Geochemistry of Sedimentary Carbonates by J.W. Morse, F.T. Mackenzie

By J.W. Morse, F.T. Mackenzie

This publication covers the extra uncomplicated features of carbonate minerals and their interplay with aqueous recommendations; glossy marine carbonate formation and sediments; carbonate diagenesis (early marine, meteoric and burial); the worldwide cycle of carbon and human intervention; and the function of sedimentary carbonates as signs of balance and alterations within the Earth's floor setting. the chosen matters are provided with adequate historical past info to permit the non-specialist to appreciate the elemental chemistry concerned. confirmed on periods taught by way of the authors, and authorized by means of the scholars, this complete quantity will end up itself to be a important reference resource to scholars, researchers and pros within the fields of oceanography, geochemistry, petrology, environmental technology and petroleum geology.

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That is why "apparent" and stoichiometric equilibrium constants, which do not involve the use of activity coefficients, have been in widespread use in the study of marine carbonate chemistry for over 20 years. The stoichiometric constants, usually designated as K*, involve only the use of concentrations, whereas expressions for apparent equilibrium constants contain both concentrations and aH+ derived from "apparent pH". These constants are usually designated as K'. Examples of these different types of constants are: Stoichiometric constant.

The solid carbonate can also present several potential difficulties in solubility studies. These can be broken down into two major areas: heterogeneity in composition, and excess free energy associated with lattice strain or defects and surface free energy. The problem of solid heterogeneity presents itself in most sedimentary carbonates, and is especially important in biogenic carbonates such as magnesian calcites.

See Albright, 1971, for summary). However, it can be produced in the laboratory under experimental conditions that give rise to high precipitation rates of carbonate phases. , Albright, 1971; Turnbull, 1973) over metastable phase relations, it is clear that vaterite is always a metastable phase under the environmental conditions found in sediments and sedimentary rocks. Hydrated CaC03 minerals also are found occasionally in sediments. , 1982). Its formation is favored by sub-zero temperatures i n interstitial waters where active microbial decomposition of organic matter is taking place.

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