摘要
本文采用光学显微镜、扫描电镜和电子探针对黑龙江省三道湾子金矿中Au-Ag-Te系列矿物碲银矿、碲金银矿、针碲金银矿、斜方碲金矿和碲金矿进行了详细的矿物学研究,本次研究还发现Au2Te的存在。碲化物矿物多呈粒状或脉状分布于石英或硫化物矿物的裂隙中。Au-Ag-Te系列矿物中,Au含量与Ag含量呈负相关性,与Te含量呈弱的负相关性。结合Au-Ag-Te成分共生图解及镜下特征对金银碲化物矿物共生组合进行分析表明Te优先与Ag结合形成碲银矿或碲金银矿,只有成矿流体中Ag被大量消耗后,Te才与Au结合形成针碲金银矿、斜方碲金矿、碲金矿,最后当成矿流体中Te也被大量消耗后,Au才会形成自然金。氦、氩同位素研究表明石英—黄铁矿阶段流体包裹体中3He/4He值为0.01～0.03Ra,金银碲化物阶段3He/4He值为0.08～1.04Ra,指示金银碲化物阶段有大量地幔物质参与。
By means of optical microscope,scanning electron microscope and electron probe analysis,we made a thoroughly study of the tellurides in the gold deposit of Sandaowanzi,Heilongjiang.Compound Au 2 Te is first discovered in this research,except for hessite,petzite,sylvanite,krennerite and calaverite.These telluride minerals appear as granule,intergrowth or veinlet in the fractures of sulfides and quartz.In the system of Au-Ag-Te tullurides,the content of gold is negatively correlated with the content of silver and has a slightly negatively correlation with tellurium.The paragenetic association of Au-Ag tellurides in sandaowanzi gold deposits has been studied based on the experimental results in Au-Ag-Te ternary system.The experiments show that Te always give priority to combine with Ag to form hessite or petzite,sylvanite,krennerite and calaverite are generated only after a huge consumption of Ag,and only after Te in the fluid consuming a lot can nature gold be generated.Helium isotope studies of fluid inclusions indicate that the ratio 3 He/ 4 He is 0.01～0.03 Ra in the stage of pyrite-quartz,while it is 0.08～1.04Ra in the stage of tellurides,which indicated that large quantities of mantle fluids were involved in the stage of tellurides.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第1期345-356,共12页
Acta Petrologica Sinica
基金
中国地质调查局地质项目(1212011121083)
国土资源部公益性行业科研专项(200811011)联合资助
关键词
HE-AR同位素
碲化物
金矿
三道湾子
黑龙江
He-Ar isotope
Tellurides
Gold deposit
Sandaowanzi
Heilongjiang Province
