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A database of 492 whole-rock analyses, about two-thirds of which include both major and trace elements, was compiled for early Mesozoic diabase dikes from central Virginia through South Carolina. The database was examined for compositional patterns that could be related to magma modification caused by crystal-melt equilibria (“mineral control”), source effects, or both.

The principal conclusion drawn from consideration of major and compatible trace elements, as well as phenocryst assemblages, is that compositions of the rocks were affected by low-pressure crystal fractionation/accumulation involving some combination of olivine, chromian spinel, plagioclase, and clinopyroxene. The sequence of crystallizing minerals affecting melt compositions,...

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