The Euxinic Basin Oxic/Anoxic Transition in Modern and Ancient Sediments

这是对黑海和美国宾夕法尼亚页岩现代沉积物中氧-缺氧过渡的比较研究。收集了黑海岩心样品和宾夕法尼亚岩石样品，分别来自缺氧、过渡和缺氧环境。PI将对黄铁矿进行硫同位素分析，并对黄铁矿硫、有机碳、活性铁和总铁、无机磷和有机磷进行化学分析。化学分析将通过x射线平板技术与沉积结构（生物扰动、层压等）的测定紧密结合。该结果将用于验证现有理论，并为：(1)正常海洋与含氧沉积物的区分提供新的范例；(2)同生黄铁矿与成岩黄铁矿的区别；(3)富氧/缺氧过渡区内磷（和锰）富集物的形成。

This is a comperative study of the oxic-anoxic transition in modern sediments of the Black Sea and of some Pennsylvania shales in the U.S. The Black Sea core samples and the Pennsylvania rock samples from oxic, transitional, and anoxic environments have been collected. The PI will undertake sulfur isotopic analysis of pyrite and chemical analyses for pyrite sulfur, organic carbon, reactive and total iron, and inorganic and organic phosphorus. The chemical analyses will be closely integrated with determinations of sedimentary texture (bioturbated, laminated, etc.) via X-ray slab techniques. The result will be used to test current theories and develop new paradigme for: (1) the discriminaation of normal marine from euxinic sediments; (2) the discrimination of syngenetic from diagenetic pyrite; (3) the formation of phosphorus (and manganese) enrichments within oxic/anoxic transition zones.