Abstract

The petrographical and geochemical characteristics of some basic sills and dykes from southern Rhenish Schiefergebirge [Germany] are described. The dykes are generally more altered than the sills and are classified into two types according to their relation to the lead-zinc veins found in the area. The distribution of some trace elements in the sills and dykes is given and the nature and mechanism of alteration are discussed.

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