Crystal Chemistry of Sedimentary Carbonate Minerals

Lippmann, F.

doi:10.1007/978-3-642-65474-9_2

Cited by 66 publications

(86 citation statements)

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“…3A). All other reflections were absent [except for the (104) reflection, which was relatively weak compared to randomly oriented cal- ments yielded a 17" + 1" inclination between the film normal and the (014) face, which confirms the assignment of the (012) basal plane, on the basis of the known suucture of calcite (25). The crystal's a axis [long direction of the (014) face] was perpendicular to the projected symmetry axis (c') and parallel to the polymer backbone direction (Fig.…”

supporting

confidence: 65%

Total Alignment of Calcite at Acidic Polydiacetylene Films: Cooperativity at the Organic-Inorganic Interface

Berman

Ahn

Lio

et al. 1995

Science

253

237

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Biological matrices can direct the absolute alignment of inorganic crystals such as calcite. Cooperative effects at an organic-inorganic interface resulted in similar co-alignment of calcite at polymeric Langmuir-Schaefer films of 10,12-pentacosadiynoic acid (p-PDA). The films nucleated calcite at the (012) face, and the crystals were co-aligned with respect to the polymer's conjugated backbone. At the same time, the p-PDA alkyl side chains reorganized to optimize the stereochemical fit to the calcite structure, as visualized by changes in the optical spectrum of the polymer. These results indicate the kinds of interactions that may occur in biological systems where large arrays of crystals are co-aligned.

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supporting

confidence: 65%

Total Alignment of Calcite at Acidic Polydiacetylene Films: Cooperativity at the Organic-Inorganic Interface

Berman

Ahn

Lio

et al. 1995

Science

253

237

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“…However, further analysis is necessary to better understand the effect of minerology, specific stoichiometry, and crystallinity on the reactive transport of U and V from these mine wastes. The coexistence of crystalline and amorphous U–V bearing minerals in unreacted mine waste samples can be a result of nucleation 51, 52 or polymorphism, 53 which are common in natural samples, due to their heterogeneity in site and reactivity conditions. These results agree with observations made in other studies that have shown that crystallinity can affect the solubility of mineral phases.…”

Section: Resultsmentioning

confidence: 99%

Reactive Transport of U and V from Abandoned Uranium Mine Wastes

Avasarala¹,

Lichtner

Ali³

et al. 2017

Environ. Sci. Technol.

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The reactive transport of uranium (U) and vanadium(V) from abandoned mine wastes collected from the Blue Gap/Tachee Claim-28 mine site in Arizona was investigated by integrating flow-through column experiments with reactive transport modeling, and electron microscopy. The mine wastes were sequentially reacted in flow-through columns at pH 7.9 (10 mM HCO3−) and pH 3.4 (10 mM CH3COOH) to evaluate the effect of environmentally relevant conditions encountered at Blue Gap/Tachee on the release of U and V. The reaction rate constants (km) for the dissolution of uranyl–vanadate (U–V) minerals predominant at Blue Gap/Tachee were obtained from simulations with the reactive transport software, PFLOTRAN. The estimated reaction rate constants were within 1 order of magnitude for pH 7.9 (km = 4.8 × 10−13 mol cm−2 s−1) and pH 3.4 (km = 3.2 × 10−13 mol cm−2 s−1). However, the estimated equilibrium constants (Keq) for U–V bearing minerals were more than 6 orders of magnitude different for reaction at circumneutral pH (Keq = 10−38.65) compared to acidic pH (Keq = 10−44.81). These results coupled with electron microscopy data suggest that the release of U and V is affected by water pH and the crystalline structure of U–V bearing minerals. The findings from this investigation have important implications for risk exposure assessment, remediation, and resource recovery of U and V in locations where U–V-bearing minerals are abundant.

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“…Early models of dolomite formation focused on physiochemical processes (Lippmann, 1973;Baker and Kastner, 1981;Lumsden et al, 1995;Brady et al, 1996), while more recent research has emphasized the role of microbial processes in the mineralization process (Sánchez-Román et al, 2008;Sadooni et al, 2010;Bontognali et al, 2012Bontognali et al, , 2014aBrauchli et al, 2016). Earlier models of microbial involvement discussed the role of sulfate reducing bacteria in dolomite formation by increasing pH and alkalinity and removing sulfate (Vasconcelos et al, 1995;Vasconcelos and McKenzie, 1997;Wright, 1999).…”

Section: Introductionmentioning

confidence: 99%

Evidence of a Role for Aerobic Bacteria in High Magnesium Carbonate Formation in the Evaporitic Environment of Dohat Faishakh Sabkha in Qatar

Disi

Jaoua

Bontognali

et al. 2017

Front. Environ. Sci.

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Dolomite (MgCa(CO 3 ) 2 ) is an important petroleum reservoir rock mineral common in ancient sedimentary rocks which is infrequently found in modern environments. The mechanism of dolomite formation remains poorly understood, although recent research has focused on the contribution of microbial processes. Sabkha is the Arabic term for saline mudflats occurring in regions characterized by extreme environmental conditions (high temperature, salinity, light intensity, and aridity), where diverse halophilic and extremophilic microorganisms are found. The dynamic evaporitic systems characteristic of sabkhas are crucial for the precipitation of minerals and a role for microorganisms in sabkhas in the process of mineralization has been proposed. In this study the Dohat Faishakh Sabkha in Qatar was investigated for evidence of the role for aerobic bacteria in mediating the formation of high magnesium carbonates and dolomite, two minerals that commonly occur in the sabkha sediments. Twenty-nine strains of aerobic microbes were obtained through inoculation on agar plates from two different cores sampled from the sabkha and identified by 16S rRNA gene sequencing as belonging to the genera Bacillus, Salinivibrio, Staphylococcus and, primarily, Virgibacillus. All strains examined caused the pH of an artificial growth medium to increase from 7 to 8.5; however, not all were capable of mediating mineral formation. Only Salinivibrio and Virgibacillus spp. isolates mediated the formation of detectable solid phases within the agar plates. Light microscopy, scanning electron microscopy energy dispersive X-ray (SEM/EDX), and X-ray diffraction (XRD) analyses indicate that the solid phase produced in the presence of these bacterial strains is MgCa(CO 3 ) 2 with a MgCO 3 mol% varying from 0 to 40%. The results of these laboratory experiments suggested that, in the Dohat Faishakh Sabkha, aerobic bacteria may contribute in the formation of very high Mg calcite, a mineral that is considered the precursor of ordered dolomite.

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Crystal Chemistry of Sedimentary Carbonate Minerals

Cited by 66 publications

References 0 publications

Total Alignment of Calcite at Acidic Polydiacetylene Films: Cooperativity at the Organic-Inorganic Interface

Total Alignment of Calcite at Acidic Polydiacetylene Films: Cooperativity at the Organic-Inorganic Interface

Reactive Transport of U and V from Abandoned Uranium Mine Wastes

Evidence of a Role for Aerobic Bacteria in High Magnesium Carbonate Formation in the Evaporitic Environment of Dohat Faishakh Sabkha in Qatar

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