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The environments in which carbonate sediments accumulate are remarkably diverse, ranging from deep ocean basins to terrestrial lakes and springs. Understanding these settings is essential for interpreting ancient carbonate sequences.
Searching for "extra quality" often leads down a grey path. Many classic texts—like Flügel's Microfacies of Carbonate Rocks or Tucker & Wright's Carbonate Sedimentology —are expensive and not always available through institutional access. As a result, users append "extra quality" to filter results from:
Occurs under elevated temperatures and pressures. Mechanical and chemical compaction occurs, leading to pressure solution seams known as stylolites. The Phenomenon of Dolomitisation origin of carbonate sedimentary rocks pdf extra quality
Because a mole of dolomite occupies approximately 13% less volume than two moles of calcite, this chemical replacement often generates extensive intercrystalline porosity networks. This makes dolomitized intervals exceptionally high-quality reservoirs for hydrocarbons and groundwater. Prominent Hydrological Models for Dolomitization
: Carbonate minerals can precipitate directly from water. This often occurs in warm, shallow, agitated marine environments where the loss of CO2cap C cap O sub 2 The environments in which carbonate sediments accumulate are
Most carbonates form in shallow, warm marine environments where biological activity is highest.
When these organisms die, their remains accumulate on the ocean floor. Over time, these piles of biological debris are compressed and cemented into rock. For a deposit to be "extra quality," this process needs to happen far away from rivers, which carry "impurities" like sand and clay. 2. The Chemical Precipitate The Phenomenon of Dolomitisation Because a mole of
2CaCO3 (calcite)+Mg2+⟶CaMg(CO3)2 (dolomite)+Ca2+2 CaCO sub 3 (calcite) plus Mg raised to the 2 plus power ⟶ CaMg(CO sub 3 close paren sub 2 (dolomite) plus Ca raised to the 2 plus power