山东省乳山市西涝口金矿床金矿物学特征及其意义

Gold Mineralogy and Its Significance of Xilaokou Gold Deposit in Rushan City in Shandong Province

摘要:

西涝口金矿是胶莱盆地东北缘地区典型的金矿床，该区金矿物以单颗粒的自然金为主，有少量的银金矿。粒度多集中在1～37μm；形态多为星点状、角粒状、圆粒状、细脉状、枝杈状等。主要以包体金、粒间金、裂隙金存在于黄铁矿、石英等颗粒中。化学成分中除含Au和Ag以外，还含有Fe、S、Te、Se、Ni、Co等元素检出，其中Fe、S、Te元素普遍存在，推断为中浅成矿作用产物。金矿物成色平均值为864.49,金成色包体金(896.00)→晶隙金(861.79)→裂隙金(846.93)，其中黄铁矿中包体金主要是自然金,成色最高,反映形成温度也最高。

Abstract:

Xilaokou gold deposit is a typical gold deposit in the northeast margin of Jiaolai basin. The gold minerals in this area are mainly single grain natural gold with a small amount of silver-gold. The granularity is mostly concentrated in 1~37μm. The shape is star point type, angular type, round type, vein type and branch type. It mainly exists in pyrite, quartz and other particles as inclusion gold, intergranular gold and fissure gold. In addition to Au and Ag, Fe, S, Te, Se, Ni, Co and other elements are detected in the chemical composition, among which Fe, S, Te elements are universal, which is inferred to be the product of medium-shallow mineralization. The average fineness of gold minerals is 864.49, inclusion gold (896.00)→ intergranular gold (861.79)→ fissure gold (846.93). The inclusion gold in pyrite is mainly natural gold. It has the highest fineness and reflects the highest formation temperature.