摘要
芹菜洋金矿床中含金石英与无矿石英经常相伴产出。研究结果表明,含金石英系晚阶段产物,其颜色多种,粒度细小,富含Au、Ag、As、Al、K、Na等元素,无矿石英则相反。石英含金性及气相包体成分(CO_2+H_2+CH_4)/N_2比值可用来指示本区金矿化程度和规模,当石英含金量大于0.5×10^(-6)时指示该区有金矿床存在,含金量小于0.1×10^(-6)者可视为该区无矿,介于两者之间时有金矿化显示;气相包体成分(CO_2+H_2+CH_4)/N_2比值在0.08左右,可指示出现金矿床,当无矿时石英中的(CO_2+H_2+CH_4)/N_2比值明显高一个数量级。金矿石英脉无论是重矿物——磁铁矿、赤铁矿、黄铁矿等含量,还是成矿元素Au、Ag、Bi、Mn、S含量,抑或Cu+Pb+Zn,Cr+Ni+Co+V总量,都比无矿石英脉高出1—3个数量级,可作为金矿石英脉和无矿石英脉的判别标志。
The associated existance of gold-bearing quartz and dead quartz has been commonly found in the deposit. The gold-bearing quartz formed in late phase is characterized by varied colours, fine grain size, and riehing in Au, Ag, As, A1, K and Na etc. while dead quartz bare reverse features. Both gold content and gas-inclosure constituent ratio (CO_2+H_2+CH_4)/N_2 in quartz can be treated as indicators for gold mineralization grade/scale in the area. The gold contents larger than 0.5×10^(-6) or less than 0.1×10^(-6) reveal gold deposit or dead lode respectively while the value lying in between them shows gold mineralization. There would be gold deposit when the gas-inclosure constituent ratio (CO_2+H+2+CH_4)/N_2 is about 0.08, and no ore if this ratio is an order higher than 0.08. All heavy mineral con tents (i. e. magnetite, hematite and pyrite etc.), ore-forming elements (Au, Ag, Bi, Mn, S), and total contents of Cu+Pb+Zn and Cr+Ni+Co+V in gold-bearing quartz veins are 1-3 orders higher than those in dead quartz lodes. Consequently, they can be used as keys for identifing these two kinds of quartz veins.
出处
《福建地质》
1991年第1期22-33,共12页
Geology of Fujian
