Crystal chemistry, and thermodynamic and kinetic properties of calcite, dolomite, apatite, and biogenic silica: applications to petrologic problems

Tribble, Jane S.; Arvidson, Rolf S.; Lane, Michael; Mackenzie, Fred T.

doi:10.1016/0037-0738(94)00094-b

Cited by 82 publications

(60 citation statements)

References 64 publications

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“…The tendency toward Mg 2+ -rich termination for dolomite in an undersaturated environment, discussed in the introduction from work by Pokrovsky and Schott (2001) and Tribble et al (1995), was also observed by El-Mofty et al (1989). They found that at low solid-to-liquid ratios and for short time intervals, which is equivalent to the dolomite dissolution studies in this paper, preferential dissolution of Ca occurred leading to a Mg-enriched dolomite surface.…”

Section: Surface Mg Enrichment In Undersaturated Solutionsupporting

confidence: 58%

“…In undersaturated solution however, more recent work by Pokrovsky and Schott (2001) indicated the tendency for Ca 2+ to be released from the mineral surface approximately 10% faster than Mg 2+ at pH = 9 within the first few hours of the reaction in a mixed-flow reactor. In batch reactor studies, the same preferential release of Ca 2+ was observed in the first 100 h of reaction at 60°C in undersaturated, slightly alkaline aqueous solution (Tribble et al, 1995). Although stoichiometric dissolution obtains in the long-term as shown in Pokrovsky and Schott (2001), the initial imbalance implies a persistence of non-stoichiometric composition at the surface if bulk diffusion through the solid state is negligible.…”

Section: Introductionmentioning

confidence: 56%

“…Epitaxial growth, or layer-by-layer growth, at the mineral-water interface has been demonstrated on various systems including homoepitaxial growth of calcite, barite, and celestite under supersaturated solutions (e.g., Higgins et al, 2000;Teng et al, 2000;Risthaus et al, 2001). However, dolomite does not form under similar low-temperature/low-pressure conditions (De Boer, 1977;Deelman, 1981;Hartman, 1982;Reeder, 1982;El-Mofty et al, 1989;Tribble et al, 1995;Brady et al, 1996;Arvidson and Mackenzie, 1997;Pokrovsky, 1998;Titiloye et al, 1998;De Leeuw, 2002) nor has epitaxial growth been observed in recent attempts on dolomite seed crystals . The surface Ca/Mg ratio variability on dolomite surfaces may have implications in the tendency for formation (from supersaturated solution) of non-dolomite phases such as magnesian calcite, aragonite, and various carbonate hydrates (Pokrovsky, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…A review of the formation of dolomite in laboratory experiments was provided by Tribble et al (1995) and only a summary is provided herein. Most synthetic experiments yielded ordered dolomite from reaction of calcite (Lumsden et al, 1989;Sibley, 1990) and/or aragonite (Gaines, 1974;Katz and Matthews, 1977) under hydrothermal conditions.…”

Section: Introductionmentioning

confidence: 99%

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X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

Joshi

Mukhopadhyay

et al. 2006

Geochimica et Cosmochimica Acta

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Cleaved surfaces of dolomite were studied using ex-situ X-ray photoelectron spectroscopy (XPS) following exposure of the surfaces to various experimental conditions. Dolomite samples exposed to air, to a highly undersaturated solution (0.1 M NaCl, pH = 9), and to solution with a supersaturation (ÀDl/kT) of 5.5 (pH = 9) were investigated with semiquantitative methods of analysis to ascertain the degree of non-stoichiometry resulting at the dolomite surface from reactive conditions. It was found that the dolomite cleavage surface in undersaturated solution was not altered significantly from the stoichiometric surface termination. The composition of the cleaved surface after exposure to supersaturated solution, a surface known to have self-limiting growth characteristics under similar conditions, was found to be Ca 2+ rich (Ca x Mg 2 À x (CO 3 ) 2 , 1.7 > x > 1.3). The observations, while underscoring differences in hydration/dehydration kinetics of the two alkaline earth cations, suggest that achievement of equilibrium at dolomite-water interfaces may be subject to significant barriers from both undersaturated and supersaturated solutions.

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Section: Surface Mg Enrichment In Undersaturated Solutionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

Joshi

Mukhopadhyay

et al. 2006

Geochimica et Cosmochimica Acta

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“…The formation of inorganic apatite by chemical precipitation and recrystallization processes has been subject of extensive research during past decades (e.g. Bentor, 1980;Sheldon, 1981;Tribble et al, 1995). Earlier research focused on the formation of carbonate fluorapatite (CFAP) bearing phosphorite deposits, which are referred to as such if they contain more than 5 wt% P 2 O 5 (Ruttenberg and Berner, 1993).…”

Section: Introductionmentioning

confidence: 99%

Quantification of octacalcium phosphate, authigenic apatite and detrital apatite in coastal sediments using differential dissolution and standard addition

Oxmann

Schwendenmann

2014

Ocean Sci.

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Abstract. Knowledge of calcium phosphate (Ca-P) solubility is crucial for understanding temporal and spatial variations of phosphorus (P) concentrations in water bodies and sedimentary reservoirs. In situ relationships between liquid-and solid-phase levels cannot be fully explained by dissolved analytes alone and need to be verified by determining particular sediment P species. Lack of quantification methods for these species limits the knowledge of the P cycle. To address this issue, we (i) optimized a specifically developed conversion-extraction (CONVEX) method for P species quantification using standard additions, and (ii) simultaneously determined solubilities of Ca-P standards by measuring their pH-dependent contents in the sediment matrix. Ca-P minerals including various carbonate fluorapatite (CFAP) specimens from different localities, fluorapatite (FAP), fish bone apatite, synthetic hydroxylapatite (HAP) and octacalcium phosphate (OCP) were characterized by XRD, Raman, FTIR and elemental analysis. Sediment samples were incubated with and without these reference minerals and then sequentially extracted to quantify Ca-P species by their differential dissolution at pH values between 3 and 8. The quantification of solid-phase phosphates at varying pH revealed solubilities in the following order: OCP > HAP > CFAP (4.5 % CO 3 ) > CFAP (3.4 % CO 3 ) > CFAP (2.2 % CO 3 ) > FAP. Thus, CFAP was less soluble in sediment than HAP, and CFAP solubility increased with carbonate content. Unspiked sediment analyses together with standard addition analyses indicated consistent differential dissolution of natural sediment species vs. added reference species and therefore verified the applicability of the CONVEX method in separately determining the most prevalent Ca-P minerals. We found surprisingly high OCP contents in the coastal sediments analyzed, which supports the hypothesis of apatite formation by an OCP precursor mechanism.

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Benthic marine calcifiers coexist with CaCO₃‐undersaturated seawater worldwide

Lebrato

Andersson

Ries

et al. 2016

Global Biogeochemical Cycles

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Ocean acidification and decreasing seawater saturation state with respect to calcium carbonate (CaCO 3 ) minerals have raised concerns about the consequences to marine organisms that build CaCO 3 structures. A large proportion of benthic marine calcifiers incorporate Mg 2+ into their skeletons (Mg-calcite), which, in general, reduces mineral stability. The relative vulnerability of some marine calcifiers to ocean acidification appears linked to the relative solubility of their shell or skeletal mineralogy, although some organisms have sophisticated mechanisms for constructing and maintaining their CaCO 3 structures causing deviation from this dependence. Nevertheless, few studies consider seawater saturation state with respect to the actual Mg-calcite mineralogy (Ω Mg-x ) of a species when evaluating the effect of ocean acidification on that species. Here, a global dataset of skeletal mole % MgCO 3 of benthic calcifiers and in situ environmental conditions spanning a depth range of 0 m (subtidal/neritic) to 5600 m (abyssal) was assembled to calculate in situ Ω Mg-x . This analysis shows that 24% of the studied benthic calcifiers currently experience seawater mineral undersaturation (Ω Mg-x < 1). As a result of ongoing anthropogenic ocean acidification over the next 200 to 3000 years, the predicted decrease in seawater mineral saturation will expose approximately 57% of all studied benthic calcifying species to seawater undersaturation. These observations reveal a surprisingly high proportion of benthic marine calcifiers exposed to seawater that is undersaturated with respect to their skeletal mineralogy, underscoring the importance of using species-specific seawater mineral saturation states when investigating the impact of CO 2 -induced ocean acidification on benthic marine calcification.

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Crystal chemistry, and thermodynamic and kinetic properties of calcite, dolomite, apatite, and biogenic silica: applications to petrologic problems

Cited by 82 publications

References 64 publications

X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

Quantification of octacalcium phosphate, authigenic apatite and detrital apatite in coastal sediments using differential dissolution and standard addition

Benthic marine calcifiers coexist with CaCO₃‐undersaturated seawater worldwide

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Crystal chemistry, and thermodynamic and kinetic properties of calcite, dolomite, apatite, and biogenic silica: applications to petrologic problems

Cited by 82 publications

References 64 publications

X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

Quantification of octacalcium phosphate, authigenic apatite and detrital apatite in coastal sediments using differential dissolution and standard addition

Benthic marine calcifiers coexist with CaCO3‐undersaturated seawater worldwide

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Benthic marine calcifiers coexist with CaCO₃‐undersaturated seawater worldwide