枞阳井边金矿金的赋存状态研究

井边金矿位于下扬子台坳、长江褶皱断裂隆起带中段。金矿体赋存于三叠系中统铜头尖组中 ,矿体形态呈不规则脉状。矿石类型主要有以含金褐铁矿为主的氧化矿石和以含金黄铁矿为主的原生矿石两大类。通过矿相鉴定 ,单矿物含金分析、物相分析、多点分析及电子探针分析等 ,查明了载金矿物系列特征的金的赋存状态。金矿物以自然金为主 ,其次为银金矿。金的粒度较细 ,主要为中细粒显微金。金的嵌布类型有包体金、晶隙金及裂隙金 ,金的成色较高 ,平均为 91 0 .4。金主要呈矿物态存在。

Study of mode of occurrence of gold in the Jingbian gold deposit ,Zongyang County

The Jingbian gold deposit is located in the middlepart of the Changjiang fault fold upwarding zone within the Lower Yangtze syneclise. The gold orebodies, in the irregualr veindike form, occurs in Middle Triassic Tongtoujian Formation. There are two major ore types, namely, oxidized ore dominated by gold bearing limonite and primary ore dominated by gold bearing pyrite. By means of ore microscopy, gold analysis of individual minerals, phase analysis, poly spot analysis and electron microprobe analysis, the mode of occurrence of gold is identified. Gold minerals are mainly native gold and less commonly electrum. Gold is rather fine in granulity and comprises mainly medium or fine grained micro gold. The mosaic types of gold include inclusion gold, gold in intercrystal pore and fissure gold. Gold has quite high fineness (910.4 on the average) and exists chiefly as minerals.