广西大厂矿区黄铁矿的标型特征研究

本文从化学成分和物理性质方面对大厂黄铁矿进行了标型特征研究。指出大厂黄铁矿的标型特征是:高s/Fe值,高As、Se,低Co、Ni、Te,Co/Ni<1;热电系数高正值;晶胞参数a_0偏大;弱顺磁性。黄铁矿的微量元素特征表明矿床形成与岩浆热液有关,并反映了矿化演化的方向。应用黄铁矿的Sn/Cu比值可以区分矿区内不同的矿床类型。大厂锡矿体中锡石品位与黄铁矿含砷量呈正相关关系,因此,黄铁矿的高砷含量可作为寻找矿体内富锡地段的标志。

A Study of Typomorphic Peculiarities of Pyrite in Dachang Ore Field of Guangxi,China

In this paper, the typomorphic peculiarities of pyrite in Dachang ore field of Guangxi, China, have been investigated according to chemical compositions and physical properties. It is showed that typomorphic peculiarities of pyrite in Dachang ore field are: higher in S/Fe ratios, richer in As and Se, poorer in Co, Ni and Te, Co/Ni<1, higher positive thermoelectric coefficient, higher unit cell a_0 and weak paramagnetism. The microelements of pyrite show that the mineralization of Dachang ore field is related to magmatic hydrothermal solution, and also indicate the evolution trend of mineralization. The different types deposits in the ore field can be distinguished by using Sn/Cu ratios of pyrite. The As-rich pyrite is one of the characteristics of cassiterite-rich ore.