金川铜镍硫化物矿床磁黄铁矿标型矿物学特征及其地质意义
Typomorphic Mineralogical Characteristics of Pyrrhotite in Jinchuan Copper Nickel Sulfide Deposit and Its Geological Significance
DOI: 10.12677/AG.2022.126076, PDF,  被引量   
作者: 赵 翔, 赖健清：中南大学有色金属成矿预测与地质环境监测教育部重点实验室，湖南 长沙；中南大学地球科学与信息物理学院，湖南 长沙；艾启兴, 王韵棋：金川集团股份有限公司，甘肃 金昌
关键词: 金川矿床；磁黄铁矿；标型特征；岩浆通道系统；Jinchuan Deposit； Pyrrhotite； Typomorphic Characteristics； Magma Conduit System
摘要: 金川矿床作为世界第三大铜镍硫化物矿床具有重要的研究价值。前人在矿物学的研究主要集中在橄榄石、辉石等硅酸盐矿物上，而对成矿物质本身的硫化物矿物研究较少。本文采用X射线衍射、电子探针分析等方法，对不同构造类型矿石中磁黄铁矿的结构状态与化学成分作了研究。结果表明，浸染状、海绵陨铁状矿石中磁黄铁矿产出特征和矿物组合较为相似，其中前者以高温六方相为主，主要为高温岩浆经历缓慢降温结晶形成，后者则为高温六方相和低温单斜相的交生体，经历了岩浆的快速降温结晶过程；而块状矿石中磁黄铁矿产出特征和矿物组合与上述类型矿石差异较大，主要为高温岩浆经历快速降温结晶形成。根据块状硫化物矿石所在位置以及在该区分布特征，推断岩浆通道入口最有可能分布于II矿区东部的中间位置。
Abstract: Jinchuan deposit is the third largest copper nickel sulfide deposit in the world, which is of great research value. Previous mineralogy studies on Jinchuan deposit mainly focused on silicate min-erals such as olivine and pyroxene, but less on sulfide minerals. In this paper, the structural state and chemical composition of pyrrhotite of ores with different structural types have been studied by X-ray diffraction and electron microprobe analysis. The results show that the occurrence characteristics and mineral assemblages of pyrrhotite in disseminated and sideronitic sulfide ores are relatively similar. The pyrrhotite in these ores is mainly high-temperature hexagonal phase and contains a very small amount of low-temperature monoclinic pyrrhotite. And they are mainly formed by slow cooling crystallization of high-temperature magma, but it has experienced rapid cooling crystallization locally. The occurrence characteristics and mineral assemblages of pyrrhotite in massive ores are quite different from those of the above types of ores, which is mainly formed by rapid cooling crystallization of high-temperature magma. According to the location and the distribution characteristics of massive sulfide ore in this area, it is inferred that the entrance of magmatic channel is most likely to be located in the middle of the east of mining area II.
文章引用：赵翔, 赖健清, 艾启兴, 王韵棋. 金川铜镍硫化物矿床磁黄铁矿标型矿物学特征及其地质意义[J]. 地球科学前沿, 2022, 12(6): 776-783. https://doi.org/10.12677/AG.2022.126076

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