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Review

Can Primary Ferroan Dolomite and Ankerite Be Precipitated? Its Implications for Formation of Submarine Methane-Derived Authigenic Carbonate (MDAC) Chimney

1
School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
2
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(7), 413; https://doi.org/10.3390/min9070413
Submission received: 15 March 2019 / Revised: 7 June 2019 / Accepted: 25 June 2019 / Published: 5 July 2019
(This article belongs to the Special Issue Marine Geology and Minerals)

Abstract

:
Microbes can mediate the precipitation of primary dolomite under surface conditions. Meanwhile, primary dolomite mediated by microbes often contains more Fe2+ than standard dolomite in modern microbial culture experiments. Ferroan dolomite and ankerite have been regarded as secondary products. This paper reviews the process and possible mechanisms of microbial mediated precipitation of primary ferroan dolomite and/or ankerite. In the microbial geochemical Fe cycle, many dissimilatory iron-reducing bacteria (DIRB), sulfate-reducing bacteria (SRB), and methanogens can reduce Fe3+ to Fe2+, while SRB and methanogens can also promote the precipitation of primary dolomite. There are an oxygen respiration zone (ORZ), an iron reduction zone (IRZ), a sulfate reduction zone (SRZ), and a methanogenesis zone (MZ) from top to bottom in the muddy sediment diagenesis zone. DIRB in IRZ provide the lower section with Fe2+, which composes many enzymes and proteins to participate in metabolic processes of SRB and methanogens. Lastly, heterogeneous nucleation of ferroan dolomite on extracellular polymeric substances (EPS) and cell surfaces is mediated by SRB and methanogens. Exploring the origin of microbial ferroan dolomite may help to solve the “dolomite problem”.

1. Introduction

Microorganisms represented by bacteria are the most widely distributed life forms on Earth, and various types of inorganic minerals are the basis of the inorganic world. Microorganisms and minerals are closely involved on multiple levels: microbial formation of minerals, microbial dissolution of minerals, and redox between microorganisms and minerals with polyvalent metallic elements [1,2,3]. Among these interactions, redox is considered the key pathway influencing elemental geochemical cycles on the Earth’s surface [2,4,5]. On the one hand, chemoautotroph microbes obtain electron energy though the oxidation of reduced minerals, such as sulfide minerals and divalent iron minerals. On the other hand, oxidized minerals act as terminal electron receptors for microbes in their own respiration [1]. For the microbial formation of minerals, researchers have found many examples in recent years. Microbial activity was revealed to have a catalytic effect on the clay mineral reaction of montmorillonite-illite [6]. In subsequent studies, other clay minerals and microbes such as bacteria and archaea were studied under medium-high temperature. Researchers simulated a complex diagenetic history, and analyzed microbial activity in the diagenetic process for the control of clay mineral phase transformations, the preservation mechanisms of organic matter in sedimentary rocks’ clay minerals, and the potential for hydrocarbon generation in later stages [7].
In the microbial geochemical Fe cycle, iron is one of the essential nutrients that is often limited by the formation of insoluble Fe3+ under oxidizing conditions [8]. It has been shown in numerous experiments that iron oxides such as goethite and haematite undergo dissimilatory reduction to form secondary minerals such as magnetite and siderite with S. oneidensis MR-1 [9,10,11]. Many studies demonstrate that the bioprecipitation mechanism plays an important role in the banded iron formation (BIF) [12,13], iron-manganese nodules [14,15,16], and cold seep carbonate [17,18,19,20,21,22,23,24,25,26,27]. In addition, carbonate rock is the most common microbialite, and its genesis [28,29,30,31,32] and macro-micro fabrics are greatly affected by microorganisms [33]. Ferrous carbonate minerals used to be considered of a secondary origin mostly [34,35], but now, there are more and more experiments indicating that ferrous carbonate minerals, such as siderite, precipitate under surface conditions [36]. Additionally, there are some Fe2+ in the more famous microbial dolomite [37,38], which is one of the main directions for studying the origin of primary dolomite [1,28,29,30,31,32,36,37,38,39,40,41,42,43,44].
This article points out that the primary dolomite obtained in microbial culture experiments contains an indeterminate amount of iron. Authors summarize the research of the microbial geochemical Fe cycle under a surface condition and solve the problem how sulfate-reducing bacteria (SRB) and methanogens get Fe2+. The origin mechanism for primary dolomite is referenced and discussed, especially for ferroan dolomite mediated by microbes.

2. Microbial Geochemical Fe Cycle

2.1. Valence Changes of Iron in Different Ecological Niches

Iron, which is the fourth most abundant metal element in the Earth’s crust, is a main redox active element in the environment [8], and is widely involved in a series of geochemical cycles [45]. There are two common redox states for iron in nature: reduced ferrous iron (Fe(II)) and oxidized trivalent iron (Fe(III)). Fe(III) usually forms some insoluble and/or poorly soluble minerals under oxygen conditions, such as goethite, hematite, and fibrite, which are often limited by chemical reactions [1,5,8,9,10,11].
There are various microbial functional groups occupying different ecological niches, which have typical vertical zoning characteristics in the muddy sediment diagenesis zone (Figure 1) and distribute into an oxygen respiration zone (ORZ), an iron reduction zone (IRZ), a sulfate reduction zone (SRZ), and a methanogenesis zone (MZ) from top to bottom [46,47,48]. Additionally, there are certain transition intervals between these zones [48]. Therefore, Fe2+ obtained from reduction of Fe3+ in IRZ will migrate up and down at the same time. Those migrating upward are oxidized by oxygen and nitrate generally to form a new ferric oxide and then precipitate. The downward migration is often reacts with the H2S produced by the SRZ below it and, lastly, forms iron sulfide such as FeS and then is buried [49,50,51]. Moreover, the H2S produced in SRZ may also diffuse upward, directly reacting with the remaining iron oxides to form iron sulfide deposits, such as FeS [52,53].
However, it is not true that there is no Fe(III) below IRZ [48]. Indirect evidence is that the iron oxides undergo multiple redox reactions before the sediment enters the burial stage [54,55], and direct evidence is that there is an unusual thermophilic bacterium capable of promoting Fe(III) reduction in deep subsurface sediments [56]. In addition, it has been confirmed that the main strains in different depths can reduce Fe3+ directly [57].

2.2. Microbial Fe(III) Respiration

During the Fe cycle, the redox potential of Fe(III)-Fe(II) is located in the redox bonds formed by C, N, O, and S. Fe(III) is insoluble at ambient pH conditions even though it can still transfer electrons from cells to the surface of poorly soluble electron acceptors [11,58,59] (Figure 2). There are five ways to transfer electrons including: (1) increased dissolution of Fe(III) through the secretion and release of iron chelating agents, (2) adhesion between attachments and Fe(III) on the cell surface, (3) direct interaction of iron reductase and cytochrome with iron-containing minerals, (4) transfer of electrons from cells to Fe(III) assisted by electron shuttles, and (5) interactions with iron minerals relying on coenzymes in biofilms [8]. Most organisms can meet basic iron requirements through these five mechanisms [59,60], which are more important for microbes.
Microbes participate in the geochemical Fe cycle involving both oxidation and reduction. Microbial-mediated iron oxidation processes mainly include: O2 oxidation of Fe(II), biomineralization, photochemical processes, and oxidation of nitrates [58]. It used to be thought that the reduction of Fe(III) was indirect (such as by changing Eh or pH), and only a few microorganisms were able to transfer electrons to Fe(III) during its fermentation [61]. However, it is now believed that dissimilatory iron-reducing bacteria (DIRB) can transfer electrons to Fe(III) during Fe(III) respiration [62,63]. DIRB is the most important driving force for the reduction of Fe(II) in IRZ [11,56,64,65,66,67,68,69,70].
In anaerobic environments, certain microbes are capable of utilizing Fe(III) as the electron receptor in microbial respiration, called Fe(III) respiration [61,62,63], which thrives in IRZ. This process is reducing and involves a multi-mechanism synergistic interaction between the Fe(III)-reducing bacteria and some other microbes at the community or group level, which affects Fe(III) reduction [58].
The normal symbiosis of microbes in the Fe cycle includes symbiosis not only between one bacterium and another bacterium but also between bacteria and archaea such as methanogens. The phylogenetic tree constructed by previous researchers shows that the pure strains with iron reduction ability are mainly types of Proteobacteria (α-, β-, γ-, δ-Proteobacteria, etc.), Firmicutes, Acidobacteria, and some archaea [5,71]. These symbiotic microorganisms have different physiological characteristics (psychrophilic, thermophilic, and/or facultative/obligate anaerobic, etc.), and Geobacter and Shewanella are two representative strains among them [1].
Due to the technically limited current, it is unable to visually observe the molecular motion at the microbial-mineral interface, and to understand the specific details of electron transfer during Fe(III) respiration. According to Figure 2, Fe2+ is obtained by means of direct contact, electron shuttle assist, and/or coenzymes on biofilms [8]. For example, electrons of reductase and/or cytochrome on the biofilms of cells are transferred to Fe(III) by typical DIRB, such as Geobacter and Shewanella (Figure 3). However, Wang et al. used cryo-electron microscopy (cyro-EM) to identify the extracellular Omcs poly filaments of wild-type Geobacter. sulfurreducens, which has a unique spatial characteristic (Figure 2) and is the molecular basis for the long-range electron transport mechanism of microorganisms [72]. This is consistent with the Shewanella oneidensis MR-1 nanowire introduced by Gorby et al. [68]. In addition to these, it has been demonstrated that SRB can reduce a variety of high-valent metal elements, instead of using sulfate as a terminal electron acceptor only [61,73,74,75]. For example, the SRB strain Desulfotomaculum, isolated from a variety of heavy metal contaminated sludge deposits, can take respiration with high valence metal elements as terminal electron acceptors [76]. It was also found that SRB can reduce Fe(III) in clay minerals [57]. However, it is still unclear how the specific process of reduction of Fe(III) was induced by SRB Fe(III) respiration. There may be two mechanisms: (1) indirect reduction, in which H2S, the reduction product, can be used as a reducing agent to reduce and precipitate iron sulfide, and (2) direct enzymatic action, which mainly focuses on the recognition of metal reductase on biofilm [73,74,75,76].

3. Discussion: Microbial Mediation of Ferroan Dolomite Precipitation

3.1. Examples of Microbial-Mediated Precipitation of Ferroan Dolomite

Vasconcelos et al. cultivated Desulfovibrio, which is a group of desulfurizing bacteria in the Lagoa Vermelha lagoon, Brazil, for one year at a constant temperature of −4 °C and precipitated primary dolomite with a high iron content [37]. In the experiment, some precipitation of FeS was observed after one week of cultivation under anaerobic conditions, and then 1 ml of supernatant was added to a 20 mL bottle of a substance-containing medium and a quartz sand substrate that had been previously cleaned with dilute hydrochloric acid to remove all original carbonates. This experiment was the first example of primary dolomite mediated by microbes (Figure 4).
At present, microbe-mediated pathways to precipitate primary dolomite found around the world can be divided into four major categories, which are dissimilatory sulfate reduction, aerobic heterotrophy, methanogenesis (anaerobic oxidation of methane), and chemotrophic sulfide oxidation. In addition, aerobic heterotrophy and chemotrophic sulfide oxidation promote the precipitation under aerobic conditions, while the other two work without oxygen [46]. The types of representative strains and mediating conditions are shown in Table 1. Desulfovibrio is a strain of SRB, and the precipitation of primary dolomite mediated by acetoclastic methanogens reported by Roberts et al. is an example of methanogenesis [37,38].
It is difficult for dolomite to precipitate directly from solution under inorganic conditions at ambient temperature and pressure in the surface environment [77]. According to the International Mineralogical Association (IMA) guidelines, ankerite is obtained when Fe2+ substitutes for half of the Mg2+ in the dolomite crystal lattices, which is also not directly precipitated in the surface environment [78]. The standard dolomite and ankerite diffraction data in the International Center for Diffraction Data (ICDD) are shown in Table 2. Compared with the microbial-mediated dolomite d(hkl), with 102 and 122 peaks (Table 3), these data indicate that the experimental carbonate has a composition lying between dolomite and ankerite. There is no doubt that the mineral is a ferroan dolomite (Figure 4 and Figure 5). Although ankerite, in the strict sense, was not precipitated in these experiments, the microbial culture experiments revealed that iron would enter the dolomite crystal lattice during the microbial-mediated precipitation. A kind of calcium-rich, disordered ferroan dolomite was also found in n oil-contaminated aquifer near Bemidji, Minnesota, USA [38] (Figure 5), which was mediated by acetoclastic methanogens using Fe2+ produced by upper DIRB.

3.2. The Utilization of Fe2+ in Methanogans and SRB

Iron is an essential trace element for almost all organisms, and its morphology and bioavailability control the dynamics and function of ecosystems [8,69]. For example, the nanoparticles of Fe(III) minerals can adsorb other heavy metals that are unfavorable to organisms [70], and the redox process of Fe controls the concentration of toxic substance Arsenic in the environment [86]. For life activities, heterodisulfide reductase (a protein containing [Fe-S] cluster) in methanogens and the ruberdoxin (the simplest iron-sulfur protein) in the sulfate-reducing bacteria (SRB) are important enzymes in their metabolism [87,88]. Due to the redox activity of iron, it becomes a major player in the biogeochemical cycle. Fe2+ produced by organic matter reduction can supply microbial life activities in a reducing environment [2,5].
In the reaction in which anaerobic oxidation of methane (AOM) directly generates CH4, methyl-coenzyme M-reductase (Mcr) uses coenzyme B (HS–CoB), which is an electron donor, and reduces the terminal methyl carrier CH3–S–CoM to produce methane (Figure 6, Reaction (12)). In Reaction (13), heterodisulfide reductase (Hdr), as a key enzyme, can re-release coenzyme M and coenzyme B so that the methanogenesis process can be carried out continuously [87,89]. There are two types of Hdr [89,90]. One is necessary for methanogens using the reduced ferredoxin as electron donors. The other is to synthesize ATP by coupling with the reduction process of ferredoxin in the first step of the methanogenesis process. Fe2+, which is an essential component of ferredoxin, is important irreplaceably in methanogenesis. The Fe2+ produced by the DIRB in the Fe(III) respiration process compensates for the demand in MZ, and participates in various stages of metabolism with the enzyme.
SRB can reduce a variety of high valence metals [61,73,74,75]. Although the SRZ is located below the IRZ, Fe(III) reduction still occurs in the sulfate reduction zone [48,57]. Moreover, Fe3+ in IRZ is reduced to Fe2+, and then Fe2+ can migrate downward, reacting with H2S generated in SRZ below and, lastly, forming iron sulfide such as FeS [49,50,51]. The combination of Fe2+ and H2S precipitates FeS, which eliminates the toxicity of H2S to SRB and promotes its metabolism [91]. In addition, the high Fe2+ concentration has no inhibitory effect on SRB growth, because there is also a large amount of protein containing Fe2+ to complete metabolism, such as rubredoxin and desulforedoxin [88,91].

3.3. Possible Process of Microbial-Mediated Nucleation

PH and carbonate alkalinity in the micro-environment can be changed in microbial metabolism, in which substances that promote nucleation are secreted to precipitate carbonate minerals [3,36,79,92,93,94,95]. There are a variety of groups with negatively charged ligands with different coordination geometries on the cell surface and extracellular polymeric substances (EPS), including sugars, amino acids, carboxylate, phosphate, and sulphate complexes, which bind divalent metal cations and promote carbonate minerals to nucleate and precipitate on the surface of organic matter [36,96,97,98,99,100,101,102,103,104,105]. This process is heterogeneous nucleation, which is closely related to the formation of ancient carbonate, including limestone and dolomite [42,43,106,107]. In the process, amorphous carbonate minerals (ACM) with lower order are precipitated first [97,108], and ACM can grow continuously then [105], even siderite [36].
In the precipitation of ferroan dolomite mediated by microbes, many functional groups exposed on cell surfaces and EPS, such as carboxylic acid (R–COOH), hydroxyl (R–OH), amino acid (R–NH2), sulfate (RO–SO3H), sulfonic acid (–SO3H), and thiol (–SH), bind metal ions like Fe2+, Ca2+, and Mg2+, and provide nucleation sites [39,42,43,44]. For the Mg2+ that are difficult to enter the dolomite lattice, it may be complexed by carboxyl groups on the cell surface, dehydrated into [Mg(H2O)5(R–COO)]+ [109], decreased the energy required to precipitate carbonate minerals, and directly precipitated by heterogeneous nucleation on the EPS and cell surface. The pH and carbonate alkalinity of the local micro-environment are increased throughout the microbial metabolism, including SRB [37,82] and DIRB [67], which overcomes the kinetic energy of dolomite formation [37,84], and an SRB removing sulfate, which is a nucleating inhibitor, at the same time, which uniformly nucleates dolomite in solution [110].
It has been confirmed that microbial factors are necessary for precipitation of primary dolomite under normal temperature conditions. Many enzymes containing Fe2+ participate microbial metabolism and metal cations bind on cell surfaces and EPS. However, there may be other factors affecting the process of Fe2+ entering the dolomite lattice, such as the ion radius (the Fe2+ radius common in a mineral crystal structure is 0.061 nm, which is less than the Mg2+ 0.072 nm [111]). The mediation of ferroan dolomite still needs more detailed experiments.

3.4. Ankerite in Cold Seeps

Cold seeps are widely distributed on the active and passive continental marginal slopes and transform boundaries, mainly in the form of mounds, pockmark, chimneys, cement, and small veins [23,24]. Many studies show that cold seep carbonate is associated with hydrocarbon leakage, mainly methane, in a large scale [23,25,112,113,114]. In the Gulf of Cadiz, which is a huge hydrocarbon seep, there are a large number of carbonate chimneys consisting of Fe-rich dolomite, ankerite, high magnesium calcite, quartz, feldspar, and clays [112,113,114,115].
The δ13C data suggests that the carbon source of these authigenic carbonates is derived from methane [114,116]. Many microfabrics induced by microbial mineralization are observed with SEM, including filamentous, rod-shaped, dumbbell-shaped, and cauliflower dolomite [114]. The evidence suggests that microbes play an essential role in this process. In the sulfate-methane transition zone (SMTZ or SMT) under anaerobic conditions, due to the synergistic effects of methane-oxidizing archaea and SRB, including Methanosarcina, Desulfobulbus and Desulfosarcina [25,26,27,28,29,30], anoxic oxidation of methane (AOM) and sulfate reduction (SR) produce a large amount of HCO3 and HS. This causes an increase in environmental alkalinity, and results in authigenic carbonate minerals precipitation [23,25,112,113,114,115,116].
The Fe content of the primary dolomite in the Gulf of Cadiz is not significant [114], which has a texture similar to that of microbial-mediated dolomite in laboratories and surface lagoons [28,37,38,82,83,84,85]. However, oxygen isotope evidence indicates that their temperatures of formation are between 8.7 °C and 13.9 °C [112], which is lower than those in many laboratories and surface lagoons [28,38,82,83,84,85], but more than that achieved by Vasconcelos et al. (1995) [37]. The main source of iron in Fe-rich dolomite and ankerite in carbonate chimneys is sediment [113]. In other words, these Fe-rich dolomite and ankerite preserve evidence that some microbes mediate primary dolomite, but the microbes failed to directly enrich a large amount of iron into lattices of dolomite in the precipitation stage.

4. Conclusions and Future Directions

Fe(III), which is difficult to dissolve under surface conditions, cannot enter dolomite lattices, but insoluble Fe(III) and soluble Fe(II) are linked by microbes in the biogeochemical Fe cycle, especially Fe(III) respiration, which provides sufficient Fe2+ in anaerobic environments. Moreover, there are microbial cells and various functional groups on the surface adsorbing free metal cations. Fe2+ is involved in the metabolism of bacteria deeply as an important component of various enzymes. These functions make it possible for Fe2+ to enter dolomite lattices.
Future experiments can further be designed in both qualitative and quantitative aspects. Qualitative research studies can determine the process of Fe2+ entering the lattice and helps to understand the role of various organic groups such as EPS, ferredoxin, and iron-sulfur protein in the process. On the other hand, quantitative research studies explain how much Fe2+ precipitates in ferroan dolomite and then verify the yield of Fe2+ in the metabolic process of DIRB, methanogens, SRB, etc. Such research studies are beneficial for understanding organic dolomite precipitation. In addition, these studies are likely to provide new power to solve the “dolomite problem”.

Author Contributions

All the authors contributed to this paper. X.Y. and Q.L. concentrated on such phenomena. X.Y. discussed with F.X. and F.X. prepared and edited the manuscript. Y.L. drew some pictures. All the authors revised the manuscript.

Funding

The National Natural Science Foundation of China [grant number 41402102], and Fundamental Research Funds for the Central Universities [grant number 2652017132] financially supported this work.

Acknowledgments

We are grateful to the pioneers in this area for their experiments.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Schematic diagram of a microbial functional group zoning and Fe(III) mineral distribution [46,57].
Figure 1. Schematic diagram of a microbial functional group zoning and Fe(III) mineral distribution [46,57].
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Figure 2. Mechanisms of electron transfer from microorganisms to Fe(III) minerals [8,72].
Figure 2. Mechanisms of electron transfer from microorganisms to Fe(III) minerals [8,72].
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Figure 3. Physiological model of the biochemistry involved in microbial Fe(III) reduction by Shewanella and Geobacter spp. [5].
Figure 3. Physiological model of the biochemistry involved in microbial Fe(III) reduction by Shewanella and Geobacter spp. [5].
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Figure 4. SEM images of dolomite with high iron content in microbial culture experiments [37]. Both (A) and (B) are illustrating nanocrystals of the ferroan dolomite mediated by subpherical nanobacteria on the surface of the substrate.
Figure 4. SEM images of dolomite with high iron content in microbial culture experiments [37]. Both (A) and (B) are illustrating nanocrystals of the ferroan dolomite mediated by subpherical nanobacteria on the surface of the substrate.
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Figure 5. Micrographs of calcium-rich, disordered ferroan dolomite [38]. (A) Scanning electron microscopy (SEM) image; (B) Scanning laser confocal microscopy image; (C) Environmental SEM (ESEM) micrograph; (D) ESEM micrograph of the basalt surface in the sterile control.
Figure 5. Micrographs of calcium-rich, disordered ferroan dolomite [38]. (A) Scanning electron microscopy (SEM) image; (B) Scanning laser confocal microscopy image; (C) Environmental SEM (ESEM) micrograph; (D) ESEM micrograph of the basalt surface in the sterile control.
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Figure 6. Biochemical pathways of methanogenesis [87].
Figure 6. Biochemical pathways of methanogenesis [87].
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Table 1. Microbial metabolism associated with dolomite formation [39,46].
Table 1. Microbial metabolism associated with dolomite formation [39,46].
Metabolic Pathway Mechanism of MediationOrganisms IdentifiedMg/CaThe Initial Concentration of SO42− (mM)HCO3 (mM)Salinity (‰)Alkalinity of CarbonatepHTemperature (℃)The Shape of Dolomite PrecipitationSource Location (or Field Experiment Location)
Aerobic heterotrophy [79]Nitrate or nitrite, as a terminal electron acceptor, is reduced to ammonia to raise alkalinity.Halomonas meridiana, Virgibacillus marismortui84/11//35, 35/7.4, 7.325, 35Microspherical and ovate with granular surfaceBrejo do Espinho, Brazil
Chemotrophic sulfide oxidation (SO) [80]The reduced sulfur is used as an electron donor to reduce and fix the CO2 at the oxygen/sulfide interface. Precipitation of dolomite precursors benefit from diel fluctuating pH gradients of low temperature fluctuations thermodynamically at night.Mainly Microcoleus and Thiobacillus, growing with phototrophic Thiocapsa sp. symbiotically [81]About 0.18–0.88, approaching 1<0.2–6.2/Hypers-aline/6.8–7.7//Lagoa Vermelha and Brejo do Espinho, Brazil
Dissimilatory sulfate reduction [28,37,82,83]The organic carbon coupled to sulfate is used as a terminal electron acceptor, which removes sulfate and generates alkalinity under anaerobic conditions.Desulfovibrio group///Hypers-aline//4Near-spheroidal nanobacteria on the dolomite surface/
Desulfovibrio and DesulfotomaculaPostgate (1984) Medium B reflected lake water that many salts, including KH2PO4 (1.00 g), NH4Cl (2.00 g), CaSO4 (2.00 g), FeSO4·7H2O(1.00 g), MgSO4·7H2O (4.00 g), MgCl2·6H2O (11.00 g), and NaCl (59.00 g), were added in 2 L water under anoxic conditions.22Near-sphero-idal Coorong Lagoon, Australia
Desuifovibrio sp. LVform6 80/13, about 6030Hypers-alineHigh830Dumbbell-like shape, and the grape-like transforming into large pieces of hemispherical- spherical or broccoli clumpsLagoa Vermelha, Brazil
Desulfonatronovibrio. hydrogenovorans strain Z-793539/61–54/46030Hypers-alineHigh830Magadi, Kenya
Methanogenesis (coupled to anaerobic oxidation of methane) [38,84,85]Methanogenesis decrease dolomite saturation, and an increase in CO32− concentration leads to an increase in alkalinity, which may lead to dolomite supersaturation.Methanogens and DIRB135/458<0.0112.4Fresh-water/6.7425Rod-shaped cell surfaceA petroleum- contaminated aquifer near Bemidji, Minnesota, USA
Family Methanomicrobiaceae and genus Methanosaeta0.71/2.15Fresh-water/7.4230Rhombic dolomite/
Table 2. Standard dolomite and ankerite XRD data (ICDD data).
Table 2. Standard dolomite and ankerite XRD data (ICDD data).
Standard DolomiteStandard Ankerite
dI/I0hkldI/I0hkl
4.03311014.051<1101
3.69930123.7142012
2.8881001042.906100104
2.67040062.6934006
2.53930152.556<1015
2.40481102.4144110
2.193251132.2037113
2.06540212.073<1021
2.01542022.0246202
1.84750241.8562024
1.805160181.8188018
1.787211161.79710116
1.78030091.7955009
1.56742111.5732211
1.54571221.5504122
1.46542141.4724214
1.44442081.4524208
1.38943001.3942300
Table 3. Comparison of the lattice parameters of dolomite synthesized with microbes and standard dolomite and ankerite [37].
Table 3. Comparison of the lattice parameters of dolomite synthesized with microbes and standard dolomite and ankerite [37].
Miller IndexSampleDolomiteAnkeriteCalcite
(hkl)d(hkl) Åd(hkl) Åd(hkl) Åd(hkl) Å
1023.713.693.703.86
1102.402.412.412.49
1221.551.541.551.60
1042.942.892.903.03

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Xu, F.; You, X.; Li, Q.; Liu, Y. Can Primary Ferroan Dolomite and Ankerite Be Precipitated? Its Implications for Formation of Submarine Methane-Derived Authigenic Carbonate (MDAC) Chimney. Minerals 2019, 9, 413. https://doi.org/10.3390/min9070413

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Xu F, You X, Li Q, Liu Y. Can Primary Ferroan Dolomite and Ankerite Be Precipitated? Its Implications for Formation of Submarine Methane-Derived Authigenic Carbonate (MDAC) Chimney. Minerals. 2019; 9(7):413. https://doi.org/10.3390/min9070413

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Xu, Fan, Xuelian You, Qing Li, and Yi Liu. 2019. "Can Primary Ferroan Dolomite and Ankerite Be Precipitated? Its Implications for Formation of Submarine Methane-Derived Authigenic Carbonate (MDAC) Chimney" Minerals 9, no. 7: 413. https://doi.org/10.3390/min9070413

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