| 山东乳山金矿中金-银碲化物的矿物学特征与沉淀机理 |
| |
| 引用本文： | 胡文瑄,孙国曦,张文兰,王昭坤.山东乳山金矿中金-银碲化物的矿物学特征与沉淀机理[J].矿物学报,2005,25(2):177-182. |
| |
| 作者姓名： | 胡文瑄 孙国曦 张文兰 王昭坤 |
| |
| 作者单位： | 南京大学,地球科学系,内生金属矿床成矿机制国家重点实验室,江苏,南京,210093;山东黄金集团有限公司,山东省黄金工业局,山东,济南,270000 |
| |
| 基金项目： | 国家自然基金项目（批准号：49973001）. |
| |
| 摘 要： | 通过显微鉴定和应用电子探针微束分析，查明乳山金矿中碲化物主要为碲银矿和碲金银矿，少量碲铅矿和碲铋矿，它们呈密切共生的集合体或联生体产出在黄铁矿等硫化物及石英等脉石矿物粒问或裂缝中。碲银矿和碲金银矿中Au含量变化较大，w（Au）为痕量至26．1％，与银呈负相关，与铋为正相关，可能是以类质同象形式替代Ag进入到碲银矿中；碲铅矿中未检测到金。金在金-银碲化物中的含量随温度降低而升高，相关矿物的形成顺序为碲银矿-碲金银矿-（碲金矿）。将金银碲化物成分投到Au-Ag-Te三元成分，共生图解上发现，它们都不是标准成分的端元矿物，推测这些碲化物（尤其是金银碲化物）是在非平衡状态下快速沉淀形成的，可能与含矿浠体的闻歇忡沸腾作用有关。
|
| 关 键 词： | 金矿 碲化物 共生关系 沉淀机制 |
| 文章编号： | 1000-4734（2005）02-0177-06 |
| 收稿时间： | 2004-08-02 |
| 修稿时间： | 2004年8月2日 |
Au-Ag TELLURIDE MINERALS AND THEIR PRECIPITATION MECHANISM IN THE RUSHAN GOLD DEPOSIT, SHANDONG |
| |
| HU Wen-xuan,SUN Guo-xi,WANG Zhao-kun,ZHANG Wen-lan.Au-Ag TELLURIDE MINERALS AND THEIR PRECIPITATION MECHANISM IN THE RUSHAN GOLD DEPOSIT, SHANDONG[J].Acta Mineralogica Sinica,2005,25(2):177-182. |
| |
| Authors: | HU Wen-xuan SUN Guo-xi WANG Zhao-kun ZHANG Wen-lan |
| |
| Abstract: | Based on microscopic observation and electron probe micro-analysis (EPMA), telluride mineralsin the Rushan gold deposit,Shandong province, were studied and their compositions were measured. The major telluride minerals are hessite and petzite, with some alaite and tellurobismuthite intergrowthed, occurring as a closely paragenetic group (aggregate) in inter-crystal porosesor fractures of sulfides and gangue minerals.The contents of gold in hessite and petzite vary largely from trace to 26.1wt%, which is believedto occur as an isomorphic formof Ag in hessite. Gold is negatively correlated with silver. In addition, Au seems to have a positive correlation with bismuth, but it is bellow the detectionlimit in altaite.Therefore, Au occurs mainly in hessite and petzite. In combination withrecent achievementsin literature, it is suggestedthat gold contents in the Au-Ag telluride tend toincreasewith decreasing temperature, and the precipitation sequence should be hessite-petzite (calaverite). By putting the measured data into the diagram of the Au-Ag-Te ternary system,it can be seen that the compositions of the telluride minerals do not fit thoseof the end members in the diagram. It is believedthat the telluride minerals were precipitated inanunequilibrium system, which could be relatedto an unstable ore-forming system because of boiling processes during the formation of the deposit. |
| |
| Keywords: | gold deposit telluride minerals paragenetic relationship precipitation mechanism |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
