No modern primary dolomite forms in normal seawater at ambient temperatures. Yet ancient dolostones are massive.
Carbonate rocks are of immense economic value:
After millions of years of compaction, cementation, and chemical wrestling, the carbonate sediment becomes rock. We name it by its texture (Dunham classification): origin of carbonate sedimentary rocks pdf extra quality
CO2 (aq)+H2O⇌H2CO3⇌H++HCO3−⇌2H++CO32−CO sub 2 (aq) plus H sub 2 O is in equilibrium with H sub 2 CO sub 3 is in equilibrium with H raised to the positive power plus HCO sub 3 raised to the negative power is in equilibrium with 2 H raised to the positive power plus CO sub 3 raised to the 2 minus power When calcium ions ( Ca2+Ca raised to the 2 plus power ) bind with carbonate ions ( CO32−CO sub 3 raised to the 2 minus power ), precipitation occurs:
Carbonate precipitation is favored by high temperatures, low pressure, and breaking waves—conditions that drive off CO₂ and shift the carbonate equilibrium toward precipitation. No modern primary dolomite forms in normal seawater
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Coccolithophores (algae) and planktonic foraminifera secrete LMC tests, forming the primary engine for deep-sea pelagic ooze accumulation since the Jurassic. Biophysically Mediated Precipitation We name it by its texture (Dunham classification):
For professionals, students, and enthusiasts alike, the ultimate resource remains the PDF edition of James and Jones’s Origin of Carbonate Sedimentary Rocks . With its comprehensive coverage, stunning illustrations, and rigorous scientific approach, this textbook delivers the that serious study demands. Whether you are investigating petroleum reservoirs, reconstructing paleoclimates, or simply marveling at the natural history written in limestone cliffs, a thorough understanding of carbonate origin is your essential foundation.
Carbonate sedimentary rocks are not just “limey sandstones.” They are of ancient climate, ocean chemistry, and evolutionary innovation. Every limestone or dolomite bed records a specific latitude, temperature, and biological community. To read a carbonate rock is to read the biogeochemical diary of a vanished sea .