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) rarely precipitates in modern marine environments. This disparity is known as the "Dolomite Problem."
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Spheroidal grains composed of microcrystalline carbonate, lacking internal structure, often originating as fecal pellets.
The "dolomite problem" is largely resolved. Most ancient dolomite is microbially mediated in cool, anoxic pore waters, not hot brines. origin of carbonate sedimentary rocks pdf new
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ions, allowing rapid dolomitization along fault pathways and fracture networks. This model is critical for creating deep reservoir porosity in oil, gas, and geothermal systems. 5. Carbonate Sedimentary Records as Deep-Time Archives
The PDF argues that . There is no sharp line between a sediment and a rock. Key processes:
Understanding origin directly impacts exploration: You can access the official PDF directly from
Hardie, L.A., Grotzinger, J.P., & Bosak, T. (2025). Origin of Carbonate Sedimentary Rocks: New Perspectives from Geomicrobiology and Isotope Geochemistry (2nd ed.) [PDF]. SEPM Carbonate Research Group. https://doi.org/10.2110/carb.2025.origin.new
The story of carbonate rocks begins with the . This process forms the fundamental building blocks of all carbonate sediments. The primary engine driving this precipitation in marine settings is the "carbonate factory," a concept that integrates biological, chemical, and physical processes. This factory is most active in the warm, clear, shallow waters of tropical and subtropical regions, which is why carbonate platforms are largely confined to the latitudes between 30° N and 30° S.
) during carbon fixation. This localized consumption elevates pH and increases the concentration of CO32−CO sub 3 raised to the 2 minus power Anaerobic bacteria utilizing SO42−SO sub 4 raised to the 2 minus power as an electron acceptor generate alkalinity ( HCO3−HCO sub 3 raised to the negative power ) and hydrogen sulfide (
Origin of Carbonate Sedimentary Rocks Carbonate sedimentary rocks constitute approximately 20% of the Phanerozoic sedimentary record. These rocks serve as primary archives for ancient ocean chemistry, global climate transitions, and major evolutionary events. They also form high-porosity reservoirs that contain a significant portion of the world's hydrocarbon and groundwater resources. Understanding their origin requires an evaluation of biological precipitation, ambient water chemistry, and post-depositional alteration. 1. Major Components and Mineralogy Most ancient dolomite is microbially mediated in cool,
Characterized by marine pore waters. Isopachous fibrous or acicular aragonite and HMC cements precipitate within primary pore spaces, stabilizing the framework without compaction.
Ca2++2HCO3−⇌CaCO3↓+CO2↑+H2OCa raised to the 2 plus power plus 2 HCO sub 3 raised to the negative power is in equilibrium with CaCO sub 3 down arrow positive CO sub 2 up arrow positive H sub 2 O
A major "new" concept: Carbonate precipitation mechanisms have changed over geological time due to ocean chemistry and biology.