PALEOECOLOGICAL SIGNIFICANCE OF THE BANDED IRON-FORMATION + THE DEPOSITIONAL ENVIRONMENTS OF PRECAMBRIAN BANDED IRON-FORMATION [2 PAPERS]

I discussed the role of siderite in the developmental age and the Precambrian iron structure. Various types of iron ore are described and their position in sedimentary iron ore evolution is outlined. Siderite is the main mineral in the iron ore deposit of the Precambrian period, and in mineralized iron ore it becomes a secondary mineral with a sequential action and a sequential action.

A large amount of iron deposits were seen in the iron layer of the strip. These strata are a type of rock in which alternating thin layers of iron oxide and less iron shale and meteorite belt alternate. These iron bands were built 3.7 billion years ago and 1.8 billion years ago. Starting from the historical time, the iron compounds mentioned are used as pigments (compared with meteorites) and also to the color of the various strata, eg Buntsandstein (Bunter, UK). In Germany's Eisensandstein (such as the Jurassic "iron sandstone" in Donzdorf and the UK bass stone) iron pigments contribute to the pale yellow color of many historic buildings and sculptures. The well-known red color of the surface of Mars comes from a weathered layer rich in iron oxide.

The structure of the striped iron is important as an indicator of the source of iron and the evolution of the atmosphere. The striped iron ore structure is a special sedimentary rock where alternating layers of iron-rich (red) and iron diffused (gray) layers overlap (Figure 7-4 on page 237). Most of this type of rock is over 2 billion years ago. They account for the majority of iron ore mined in the world today. Weak oxidation of iron formed by striped iron strongly indicates that oxygen has begun to accumulate in the environment at that time.