Metallogenic Age and Genesis of Jinshan Gold Deposit, Jiangxi Province, China

The Jinshan gold deposit consists of gold\|bearing ultramylonite and gold\|bearing quartz vein ores. The Rb\|Sr isochron age of fluid inclusions in quartz from quartz veins is the same as that of the gold\|bearing ultramylonite, suggesting that both the types of orebodies were formed simultaneously in the Caledonian period, in the range 406-409 Ma. REE patterns and sulfur, lead, carbon, hydrogen and oxygen isotope data, as well as the composition of fluid inclusions, have shown that the ore\|forming fluids were derived from formation water, and the ore\|forming materials came from the gold\|hosted rocks. The Jinshan gold deposit occurring in a Caledonian brittle\|ductile zone in metamorphosed microclastic rocks owes its origin to Caledonian reworking processes.

金山金矿床成矿时代及矿床成因

金山金矿床由含金糜棱岩及含金石英脉型矿石组成。矿石的石英流体包裹体ＲｂＳｒ等时线年龄测定结果为４０６～４０９Ｍａ，这两种类型矿石的年龄在测定误差范围内基本一致，属于加里东期成矿。稀土元素分布模式、Ｓ、Ｐｂ及Ｃ同位素特征、成矿流体成分资料都说明这两种类型矿石的成矿物质均来自地层，成矿流体属于地层中的建造水及大气降水。

云南墨江金厂金矿床含铬层状硅酸盐矿物成分标型特征

含铬绢云母类矿物在云南墨江金厂金矿床中广泛出现于黄铁铬绢英岩、黄铁硅质岩、黄铁铬云母岩和石英脉中。含铬绿泥石类矿物主要出现在石英脉、硅质岩、黄铁铬绢英岩中。蒙脱石出现于蚀变围岩中 ,而高岭石出现于富金石英脉中。本文通过对 72个上述矿物电子探针数据的分析 ,确定了与其成因产状对应的含铬绢云母、含铬伊利石、含铬绿泥石、含铬蒙脱石、高岭石矿物的系列成分标型。研究表明 ,具最高铬含量的上述矿物样品均位于近金厂岩体穿脉的最北端。在铬铝云母SiO2 -Cr2 O3 关系图上可以看出 ,不同成矿背景的铬铝绢云母 ,其Cr、Si离子数有分区特点 ,而本矿床的铬铝云母成分标型反映其富硅富铬的特点 。

鄂南含金硅化岩的区域分布及其成因探讨

介绍了鄂南含金硅化岩的区域分布、产状特征及硅化期次划分 ,并通过对氢氧同位素组成、微量元素分布、地下热水的水热蚀变作用、硅化蚀变带中残留化石及岩石结构构造、硅化岩阴极发光等资料的综合分析 ,提出了以地下循环热水水热蚀变为主导。

难选泥质金矿石浮选工业试验研究

河南某金矿石中金矿物属于微细粒级金,含量较低,原矿品位仅为2.2g/t,矿石泥化现象较为严重,随着磨矿细度的提高,矿浆黏度加大,严重影响分选效果。采用浮选法富集金矿物,在磨矿细度-0.074mm占75%~80%时,采用MC黄药+丁铵黑药的组合捕收剂,NaCO作为矿浆pH值调整剂,水玻璃作为抑制剂,实现了含金矿物与脉石矿物有效分离,并以此进行了工业试验,获得了金精矿品位为37g/t、回收率达到88.95%的良好指标。