Abstract
The Phanerozoic history of the Earth was marked by recurrent oceanic anoxic events (OAE) accompa� nied by outbursts of plankton bioproductivity and extinction of more evolved animal and plant groups. Such processes resulted in accumulation of sediments enriched in organic matter and sulfides. For the sake of brevity, let us call them carbonaceous metalliferous sediments (CMS). Some researchers [1–4 and others] noted that accumulation of CMS members was preceded or accompanied by volcanic eruptions, which resulted sometimes in the formation of large magmatic prov� inces. The significant role of volcanic activity during accumulation of such sediments is confirmed by the isotopic analysis of S, Mo, Rb, Sr, Os, and Nd in rocks
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