dolomite

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dolomite

A general term for a specific form of calcium-magnesium carbonate that may used as a calcium supplement to ensure healthy bones, which is mined in the Dolomites in northeast Italy. Some of the mineral deposits are contaminated with heavy metals (lead, cadmium, etc.), for which the FDA sets a maximum level of 5 ppm (which dolomite exceedes).
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Cements have mostly occupied the fractures and zones of dolomitization (Fig.
The identification of matrix type is difficult because of dolomitization of the matrix in the microfacies.
XRD analyses indicate that these samples are highly CaCO3 pure (87 %-92 % CaC[O.sub.3] content), and no petrological evidences of dolomitization have been observed (Fig.
Some of the diagenetic processes were also observed in the formation, including compaction, cementation, dolomitization and bioturbation.
It contains ellipsoidal primordial facies, complete dolomitization and vuggy porosity of touching-vug type.
The process of dolomitization has largely destroyed primary textures as well as fossils.
Carbonate diagenesis includes such major processes as cementation, microbial micritization, neomorphism, dissolution, compaction, and dolomitization and it operates in three main environments: marine, near-surface meteoritic, and burial (Tucker & Wright 1994).
The mineralization process (ore development, calcitization, dolomitization and silification) resulted in the higher toughness of the rocks and in the lower porosity and absorbability.
Ore in the Los Lamentos district is associated with dolomitization of limestone, the dolomite forming aureoles averaging 15 meters in thickness which in some cases surround the ore.
Bioturbation influences dolomitization patterns in carbonate rocks
Post-mound early diagenesis including calcite cementation and dolomitization was controlled by a second period of subaerial exposure after the mound had become buried beneath peritidal mudstone.