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安徽省姑山铁矿床的矿石产在中生代辉长闪长岩与以三叠纪页岩、粉砂岩和砂岩为主的围岩的接触带上。矿石成分主要是微晶赤铁矿,其粒径为0.01-0.05mm,并与玉髓和细粒石英相交生。粒径达1-2mm的赤铁矿斑晶呈板状自形晶浸染于块状矿石中。显微镜观察表明,赤铁矿自形斑晶是在成矿期后由赤铁矿微晶聚合而成的。整个聚合过程包括微晶颗粒的相互靠近、颗粒旋转、结晶方位的定向以及最终的焊结,从而形成光性均一的变斑晶。本文提供了聚合过程各阶段的显微镜照片。
The ore from the Gushan iron deposit in Anhui Province is produced at the contact zone between the Mesozoic gabbro and the surrounding rock dominated by Triassic shale, siltstone and sandstone. Ore composition is mainly microcrystalline hematite, the particle size of 0.01-0.05mm, and with chalcedony and fine grained quartz students. The hematite porphyrite with a particle size of 1-2 mm is in the form of plate-like self-infiltrated into massive ore. Microscopic observation showed that the hematite self-shaped porphyrite was polymerized from the hematite microcrystalline after the mineralization. The entire polymerization process includes the close proximity of the crystallite particles, the rotation of the particles, the orientation of the crystallographic orientation and the final soldering, so as to form the optically uniform speckle. This article provides microscopic photographs of the various stages of the polymerization process.