formation de dolomite

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Modern dolomite formation caused by seasonal cycling of
2021年2月18日 1 Altmetric Metrics Abstract The “Dolomite Problem” has been a controversy for over a century, owing to massive assemblages of low-temperature
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Dolomitization process and its implications for
2015年7月1日 Since classic theory, molecular replacement of limestone by dolomite was proposed by Elie de Beaumont in 1837, the origin of porosity in dolostone has received
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Thermodynamic analysis of theoretical dolomite formation from seawater ...
2019年9月24日 The results show that formation of dolomite is favorable at temperature ranges of 313–470 K based on the thermodynamic study. The exergy efficiency of
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Low-Temperature Synthesis of Disordered
2021年12月17日 Challenges to synthesizing dolomite at low temperatures have hindered our understanding of sedimentary dolomite formation. Unlike calcium, magnesium’s high affinity toward water results in kinetic barriers
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Origin and diagenetic evolution of dolomites in
2022年12月1日 The origin of dolomite in Shahejie Formation shale of Jiyang Depression in eastern China were studied by means of petrologic identification, compositional analysis
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Formation of Dolomite Composition - Compare Nature
Formation of Dolomite is explained below: Dolomite rocks are originally deposited as calcite or aragonite rich limestone, but during diagenesis process, the calcite or aragonite is
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Dolomie_formation Falaises de craie - CRIANN
La formation de la dolomie. La craie subit un phénomène de dolomitisation, c’est-à-dire la substitution partielle de l’aragonite par la dolomite (CaMg (CO3)2). Une telle transformation est due à la percolation de saumures
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Formation de Dolomie - Compare Nature
1.1 Formation. roches dolomitiques sont initialement déposés sous forme de calcite ou de calcaire riche aragonite, mais au cours du processus de diagenèse, la calcite ou
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Effects of sodium and potassium concentrations on dolomite formation ...
2023年7月12日 The decrease in dolomite cation ordering at higher Na concentrations may stem from the incorporation of Na into dolomite which strains the crystal lattice and
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Dolomite - Propriétés, Utilisation et Effets
2021年3月17日 Effets secondaires. Une supplémentation en dolomite peut provoquer des éructations, des flatulences, des nausées, des malaises gastro-intestinaux, de la constipation, des crampes abdominales, des
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Low-Temperature Synthesis of Disordered
2021年12月17日 How dolomite [CaMg(CO3)2] forms is still underdetermined, despite over a century of efforts. Challenges to synthesizing dolomite at low temperatures have hindered our
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Flow, dissolution, and precipitation in dolomite - Singurindy
2003年6月6日 [9] Sucrosic dolomite (98.5% CaMg(CO 3) 2, over 1.5% CaCO 3) was identified for laboratory study from the Amminadav formation, Jerusalem, Israel.Analysis of rock mineralogical composition was made by X-ray powder diffraction. CaCl 2 /HCl mixtures acted as the reacting fluid in the sucrosic dolomite porous media. The effect of dolomite
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Dolomite - an overview ScienceDirect Topics
H.G. Machel, in Encyclopedia of Geology, 2005 Introduction. Dolomite was first described in 1791 as a rock by Deodat de Dolomieu, who investigated samples from the Italian Alps. Dolomites are of special interest because they often form hydrocarbon reservoir rocks. Despite intensive research for more than 200 years, the origin of dolomites is subject to
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Dolomite - Properties, Composition, Distribution and Formation
2023年7月15日 Formation of Dolomite. Modern dolomite formation has been discovered in supersaturated saline lagoons along the Rio de Janeiro coast of Brazil, including Lagoa Vermelha and Brejo do Espinho, under anaerobic conditions. Many people believe that dolomite can only form with the aid of sulfate-reducing bacteria e.g. Desulfovibrio
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Thermodynamic analysis of theoretical dolomite formation from seawater ...
2019年9月24日 The exergy efficiency of dolomite formation is found to be about 23.8% and the results reveal that the dolomite formation process has the specific exergy destruction value of 29.6 kJ/mol among other sub-processes. ... Kjellsen KO, Geiker MR, De Weerdt K (2018) Chloride-binding capacity of hydrotalcite in cement pastes containing dolomite and ...
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Dolomite - an overview ScienceDirect Topics
Dolomite was the first fertilizer used to prevent hypomagnesemia (Cunningham, 1936).When applied at rates between 100 and 540 kg Mg/ha the Mg concentration of temperate forage is increased by 0.2–1.2 g/kg DM (Table 9.13).These increases in Mg concentration in the forage were associated with a rise in the level of exchangeable Mg in the soil (Jones,
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(PDF) Dolomitization process and its implications for porosity ...
2015年4月20日 dolomite was proposed by Elie de Beaumont in 1837, the origin of porosity in dolostone has received considerable attention and several theories have been advanced ( Landes, 1946; Weyl, 1 960;
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Modern dolomite formation caused by seasonal cycling of
2021年2月18日 Dolomite formation in the quaternary has also been linked to changes in water and redox chemistry that led to elevated cell mortality and organic matter ... (Lagoa Vermelha, Rio de Janeiro, Brazil
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dolomite Formation, structure, propriétés, utilisations et
2020年11月9日 Ainsi, lexplication de la formation de dolomite dans ces unités marines reste en question. On pense maintenant que les dolomies peuvent être dorigines diverses. En effet, plusieurs modèles différents ont été proposés pour la formation de dolomite, chacun basé sur des considérations diverses, combinées à des données empiriques et ...
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Petrologic and geochemical attributes of calcite cementation ...
2017年6月1日 Les carbonates de la Formation de Pekisko représentent un important gisement dans le Centre-Ouest de l’Alberta, surtout dans les champs le long de la bordure subaffleurante de Pekisko. ... Selon les analyses pétrographiques et géochimiques, on a identifié cinq types de dolomite dans la Formation de Pekisko: 1) dolomite
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(PDF) CARACTÉRISATION LITHOSTRATIGRAPHIQUE ET PÉTROGRAPHIQUE DES ...
2019年10月18日 caractÉrisation lithostratigraphique et pÉtrographique des formations sÉdimentaires de la vallÉe de walidiala (senegal oriental)
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The Dolomite Problem: A Matter of Time ACS Earth and
2022年6月3日 Dolomite, CaMg(CO 3) 2, is an abundant carbonate mineral in ancient rock formations, but it is extremely scarce in modern sedimentary environments.This intriguing observation has been repeatedly referred to as the “dolomite problem” in the geological literature. Many geoscientists over time have almost obsessively searched for a solution
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Formation of fine crystalline dolomites in lacustrine
2016年11月7日 The genesis of the fine crystalline dolomites that exhibit good to excellent reservoir properties in the upper fourth member of the Eocene Shahejie Formation (Es 4 s ) around the Sikou Sag, Bohai Bay Basin, is uncertain. This paper investigates the formation mechanisms of this fine crystalline dolomite using XRD, SEM, thin section analysis and
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Microbialites of terminal Ediacaran in the Upper
2022年1月1日 Here we focus on microbialites from Yangba section of the Z 2 dn 2 member, located in Yangba, Nanjiang County, Sichuan Province (32°28′7″ N, 106°46′58″ E; Fig. 1 A). The stratigraphic thickness of each member of the Dengying Formation in the Yangba Section is shown in Fig. 1 B. The Z 2 dn 2 member was deposited in a
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Hydrothermal dolomitization and porosity development: An
2019年10月1日 Dolomite veins have NW-SE direction, commonly associated with cavity formation, and at a macroscopic scale, their brown color distinguish them from calcite (Fig. 3 E); cross-cutting relationship between veins and filled cavities denote two phases of calcite veins interleaved with a dolomite phase. In some veins, the calcite is coarse-grained ...
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Dolomite : produit contenant de la dolomite - Pharmashopi
Formation de la roche dolomite. La formation de la roche dolomite a débuté par l’accumulation des coquillages, des coraux et des algues calcaires dans les zones marines ou tropicales. Il y a des millions d’années de cela, ces roches étaient des massifs de corail. À cause de la tectonique des plaques et de l’entassement des sédiments ...
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A route for the direct crystallization of dolomite† American ...
2015年5月1日 This occurs via the dissolution of Mg-ACC, followed by the secondary nucleation of proto-dolomite from solution. The proto-dolomite crystallization proceeds via spherulitic growth that follows a growth front nucleation mechanism with a de-nuovo and continuous formation of nanocrystalline proto-dolomite subunits that form spherical
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Massive formation of early diagenetic dolomite in the
2022年2月28日 organogenic dolomite model is supported by both laboratory culture experiments and some modern field observations (10, 11, 13–15). These early diagenetic models are undoubtedly relevant to understanding massive dolostone formation in deep time (e.g., ref. 17); however, only minor amounts of dolomite are formed in
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