关于前寒武纪大型条带状铁建造的成因问题已争论了一个多世纪。尤为使人感兴趣的是铁和二氧化硅的来源,对此有两种基本意见,一是火山成因,一是认为来自地表风化。争论最热烈的是关于早元古代铁建造的成因, The cause of formation of the large Precambrian banded iron has been debated for more than a century. Of particular interest are the sources of iron and silica, which have two basic ideas, one is the origin of volcanoes, and the other is thought to be from surface weathering. The hottest debate is about the causes of early Proterozoic iron construction,