本书通过多种分析技术结合的方式，研究长江水系沉积物中Fe元素在时空上的变化特征。以Fe元素作为具有普遍性意义的"标识物"或环境替代性指标，从河流沉积物质"源—汇"过程入手，研究其在流域风化剥蚀、河流搬运入海过程中的地球化学循环特征，及其对流域风化环境的响应。本书的主要成果对今后深化长江沉积地球化学研究，尤其是从全球变化和地球系统科学的角度，将长江流域、河口及陆架海作为一个整体，开展系统的陆源入海物质的"源—汇"过程及其环境效应研究具有重要意义。
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