Towards a morphology diagram for terrestrial carbonates: Evaluating the impact of carbonate supersaturation and alginic acid in calcite precipitate morphology

Mercedes‐Martín, Ramon; Rogerson, Mike; Prior, Timothy J.; Brasier, Alexander T.; Reijmer, John J.G.; Billing, Ian; Matthews, Anna; Love, Tracy; Lepley, Scott; Pedley, Martyn

doi:10.1016/j.gca.2021.04.010

Cited by 16 publications

(10 citation statements)

References 85 publications

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“…In parallel, the calcite forms aggregates of rhombohedral-to-scalenohedral crystals, sometimes surrounding detrital grains (Figure 7g). As experimentally showed by [69], the difference in calcite texture may reflect different modes of precipitation (Figure 7g). Indeed, the pond water is located below the solubility lines of ACCs, suggesting that the a(Ca 2+ )/a(CO 3 2− ) of water is not controlled by the precipitation of ACC but possibly by the formation of a less-hydrated crystalline carbonate phase (Figure 4).…”

Section: Calcite Precipitation In Hypersaline Saturated Watersmentioning

confidence: 59%

“…Therefore, the a(Ca 2+ )/a(CO 3 2− ) of pond water, which is located between the solubility lines of the monohydrocalcite and calcite, may reflect the transformation of ACC to a more crystalline phase. The precipitation of branching rhombohedric calcite is probably abiotic, as suggested by [69] and promoted in these ponds by the high level of evaporation (up to 89%) and associated CO 2 salting-out.…”

Section: Calcite Precipitation In Hypersaline Saturated Watersmentioning

confidence: 74%

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Successive Modes of Carbonate Precipitation in Microbialites along the Hydrothermal Spring of La Salsa in Laguna Pastos Grandes (Bolivian Altiplano)

et al. 2022

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Interpreting the paleoecosystems of ancient microbialites relies on our understanding of how modern microbialites form in relation with the bio-physico-chemical conditions of their environment. In this study, we investigated the formation of modern carbonate microbialites in the hydrothermal system of La Salsa in Laguna Pastos Grandes (Bolivia), which spans a wide range of physicochemical conditions and associated microbial communities. By combining dissolved inorganic carbon (DIC) isotope mass balance modeling, analysis of carbonates solubility diagram, and imaging of the microorganisms–mineral assemblages within microbial mats, we found that several modes of carbonate precipitation dominate in distinct portions of the hydrothermal system. (1) In high-[DIC] waters, undersaturated to slightly saturated with respect to calcite, cyanobacterial calcification is promoted by CO2 degassing and photosynthetic activity within the microbial mats. (2) In alkaline waters undergoing sustained evaporation, the precipitation of an amorphous calcium carbonate phase seems to control the water a(Ca2+)/a(CO32−) ratio and to serve as a precursor to micritic calcite formation in microbial mats. (3) In saline ephemeral ponds, where the carbonate precipitation is the highest, calcite precipitation probably occurs through a different pathway, leading to a different calcite texture, i.e., aggregates of rhombohedral crystals.

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Section: Calcite Precipitation In Hypersaline Saturated Watersmentioning

confidence: 59%

Section: Calcite Precipitation In Hypersaline Saturated Watersmentioning

confidence: 74%

Successive Modes of Carbonate Precipitation in Microbialites along the Hydrothermal Spring of La Salsa in Laguna Pastos Grandes (Bolivian Altiplano)

et al. 2022

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“…The terminology used for petrographic descriptions follows the nomenclature of Pedley (1992), Jones et al (2005) and Flügel (2013). The definitions of Mercedes‐Martín et al (2021b) for single crystals and polycrystals are also employed in this study. A single crystal corresponds to a solid object with only one grain or crystal and hence, no grain boundaries in which an orderly three‐dimensional arrangement of the atoms, ions or molecules is repeated throughout the entire volume (Jones et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…Differentiating the influences exerted by abiotic processes and biologically influenced mechanisms in the formation and early diagenesis of non‐skeletal carbonates still remains problematic (Brasier et al, 2015; Capezzuoli et al, 2014; Fouke, 2011; Wright, 2012), and non‐skeletal carbonates show a wide range of petrographic fabrics due to interactions between physicochemical and biologically influenced mechanisms (Arp et al, 2010; Mercedes‐Martín et al, 2021a, 2021b). However, these studies provide great insight into what deviation from thermodynamic equilibrium processes might be expected to experience within hyperalkaline leachate sites and provide a foundation for their investigation.…”

Section: Introductionmentioning

confidence: 99%

What are the different styles of calcite precipitation within a hyperalkaline leachate? A sedimentological Anthropocene case study

Bastianini

Rogerson

Mercedes‐Martín

et al. 2021

The Depositional Record

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Anthropogenic carbonates are pyrotechnological products composed of calcium carbonate, and include wood ash, lime plaster/mortar and hydraulic mortar, in addition to secondary carbonates that arise as a product of weathering a range of globally important industrial residues (Toffolo, 2020). These residues include steel slags (Roadcap et al., 2005), coal combustion residues (Dellantonio et al., 2010), chromite ore processing waste (Stewart et al.

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“…Although all of the abiotic and biotic processes described here are considered to play a role in travertine deposition, evaluation of their contributions is difficult (e.g. Mercedes‐Martín et al ., 2021). With regard to the abiotic process, precipitation rate is usually described as a function of bulk water chemistry (e.g.…”

Section: Introductionmentioning

confidence: 99%

Abiotic and biotic processes controlling travertine deposition: Insights from eight hot springs in Japan

et al. 2021

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Contributions of abiotic and biotic processes on travertine deposition are still not well‐understood due to technical difficulties, despite that the travertines draw attention as analogues for ancient microbial carbonates and oil reservoirs. To evaluate their contributions, this study examined eight hot springs in Japan. Water chemistry analyses showed common downstream trends: a decrease in CO2 concentration and increases in CO32− concentration and pH. Mineralogical analysis showed that the constituent minerals of travertines at six hot springs were both calcite and aragonite, while one was just calcite and another only aragonite. Microscopic observations of travertine surfaces indicated the dominance of cyanobacteria secreting extracellular polymeric substances without a detectable amount of carboxyl groups. Small particles were sometimes entangled/covered by these cyanobacteria. Microelectrode measurements showed the occurrence of abiotic CaCO3 precipitation and photosynthetic induction/inhibition of CaCO3 precipitation, the extent of which was different at each site. By integrating these results, the contributions of abiotic and biotic processes were evaluated. Cyanobacteria inhabiting travertine surfaces were generally not calcified regardless of an ambient high CaCO3 saturation state; instead, they contributed to creating pore spaces and trap/bind suspended particles. Downstream CO2 degassing increased the CaCO3 saturation state by shifting carbonate chemical equilibrium and caused abiotic CaCO3 precipitation. Suspended particles trapped by cyanobacteria increased the surface area for crystal growth to further accelerate precipitation. The contribution of photosynthesis‐induced CaCO3 precipitation was low because of several factors, including variable cyanobacteria populations and photosynthetic inhibition of CaCO3 precipitation. The average contributions of photosynthesis‐induced CaCO3 precipitation, Ca2+ adsorption and abiotic precipitation in the eight hot springs were 16%, 3% and 81%, respectively, indicating predominance of the abiotic process for travertine deposition. Mineralogical composition of travertines significantly correlated with concentrations of SO42− and Mg2+, much more than with Mg/Ca ratio and water temperature, suggesting their importance for controlling CaCO3 polymorphs in travertines.

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Towards a morphology diagram for terrestrial carbonates: Evaluating the impact of carbonate supersaturation and alginic acid in calcite precipitate morphology

Cited by 16 publications

References 85 publications

Successive Modes of Carbonate Precipitation in Microbialites along the Hydrothermal Spring of La Salsa in Laguna Pastos Grandes (Bolivian Altiplano)

Successive Modes of Carbonate Precipitation in Microbialites along the Hydrothermal Spring of La Salsa in Laguna Pastos Grandes (Bolivian Altiplano)

What are the different styles of calcite precipitation within a hyperalkaline leachate? A sedimentological Anthropocene case study

Abiotic and biotic processes controlling travertine deposition: Insights from eight hot springs in Japan

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