福建碧田铜金银矿床中的含银黄铜矿研究  

Ag-BEARING CHALCOPYRITE IN THE BITIAN COPPER- GOLD-SILVER DEPOSIT, FUJIAN PROVINCE

作　　者：陈殿芬[1] 韩秀伶[2] 那建国 钟通德 

机构地区：[1]中国地质科学院矿床地质研究所 [2]中国科学院地质研究所 [3]核工业总公司华南二九五大队

出　　处：《地质论评》1997年第5期529-534,共6页Geological Review

基　　金：中国地质科学院资助项目

摘　　要：福建碧田矿床是成因上与燕山晚期次火山岩有关的铜金银矿床。含银黄铜矿产于该矿床的金银矿石和银矿石中。含银黄铜矿呈粒度约0.004—0.07mm的他形粒状与银金矿、金银矿、自然银、辉银矿、黄铜矿、闪锌矿等共生,在空气中极易氧化。含银黄铜矿的银含量变化在1.045％—14.273％之间,平均值为4.37％。与黄铜矿比较,含银黄铜矿中疏含量变化不大,但铁与银有反消长关系。含银黄铜矿形成于成矿作用晚期银大量富集的金银多金属硫化物阶段和自然银-石英阶段。成矿温度在120—260℃之间,硫逸度1gf_(s_2)=-11.6—-19.5。The Bitian copper-gold-silver deposit is genetically related to Late Yanshanian subvolcanics. Ag-bearing chalcopyrite occurs in the gold-silver ores and silver ores of the deposit. It is anhedral granular, with a grain size of about 0. 004-0. 07 mm, and is intergrown with electrum, kustelite, native silver and argentite. Its color index (Sg) is as follows: Rvis = 41. 5%, x = 0. 366,y=0. 3766, λd = 575 nm and Pe = 22. 96%. Ag-bearing chalcopyrite is oxidized easily in air and forms gaily-colored oxidized film. Electron microprobe analysis of Ag-bearing chalcopyrite shows that the silver content varies in the range of 1. 045%-14. 273%, with a mean of 4. 37%. There is distinct antipathetic relation between Ag and Fe in the mineral; therefore, silver probably replaces iron ismorphously in Ag-bearing chalcopyrite. Ag-bearing chalcopyrite forms at the gold-silver-polymetallic sulfide stage and native silver-quartz stage in the middle-late period of mineralization. The formation temperature vavies between 120℃ and 260℃ , and the sulfur fugacity (lgfs2 ) is -11. 6 to -19. 5.

关 键 词：铜矿床 金矿床 银矿床 银矿 黄铜矿 

分 类 号：P618.410.4[天文地球—矿床学] P618.510.4[天文地球—地质学]