Correlated chemostratigraphy of Mn-carbonate microbialites (Úrkút, Hungary)

Polgári, Márta; Németh, Tibor; Pál-Molnár, Elemér; Futó, István; Vígh, Tamás; Mojzsis, Stephen J.

doi:10.1016/j.gr.2014.12.002

Cited by 23 publications

(6 citation statements)

References 24 publications

(11 reference statements)

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“…A second tuff near the top of the Datangpo Formation was dated by the LA-ICP-MS zircon U-Pb method to 654.5±3.8 Ma (Zhang et al, 2008 (Tribovillard et al, 2006). Mn(II) oxidation is commonly facilitated by autotrophic microbial activities (Tebo et al 2004;Morgan, 2005), as a consequence of which formation of authigenic Mn-OOH phases is often accompanied by large amounts of reactive microbial organic matter in the sediment (Polgári et al, 2012a(Polgári et al, , 2016. In aqueous systems with oxidizing waters overlying anoxic waters (as in anoxic marine basins and most marine sediments), Mn is vertically cycled, with solid-phase Mn(IV) particulates that form at or just above the redoxcline being reductively dissolved within the deeper water column or at/below the sediment-water interface (Calvert and Pedersen, 1996;Roy, 2006;Maynard, 2003Maynard, , 2014.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Genesis of Cryogenian Datangpo manganese deposit: Hydrothermal influence and episodic post-glacial ventilation of Nanhua Basin, South China

Algeo

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Neoproterozoic Datangpo Formation of the Nanhua Basin in South China records interglacial sedimentation between the ~720-660-Ma Sturtian and ~654-635-Ma Marinoan glaciations. The lower part (1 st Member) of this formation contains manganese-rich deposits that represent a mixture of two main components, Mn-carbonates and Mn-bearing aluminosilicates (clay minerals). The Mn-carbonate component is characterized by high La/Sc ratios, high initial 87 Sr/ 86 Sr ratios, and low initial εNd(t) values, and the siliciclastic component by low La/Sc ratios, low initial 87 Sr/ 86 Sr ratios, and high initial εNd(t) values. The likely source of the non-radiogenic

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Section: Accepted Manuscriptmentioning

confidence: 99%

Genesis of Cryogenian Datangpo manganese deposit: Hydrothermal influence and episodic post-glacial ventilation of Nanhua Basin, South China

Algeo

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Mn(IV) oxides may then be further reduced to form Mn-carbonates or Mn-silicates, also through microbially mediated processes (Thamdrup et al, 2000;Johnson et al, 2016a,b). A series of recent publications examining the participation of microbes in the genesis of selected Mn deposits ranging in age from Precambrian to Mesozoic suggest a common microbially mediated metallogenic mechanism (Fan et al, 1999;Polgári et al, 2012aPolgári et al, , 2012bPolgári et al, , 2016bBiondi and Lopez, 2017;Rajabzadeh et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Microbial metallogenesis of Cryogenian manganese ore deposits in South China

Polgári

Gyollai

et al. 2019

Precambrian Research

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The Datangpo Formation manganese deposits (DFMnD) in South China formed during the interglacial stage between the Sturtian and Marinoan glaciations of the Cryogenian period. These black shale-hosted deposits are composed of massive Mncarbonates with microscopic laminae/laminations and cherty veins. To date, it has been thought that the DFMnD formed through inorganic processes, which were controlled by redox changes in the post-Sturtian Nanhua Rift Basin, South China. However, in this study, systematic petrographic, mineralogical, and geochemical analyses indicate a microbially mediated origin of the Mn ore deposits. Mineralized microbial woven micro-textures (observed at the μm scale) and microbial fossils are common in the laminated Mn-carbonate ores. We infer that microbial enzyme activity formed poorly crystallized Mn oxide/hydroxides and carbonaceous material, which 2 transformed to rhodochrosite, kutnohorite, ankerite/dolomite, framboidal pyrite, and apatite via diagenesis. Some micro-scale quartz and K-feldspar may be detrital but most appears to have formed during diagenesis or through hydrothermal activity. A micro-mineralogical profile determined by 2500 spectra via high-resolution in situ micro-Raman spectroscopy also revealed cyclic laminations of Ca-rhodochrosite as microbialite (ankerite/dolomite) and quartz, indicating a mineralized biomat system. Ca-rhodochrosite transformed to kutnohorite under elevated temperatures, as indicated by the maturation level of organic matter (determined via Raman spectroscopy). Alternating micro-laminae denote cyclic changes in microbial groups (Mn-and Fe-oxidizing microbes versus cyanobacteria) during the formation of the Mn ore deposits. Our proposed model for the microbially mediated metallogenesis of Mn-carbonate deposits begins with enzymatic multi-copper oxidase processes associated with autotrophic microbial activity under obligatory oxic conditions, which results in the precipitation of Mn bio-oxides. Following their burial in organic-rich sediments, the Mn(IV) oxides and hydroxides are reduced, producing soluble Mn(II) via processes mediated by heterotrophic microbes under suboxic conditions, which in turn form the Mn-carbonates. This microbial metallogenesis model for the Cryogenian DFMnD in South China is similar to that proposed for the Jurassic Úrkút Mn deposit in Hungary, indicating that a two-step microbially mediated process of Mn ore formation might be common throughout geological history.

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“…The Chinese study shows more similarities to the manganese ore formation found in Hungary than the Brazilian study does. There are about 480 million years between the Úrkút and the Datangpo formations; however, the processes characterizing their ore enrichment and metallogenetic mechanisms are similar (Polgári et al, 2012a, b, 2013, 2016a,b; Molnár et al, 2017; Yu et al, 2019). Both of them are Mn carbonate (Ca rhodochrosite and kutnohorite) ore in black shale environment, in which only the amount of iron differs.…”

Section: Discussionmentioning

confidence: 99%

Microbially Mediated Ore-Forming Processes and Cell Mineralization

Polgári¹,

Gyollai²,

Fintor³

et al. 2019

Front. Microbiol.

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Sedimentary black shale-hosted manganese carbonate and oxide ores were studied by high-resolution in situ detailed optical and cathodoluminescence microscopy, Raman spectroscopy, and FTIR spectroscopy to determine microbial contribution in metallogenesis. This study of the Urucum Mn deposit in Brazil is included as a case study for microbially mediated ore-forming processes. The results were compared and interpreted in a comparative way, and the data were elaborated by a complex, structural hierarchical method. The first syngenetic products of microbial enzymatic oxidation were ferrihydrite and lepidocrocite on the Fe side, and vernadite, todorokite, birnessite, and manganite on the Mn side, formed under obligatory oxic (Mn) and suboxic (Fe) conditions and close to neutral pH. Fe- and Mn-oxidizing bacteria played a basic role in metallogenesis based on microtextural features, bioindicator minerals, and embedded variable organic matter. Trace element content is determined by source of elements and microbial activity. The present Urucum (Brazil), Datangpo (China), and Úrkút (Hungary) deposits are the result of complex diagenetic processes, which include the decomposition and mineralization of cell and extracellular polymeric substance (EPS) of Fe and Mn bacteria and cyanobacteria. Heterotrophic cell colonies activated randomly in the microbialite sediment after burial in suboxic neutral/alkaline conditions, forming Mn carbonates and variable cation-bearing oxides side by side with lithification and stabilization of minerals. Deposits of variable geological ages and geographical occurrences show strong similarities and indicate two-step microbial metallogenesis: a primary chemolithoautotrophic, and a diagenetic heterotrophic microbial cycle, influenced strongly by mineralization of cells and EPSs. These processes perform a basic role in controlling major and trace element distribution in sedimentary environments on a global level and place biogeochemical constraints on the element content of natural waters, precipitation of minerals, and water contaminants.

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Correlated chemostratigraphy of Mn-carbonate microbialites (Úrkút, Hungary)

Cited by 23 publications

References 24 publications

Genesis of Cryogenian Datangpo manganese deposit: Hydrothermal influence and episodic post-glacial ventilation of Nanhua Basin, South China

Genesis of Cryogenian Datangpo manganese deposit: Hydrothermal influence and episodic post-glacial ventilation of Nanhua Basin, South China

Microbial metallogenesis of Cryogenian manganese ore deposits in South China

Microbially Mediated Ore-Forming Processes and Cell Mineralization

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