Abstract

Sector zoning refers to a compositional difference between coeval growth sectors in a crystal and results from differences in fluid-crystal element partitioning between nonequivalent faces of the crystal. Sector zoning involving the trace elements Mg, Mn, Fe, and Sr is common in natural calcite cements, and sector zoning of Mn has been induced in synthetic calcite crystals. Differences in surface structure between nonequivalent faces are seen as the principal causes for face-dependent partitioning.

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