Microbial action formed Jurassic Mn-carbonate ore deposit in only a few hundred years (Úrkút, Hungary)

Polgári, Márta; Hein, James R.; Tóth, Adrienn; Pál-Molnár, Elemér; Vígh, Tamás; Bíró, Lóránt; Fintor, Krisztián

doi:10.1130/g33304.1

Cited by 49 publications

(26 citation statements)

References 13 publications

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“…2-3), and contains considerable 300 amounts of celadonite reflecting suboxic formation and early diagenetic conditions, but the 301 rhodochrosite and goethite content is low. Owing to the fact that the Mn mineralization was 302 microbially-mediated (Polgári et al, 2012a), and that the goethite is the mineralized remains of 303 microbial mats (Polgári et al, 2012b), the organic matter content in this lower green part of the 304 section is low which explains the absence of barite. The middle brown part of the main ore bed 305 was a dense biomat system that existed under suboxic conditions and aided the 306 anoxic/anaerobic diagenetic formation of nontronite without sulfate reduction and pyrite 307 formation (Polgári et al, 2013, Fig.…”

Section: S Isotope Interpretation and Genetic Considerations Of Baritmentioning

confidence: 99%

“…The most part of the Úrkút Mn carbonate deposit is pyrite free, as in the ore zones the organic 230 matter alteration took place via microbially mediated Mn(IV,III) reduction and the system did 231 not reach the sulfate reduction zone; it remained suboxic (Polgári et al, 2012a(Polgári et al, , 2013. The 232 principal pyrite-bearing zones are within the black shales towards the top of the sequence.…”

Section: Sulfur Isotopes and Petrogenesis Of úRkút Pyrite 229mentioning

confidence: 99%

“…The genetic model of Polgári et al (2012) proposed that two cycles of 113 bacterial activity triggered ore formation: Cycle 1 was an aerobic chemolithoautotrophic cycle 114 that sequestered metal ions (Mn serving as a paleoenvironmental indicator of oxic conditions. Cycle 2 was an anaerobic/suboxic 117 heterotrophic bacterial cycle where early diagenetic bacterially mediated Mn(IV) and Mn(III) 118 reduction processes took place via organic matter oxidation and Mn-carbonate mineralization 119 (Polgári et al, 1991(Polgári et al, , 2012a. The ore sequence is laminated at the millimeter scale reflecting a 120 series of Fe-rich biomats (Polgári et al, 2012b).…”

Section: Geological Setting 97mentioning

confidence: 99%

“…In the case of Úrkút, mass balance calculations show that the 267 sedimentation rate was very high (Polgári et al, 2012a). 268…”

mentioning

confidence: 99%

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

et al. 2016

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Section: S Isotope Interpretation and Genetic Considerations Of Baritmentioning

confidence: 99%

Section: Sulfur Isotopes and Petrogenesis Of úRkút Pyrite 229mentioning

confidence: 99%

Section: Geological Setting 97mentioning

confidence: 99%

“…In the case of Úrkút, mass balance calculations show that the 267 sedimentation rate was very high (Polgári et al, 2012a). 268…”

mentioning

confidence: 99%

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

et al. 2016

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“…Ugyancsak a primer rétegsorokban előfordulnak réteges szerkezetű oxidos mangánércek (összesen 30 db fúrásban, pl. E-11, 14, -38, -76), amelyek esetében a primer keletkezés szintén felvetődik (Polgári et al 2012b …”

Section: Az éRces öSszletunclassified

A bakonyi mangánérc-bányászat fúrásainak komplex újraértékelése

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Hydrothermal nontronite formation associated with microbes from low‐temperature diffuse hydrothermal vents at the South Mid‐Atlantic Ridge

Peng

Chen

et al. 2017

JGR Biogeosciences

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Oceanic nontronite deposits have been identified to be closely related to low‐temperature hydrothermal activities. However, their formation mechanisms associated with microbes in diffuse hydrothermal vents still remain largely unknown. The friable deposits, collected from the low‐temperature diffuse flow at the Southern Atlantic Ridge, display a layered structure. Scanning electron microscope and transmission electron microscope analyses reveal that abundant filamentous, spherical, and rod‐shaped mineralized forms are preserved in the yellowish‐green layer of the deposits. These mineralized forms primarily consist of Si and Fe. Selected area electron diffraction patterns of the mineralized forms indicate that they are composed of nontronite. High intensities of 12C and 12C14N signals derived from cellular structures determined by nanosecondary ion mass spectrometry suggest the intimate relationship between nontronite and microbes. The results of 454 pyrosequencing analyses provide insights into the microbial communities involved in the biologically induced mineralization in the yellowish‐green layer. We propose an evolutionary model for establishing paragenetic sequences among nontronite, Mn oxide, and Fe oxyhydroxide in the deposits. This paragenetic sequence could be widespread in modern and ancient low‐temperature hydrothermal fields.

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Microbial action formed Jurassic Mn-carbonate ore deposit in only a few hundred years (Úrkút, Hungary)

Cited by 49 publications

References 13 publications

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

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

A bakonyi mangánérc-bányászat fúrásainak komplex újraértékelése

Hydrothermal nontronite formation associated with microbes from low‐temperature diffuse hydrothermal vents at the South Mid‐Atlantic Ridge

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