULVANITE FROM THE LARGE BARIUM METALLOGENIC BELT IN SOUTHERN QINLING MOUNTAINS,CHINA

作　　者：刘家军[1] 杨丹[2] 柳振江[1] 杨艳[1] 毛光剑[1] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室 [2]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿物岩石》2008年第2期44-50,共7页Mineralogy and Petrology

基　　金：国家自然科学基金项目(40573032);国家重点基础研究发展计划项目(编号2006CB403503);高等学校学科创新引智计划(B07011);中国地质大学地质过程与矿产资源国家重点实验室项目(GPMR0527)

摘　　要：在南秦岭下寒武统硅岩建造中的毒重石-重晶石矿床中,产出大量硫钒铜矿。硫钒铜矿呈正方形,长方形及不规则状,粒度大小变化较大,一般为0.01mm～1mm,最大可达7mm。反光显微镜下为淡柠檬黄色,显微硬度134.5kg/mm2～139.8kg/mm2,相当于摩氏硬度3.46～3.50。主要化学成分为:Cu47.18～52.02(平均50.44),V6.50～14.32(平均11.95),Sn0.00～12.85(平均2.15),S31.77～34.34(平均33.29),As0.00～5.12(平均0.86),Fe0.00～3.27(平均0.77),部分样品含有极少量的Fe,Ni,Co,Sb,Se,Te,In。相应的平均化学分子式为Cu3.04(V0.90,Sn0.07,Fe0.05,As0.04,Sb0.01)1.07(S3.98,Se0.02)4.00,简化式为:Cu3(V,Sn,As,Fe)S4。矿物为等轴晶系,晶胞参数值a=0.5392nm。成矿带中硫钒铜矿的形成与钒的富集,与有机质演化受热和生物降解作用有密切联系。Sulvanite occurred in the Lower Cambrian silicalite and slate in the large barium metallogenic belt of southern Qinling Mountains. Samples were collected from witherite, barite, and barytocalcite ores. Sulvanite was disseminated in the ores with square, rectangular or irregular shape and with grain sizes of 0.01 mm～l mm. The mineral was light lemon yellow in color, metallic in luster and brashy,134.5 kg/mm^2 ～139.8 kg/mm^2 （for 50 g load） in microhardness and Moh＇s=3.46～3.50. Electron microprobe analyses of 12 points on sulvanite gave the results as follows（%）.Cu 47.18～52.02 （50.44 on average）, V 6.50～14.32 （11.95 on average）,Sn 0.00～12.85 （2. 15 on average）, S 31.77～34.34 （33.29 on average）, As 0.00～5.12 （0.86 on average）, Fe 0.00～3.27 （0.77 on average） ,corresponding to the formula Cu3.04 （V0.90 ,Sn0.07 ,Fe0.05, As0. 04, Sb0. 01 ） 1.07 （S3.98, Se0.02 ） 4.00, and to a simplified formula Cu3 （V, Sn, As, Fe） S4. The mineral was of cubic system,a=0. 539 2 nm. It was considered that the enrichment of sulvanite and vanadium in the belt would be favored by both heated organic matters and biodegradation.

关 键 词：硫钒铜矿 大型钡成矿带 南秦岭 

分 类 号：P534.41[天文地球—古生物学与地层学]