摘要
金矿床形成和成矿预测一直为国内外学者所关注。随绿岩带金矿、暗色岩易富金及赤铁矿总含有大粒金等不断地被发现,指示矿物磁性对金矿床形成有一定的控制作用。1)金粒级的大小与磁体间作用力的强弱呈正比,磁力的大小与两磁体间距离的平方呈反比,这正、反比规律进一步解析绿岩带富金机理和强、弱磁性岩石富金条件的差别。2)电流在金、黄铁矿和磁黄铁矿等附近每一点都能产生磁化场(H场)和磁通密度(B场),H场和B场的大小与不同成矿介质具有一定的正比例关系,按此比例可追踪含矿流体形成过程和富金条件。3)根据矿物磁性特征,建立了矿物磁力晕、矿物磁性矢量等找矿标志。4)除温度和压力等因素外,矿物磁性特征应视为金矿床形成和预测主要条件之一。
Gold deposit forming and metallogenetic prognostication have been worked for a long time at both home and abroad. Our study demonstrated that formation of gold deposits in greenstone belt and gold-bearing dark rock series, and hematite containing big gold grain gold might be controlled by mineral magnetism. The main point views were as follows. 1) To analyze the gold-bearing mechanism in greenstone belt and the gold-bearing conditions in different magnetic rocks, the relations between gold grain size and magnetic force strength were revealed. 2) Near the electric minerals (gold, pyrite and pyrrhotite), electric current could produce a magnetic and a magnetic flux fields (H field and B field), the both fields having a relation with metallogenetic medium, based on the both formation process of ore-bearing liquid and condition of gold enrichment being traced. 3) The markers, such as mineral magnetic halo and mineral magnetic vector, for discovering ore deposits were set up based on the mineral magnetic characters. 4) The mineral magnetism should be regarded as one of main conditions in gold deposits forming and metallogenetic prognostication in addition to temperature and pressure.
出处
《地质科学》
CAS
CSCD
北大核心
2005年第1期32-39,共8页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金(批准号:40272051)
国家自然科学重点基金(批准号:40234051)联合资助
