Ferroan Dolomitization by Seawater Interaction with Mafic Igneous Dikes and Carbonate Host Rock at the Latemar Platform, Dolomites, Italy: Numerical Modeling of Spatial, Temporal, and Temperature Data

Figure 3

(a) Hand sample of a dolomite vein crosscutting a dike where the sample is unstained. (b) Photomicrograph (plane-polarized light (PPL)) of a dolomite vein crosscutting a reacted pyroxene crystal in a dike. (c) Photomicrograph (PPL) of a stained dolomite sample showing colorless-grey nonferroan dolomite as a cement phase filling pore space between blue-stained ferroan dolomite crystals. (d) Photomicrograph (cross-polarized light (XPL)) of plagioclase and clinopyroxene phenocrysts where the plagioclase is embayed. (e) Photomicrograph (XPL) of a clinopyroxene glomerocryst in a cryptocrystalline groundmass. (f) Photomicrograph (XPL) of a phenocryst that is completely altered to calcite in a cryptocrystalline groundmass. (g) Photomicrograph (PPL) of a clinopyroxene phenocryst that is altered to chlorite along its edges. At the center of the phenocryst, the original mineral can still be recognized. (h) XPL photomicrograph of (g). (i) Photomicrograph (XPL) of feldspar phenocrysts that have been altered to sericite.

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