铁是地球化学家所熟悉的、也是很感兴趣的一个重要元素,其原因是:一是它富集成矿,对国民经济极关重要;二是它广泛分布各类岩石之中,特别是沉积岩(包括分散沉积物)之中,加上它的某些地球化学特征,如价态的变化,给各类岩石的形成变化的研究提供了有效的证据.如大家所熟知的沉积地球化学环境分类,即所谓氧化环境与还原 Iron is familiar to geochemists and is also an important element of interest for the following reasons: First, it is rich in mineralization and is very important to the national economy; secondly, it is widely distributed among various types of rocks, especially sedimentary rocks (Including dispersed sediments), coupled with some of its geochemical characteristics, such as valence changes, to provide evidence of the formation of various types of rock changes, such as the well-known sedimentary geochemical environment classification , The so-called oxidation environment and reduction