: Orthorhombic structure. It is metastable at surface conditions and highly susceptible to diagenetic alteration. Low-Mg Calcite (LMC) : Contains less than 4% MgCO3cap M g cap C cap O sub 3 . It is the most stable form under ambient conditions. High-Mg Calcite (HMC) : Contains more than 4% MgCO3cap M g cap C cap O sub 3
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Deep-sea carbonates are dominated by pelagic settling. However, their accumulation is strictly limited by the . The CCD is the bathymetric threshold where the rate of calcium carbonate dissolution matches the rate of supply. Below this depth, cold, highly pressurized waters enriched in CO2CO sub 2
Found in latitudes >30°, where waters are cooler and often undersaturated with respect to aragonite. origin of carbonate sedimentary rocks pdf extra quality
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degassing, prompting immediate calcium carbonate precipitation.
The upper boundary where dissolution begins to accelerate due to low temperatures, high hydrostatic pressure, and elevated dissolved CO2CO sub 2 : Orthorhombic structure
The Genesis of Carbonate Sedimentary Rocks: From Biogenic Precipitation to Lithification Author: [Your Name/AI Assistant] Date: October 26, 2023 Subject: Sedimentary Geology / Geochemistry
Coccolithophores (algae) and planktonic foraminifera secrete LMC tests, forming the primary engine for deep-sea pelagic ooze accumulation since the Jurassic. Biophysically Mediated Precipitation
Petrologists rely on two primary classification schemes to decipher the depositional energy and origin of carbonate components. Dunham Classification System (1962) It is the most stable form under ambient conditions
| Topic | Source | Key Content | | :--- | :--- | :--- | | | Semantic Scholar | Investigates the debated origin of fine-grained carbonate mud, crucial for understanding ancient carbonate sequences. | | Sedimentology and Geochemistry of Dolostones | Semantic Scholar | Addresses the long-standing "dolomite problem" and the origin of this enigmatic mineral. | | Origin of Primary and Diagenetic Carbonates (Eocene Green River Formation) | USGS Publications Warehouse | A classic USGS study on lacustrine carbonates, providing a high-quality, free PDF case study. | | Quantitative Diagenesis of Carbonate Reservoir Rocks | Imperial College London (Spiral) | A modern paper (2022) detailing quantitative methods to study diagenesis and its effect on porosity, offering cutting-edge methodology. | | Computer Modeling of Carbonate Platforms | Kansas Geological Survey | A resource for understanding the large-scale modeling of carbonate platform depositional systems. |
The precipitation of primary dolomite at surface temperatures is restricted by a severe kinetic barrier: the high hydration energy of the Mg2+Mg raised to the 2 plus power
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