菱铁矿矿床,大部分是由菱铁矿与赤铁矿(镜铁矿)——褐铁矿及磁铁矿组成的混合型铁矿床,有少部分为由菱铁矿或以菱铁矿为主的单一型铁矿床。其地表部分极易氧化成褐铁矿。长期以来,这一类型铁矿,在世界铁矿类型中只占次要地位。一般认为沉积菱铁矿在世界上分布广泛,但矿层很薄,稳定性较差,品位很低,不具工业价值,只有在铁矿资源贫乏的德国、英国才进行开采;在内生作用过程中,菱铁矿主要产于岩浆期后低温热液及火山作用后期,其储量和开采量多不被人们重视。事实上世界许多重要铁矿如北美上湖铁矿及仅次于上湖的中欧侏罗系而状铁矿,其矿物成分除赤铁矿、磁铁矿与褐铁矿外,菱铁矿也占一定比例,部分地区则以菱铁矿为主。在碳酸盐岩中的菱铁矿矿床,多属单一型菱铁矿,其成因有沉积与热液两种不同的看法。下面介绍几个规模 Siderite deposits, most of which are composed of siderite and hematite (specular) - limonite and magnetite mixed iron deposits, a small part of siderite or siderite A single type of iron ore-based mine. Its surface can be easily oxidized to limonite. For a long time, this type of iron ore has only a minor share of the world’s iron ore types. Sedimentary siderite is generally considered widely distributed in the world, but the mine is very thin, poor stability, low grade, not of industrial value, only in poor iron ore resources in Germany, the United Kingdom only for mining; endogenous role in the process Siderite is mainly produced in the late period of low temperature hydrothermal and volcanic activity after the magmatic period, and the reserves and the amount of exploitation are not valued by people. In fact, many of the world’s major iron mines, such as the Upper Lake Iron Ore in North America and the Central European Jurassic and lateritic iron ore from the Upper Lake, whose mineral composition includes, in addition to hematite, magnetite and limonite, siderite Accounting for a certain proportion, while the main area is siderite. The siderite deposits in carbonate rocks are mostly single type siderite, which is caused by two different views of deposition and hydrothermal fluids. Here are some scale