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本文提出环境是影响微量元素配分的重要因素，并列举了不同侧面的一系列证据或表现。为查明环境影响沉积物元素成分的机理，引进了先进的软硬酸碱（SHAB）理论；通过严格的逻辑推导，建立了氧化还原模式。作为模式的验证，介绍了华北克拉通南缘的实际研究结果，从而有力地证明了氧化还原模式的科学性和环境影响沉积物化学成分的重要性。与此同时，根据华北克拉通南缘沉积物REE型式的演化，推论2300Ma时发生了全球地质环境的突变。
This paper proposes that the environment is an important factor affecting the distribution of trace elements and lists a series of evidences or manifestations on different sides. In order to find out the mechanism of environmental impact on the elemental composition of sediments, an advanced theory of soft and hard acid-base (SHAB) was introduced; through rigorous logical derivation, a redox mode was established. As a validation of the model, the actual research results of the southern margin of North China Craton are introduced, which proves the importance of the scientificity of the redox model and the influence of the environment on the chemical composition of the sediments. In the meantime, according to the evolution of REE patterns of sediments in the southern margin of North China Craton, it is deduced that a sudden change in the global geological environment occurred at 2300 Ma.