Lead in bottom sediments, nodules, and sulfides from the Black Sea

A study of lead distribution in recent, ancient Black Sea and Neweuxinian bottom sediment shows similar vertical distributions of the element in the oxygen and hydrogen sulfide zones of the sea; i.e. hydrogen sulfide contamination does not affect lead contents in bottom sediments of the sea. Lead distribution in sediment mass of the Black Sea reflects dependence of accumulation of the element on the hydrodynamic regime of the sea and forms of its migration. It is noted that absence of lead accumulation in Black Sea nodules results from specific nodule formation and from geochemical activity of the element. A large role of diagenetic sulfide formation in lead geochemistry is shown. Degree of lead accumulation in iron sulfides depends on conditions of sedimentation and on physical and chemical parameters in the sea.

针对近代、古代黑海及新乌克辛（Neweuxinian）海底沉积物中的铅分布开展的研究表明，该元素在黑海含氧区与硫化氢区的垂向分布特征具有相似性；换言之，硫化氢环境并不会对海底沉积物中的铅含量造成影响。黑海沉积物中铅的分布特征，反映了该元素的富集过程与海洋水动力条件及其迁移形式之间的依存关系。研究指出，黑海结核中未出现铅富集的现象，其成因在于结核的特殊形成机制与该元素的地球化学活性。本研究证实，成岩硫化作用在铅的地球化学过程中发挥着重要作用。铁硫化物中铅的富集程度，取决于沉积作用条件与海洋的物理化学参数。