Cements have mostly occupied the fractures and zones of dolomitization
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.
Hydrothermal (thermobaric) dolomitization
: Rock fabrics and organic petrology, in R.
Some of the diagenetic processes were also observed in the formation, including compaction, cementation, dolomitization
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.