辽西北票二道沟金矿的成矿特点和黄铁矿热电性特征

通过对辽西北票二道沟金矿Ⅲ号脉的不同中段的矿石组构、金的分布特点和主要载金矿物立方体、五角十二面体及它形黄铁矿的热电性研究,讨论了成矿特征,计算了成矿温度和矿体剥蚀率并对深部找矿远景进行了预测。研究表明:二道沟金矿金的分布特点存在不均匀性;黄铁矿热电性以P型为主且变化范围宽,只有少量的N型,表明矿体的剥蚀率较低。二道沟金矿可能存在多期次的热液活动,且每一期次相互叠加改造;成矿热液来自南东方向,成矿热液早期温度较高,金属元素大量沉淀温度为150～300℃,属中低温,且不同中段的成矿温度有一定的变化规律。不同晶形的黄铁矿热电性研究表明,不同晶形载金能力不同,黄铁矿热电性P型频率不同,形成的温度不同,但计算的矿体剥蚀率相差不大。

Ore-forming Characteristics and Pyroelectricity of Pyrite of the Erdaogou Gold Deposit, Beipiao, Western Liaoning

According to the ore texture,gold occurrence,shape and pyroelectricity of pyrites of vein Ⅲ in the Erdaogou gold deposit in Western Liaoning,the authors discussed the ore-forming temperatures,denudation rates and evaluated the ore deep prospects.The studies prove that the gold occurrence in the ores was unhomogeneous.The pyrite was mainly P-type and varied widely,with a few N-type,in terms of pyroelectricity,which indicated that a few part of the orebody was removed by uplift and erosion.Possibly,there were several hydrothermal activities superposed each other in the Erdaogou gold deposit.The metallogenic hydrothermal solution came from southeast direction.Though the initial hydrothermal temperature was high,most metal minerals precipitated when the temperature ranged from 150 to 300 ℃,indicating that the Erdaogou gold deposit belonged low-medium hydrothermal type.The pyroelectricity measurements of pyrite indicated that denudation rate was similar,even though the pyrites were different in frequency of P-type,forming temperature and gold content.