Ordered low-temperature dolomite mediated by carboxyl-group density of microbial cell walls

Kenward, Paul A.; Fowle, David A.; Goldstein, Robert H.; Ueshima, Masato; González, Luis A.; Roberts, J. A. Fraser

doi:10.1306/05171312168

Cited by 91 publications

(83 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(), a number of other reports have been published on the topic of laboratory synthesis of ordered dolomite by means of microbial mediation (e.g. Warthmann et al ., ; Van Lith et al ., ; Vasconcelos et al ., ; Wright & Wacey, ; Sánchez‐Román et al ., ; Bontognali et al ., ; Krause et al ., ; Kenward et al ., ; Roberts et al ., ). Here, several of these are evaluated.…”

Section: Dolomite Nucleation and Growth In Sedimentary Rocksmentioning

confidence: 98%

“…In every instance evaluated (Table ), where synthesis of dolomite under ambient conditions by means of microbial catalysis is claimed (Vasconcelos et al ., ; Warthmann et al ., ; Van Lith et al ., ; Vasconcelos et al ., ; Wright & Wacey, ; Sánchez‐Román et al ., ; Bontognali et al ., ; Krause et al ., ; Kenward et al ., ; Roberts et al ., ), the XRD data are either not provided, the data are equivocal with regard to cation ordering, or the data indicate that VHMC rather than dolomite was synthesized. Without having access to the same samples and performing independent analyses, it must be concluded that all of these laboratory products are VHMC.…”

Section: Dolomite Nucleation and Growth In Sedimentary Rocksmentioning

confidence: 98%

See 1 more Smart Citation

Mineralogy, nucleation and growth of dolomite in the laboratory and sedimentary environment: A review

et al. 2015

View full text Add to dashboard Cite

Dolomite [CaMg(CO 3 ) 2 ] forms in numerous geological settings, usually as a diagenetic replacement of limestone, and is an important component of petroleum reservoir rocks, rocks hosting base metal deposits and fresh water aquifers. Dolomite is a rhombohedral carbonate with a structure consisting of an ordered arrangement of alternating layers of Ca 2+ and Mg 2+ cations interspersed with CO 2À 3 anion layers normal to the c-axis. Dolomite has R 3 symmetry, lower than the (CaCO 3 ) R 3c symmetry of calcite primarily due to Ca-Mg ordering. High-magnesium calcite also has R 3c symmetry and differs from dolomite in that Ca 2+ and Mg 2+ ions are not ordered. High-magnesium calcite with near-dolomite stoichiometry (%50 mol% MgCO 3 ) has been observed both in nature and in laboratory products and is referred to in the literature as protodolomite or very high-magnesium calcite. Many dolomites display some degree of cation disorder (Ca 2+ on Mg 2+ sites and vice versa), which is detectable using transmission electron microscopy and X-ray diffractometry. Laboratory syntheses at high temperature and pressure, as well as studies of natural dolomites show that factors affecting dolomite ordering, stoichiometry, nucleation and growth include temperature, alkalinity, pH, concentration of Mg and Ca, Mg to Ca ratio, fluid to rock ratio, mineralogy of the carbonate being replaced, and surface area available for nucleation. In spite of numerous attempts, dolomite has not been synthesized in the laboratory under near-surface conditions. Examination of published X-ray diffraction data demonstrates that assertions of dolomite synthesis in the laboratory under near-ambient conditions by microbial mediation are unsubstantiated. These laboratory products show no evidence of cation ordering and appear to be very high-magnesium calcite. Elevated-temperature and elevated-pressure experiments demonstrate that dolomite nucleation and growth always are preceded by very high-magnesium calcite formation. It remains to be demonstrated whether microbial-mediated growth of very high-magnesium calcite in nature provides a precursor to dolomite nucleation and growth analogous to reaction paths in high-temperature experiments.

show abstract

Section: Dolomite Nucleation and Growth In Sedimentary Rocksmentioning

confidence: 98%

Section: Dolomite Nucleation and Growth In Sedimentary Rocksmentioning

confidence: 98%

Mineralogy, nucleation and growth of dolomite in the laboratory and sedimentary environment: A review

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Furthermore, dehydration of Mg 2+ and subsequent Mg incorporation into growing Ca-Mg carbonates can also take place in the presence of microorganisms, microbial exudates or other organo-molecules, leading to crystallization of magnesian calcite (e.g., Falini et al, 1996;De Yoreo and Dove, 2004;Rivadeneyra et al, 2004;Stephenson et al, 2008;González-Muñoz et al, 2010;Lenders et al, 2012;Han et al, 2013) and even (proto-)dolomite (e.g., Vasconcelos et al, 1995;Roberts et al, 2004Roberts et al, , 2013Sánchez-Román et al, 2008;Bontognali et al, 2012Bontognali et al, , 2014aZhang et al, 2012aZhang et al, , 2015. Moreover, carboxyl moiety (R-COO -) associated with microbes and organo-molecules have been identified as the crucial functional group facilitating the loading of Ca 2+ and Mg 2+ during Ca-Mg carbonate growth (Kenward et al, 2013;Qiu et al, 2017).…”

Section: The Possible Role Of Clay Minerals In Proto-dolomite Crystalmentioning

confidence: 99%

“…Proposed catalytic functions for microorganisms in dolomite formation include increasing dolomite saturation state and, providing cell walls and organic secretions (e.g., exopolymeric substances) serving as template for dolomite crystallization (McKenzie and Vasconcelos, 2009;Zhang et al, 2012aZhang et al, , 2015Kenward et al, 2013;Roberts et al, 2013;Bontognali et al, 2014a;Qiu et al, 2017). Noticeably, an argument is recently proposed by Gregg and co-workers who reevaluated the published XRD data of biogenic dolomites and found that these precipitates are proto-dolomite (or VHMC) rather than presumably reported ordered-dolomite (Gregg et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental evidence for abiotic formation of low-temperature proto-dolomite facilitated by clay minerals

Liu

Papineau

et al. 2019

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

The origin of sedimentary dolomite is a subject of long-standing enigma that still awaits resolution. Previous studies have shown that room temperature synthesis of abiotic dolomite is rarely achieved and primary (proto-)dolomite precipitation is closely associated with microbial activities. In this study, we demonstrate through laboratory carbonation experiments that highly negative-charged clay minerals (as indicated by the values of zetal potential) such as illite and montmorillonitecan aid the precipitation of abiotic proto-dolomite under ambient conditions, whereas nearly-neutral charged kaolinite exerts negligible influence on such process. In comparison to montmorillonite, illite has higher surface-charge density, thus is more effective in catalyzing protodolomite precipitation. Furthermore, the signal of proto-dolomite in carbonate neoformations is enhanced with increasing concentrations of illite or montmorillonite. On the basis of these results, we suggest that clay minerals catalyze dolomite formation perhaps via electrostatic binding of Mg 2+ and Ca 2+ ions and simultaneously desolvating these strongly hydrated cations, a crucial step for dolomite crystallization. The resulting proto-dolomites display the morphologies, textures, and structures similar to those of biogenic dolomite reported before, which are considered precursors of ordered sedimentary dolomite. Therefore, our results offer a possible route to authigenic dolomite found in sedimentary environments.

show abstract

“…Models of dolomite formation are mostly related to conditions of high Mg/Ca ratios and increased alkalinity (Last, ; Warren, ; Machel, ). Nevertheless, the topic of dolomite formation is still debated (Kenward et al ., ; Gregg et al ., ; Petrash et al ., ), with new ideas being proposed, such as the potential role of Mg‐rich clays at the precipitation media (Wanas & Sallam, ) and the possibility that dolomite may form independently to changes in the Mg/Ca ratio in a solution already saturated with respect to dolomite (McCormack et al ., ).…”

Section: Introductionmentioning

confidence: 98%

Formation of lacustrine dolomite in the late Miocene marginal lakes of the East Mediterranean (Northern Israel)

et al. 2019

View full text Add to dashboard Cite

The study focuses on the formation of lacustrine dolomite in late Miocene lakes, located at the East Mediterranean margins (Northern Israel). These lakes deposited the sediments of the Bira (Tortonian) and Gesher (Messinian) formations that comprise sequences of dolostone and limestone. Dolostones are bedded, consist of small-sized (<7 lm), Ca-rich (52 to 56 mol %) crystals with relatively low ordering degrees, and present evidence for replacement of CaCO 3 components. Limestones are comprised of a wackestone to mudstone matrix, freshwater macrofossils and intraclasts (mainly in the Bira Formation). Sodium concentrations and isotope compositions differ between limestones and dolostones: Na =~100 to 150 ppm;~1000 to 2000 ppm; d 18 O = À3Á8 to À1Á6&; À2Á0 to +4Á3&; d 13 C = À9Á0 to À3Á4&; À7Á8 to 0& (VPDB), respectively. These results indicate a climate-related sedimentation during the Tortonian and early Messinian. Wet conditions and positive freshwater inflow into the carbonate lake led to calcite precipitation due to intense phytoplankton blooms (limestone formation). Dry conditions and enhanced evaporation led to precipitation of evaporitic CaCO 3 in a terminal lake, which caused an increased Mg/Ca ratio in the residual waters and penecontemporaneous dolomitization (dolostone formation). The alternating lithofacies pattern reveals eleven short-term wet-dry climate-cycles during the Tortonian and early Messinian. A shift in the environmental conditions under which dolomite formed is indicated by a temporal decrease in d 18 O of dolostones and Na content of dolomite crystals. These variations point to decreasing evaporation degrees and/or an increased mixing with meteoric waters towards the late Messinian. A temporal decrease in d 13 C of dolostones and limestones and appearance of microbial structures in close association with dolomite suggest that microbial activity had an important role in allowing dolomite formation during the Messinian. Microbial mediation was apparently the main process that enabled local growth of dolomite under wet conditions during the latest Messinian.

show abstract

Ordered low-temperature dolomite mediated by carboxyl-group density of microbial cell walls

Cited by 91 publications

References 58 publications

Mineralogy, nucleation and growth of dolomite in the laboratory and sedimentary environment: A review

Mineralogy, nucleation and growth of dolomite in the laboratory and sedimentary environment: A review

Experimental evidence for abiotic formation of low-temperature proto-dolomite facilitated by clay minerals

Formation of lacustrine dolomite in the late Miocene marginal lakes of the East Mediterranean (Northern Israel)

Contact Info

Product

Resources

About