Microbially-induced Fe and Mn oxides in condensed pelagic sediments (Middle-Upper Jurassic, Western Sicily)

Préat, Alain; Mamet, Bernard; Stefano, Pietro Di; Martire, Luca; Kolo, Kamal

doi:10.1016/j.sedgeo.2011.03.001

Cited by 22 publications

(13 citation statements)

References 37 publications

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“…The Ammonitico Rosso ‐type limestones containing the DFeS suggest a transition from deep‐subtidal to hemipelagic environments, corresponding to a submarine plateau characterized by absence of light, scarcity of oxygen (indicated also by weak bioturbation), low sedimentation rate (indicated by ferruginous hardgrounds; cf. Préat et al, ; Préat, Morano, Loreau, Durlet, & Mamet, and references therein).…”

Section: Discussion and Interpretationmentioning

confidence: 98%

“…Regarding the Middle Jurassic ferruginous stromatolites, there are only few studies concerning the textural, compositional features, geochemistry, mineralogy, and the environmental context of their genesis. These studies suggest a possible microbial origin (e.g., Burkhalter, ; Grădinaru, ; Lazăr et al, ; Mamet & Préat, ; Préat et al, ; Préat et al, ; Préat, Mamet, Stefano, Martire, & Kolo, ; Reolid, Abad, & Martín‐García, ; Reolid & Molina, ; Reolid & Nieto, ) and only a few of them (Abad & Reolid, ; Préat et al, ; Reolid et al, ; Reolid & Nieto, ) report data concerning iron isotopes and REE content of such stromatolites structures.…”

Section: Introductionmentioning

confidence: 99%

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Microaerophilic Fe‐oxidizing micro‐organisms in Middle Jurassic ferruginous stromatolites and the paleoenvironmental context of their formation (Southern Carpathians, Romania)

et al. 2020

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Ferruginous stromatolites occur associated with Middle Jurassic condensed deposits in several Tethyan and peri-Tethyan areas. The studied ferruginous stromatolites occurring in the Middle Jurassic condensed deposits of Southern Carpathians (Romania) preserve morphological, geochemical, and mineralogical data that suggest microbial iron oxidation. Based on their macrofabrics and accretion patterns, we classified stromatolites: (1) Ferruginous microstromatolites associated with hardground surfaces and forming the cortex of the macro-oncoids and (2) Domical ferruginous stromatolites developed within the Ammonitico Rosso-type succession disposed above the ferruginous microstromatolites (type 1). Petrographic and scanning electron microscope (SEM) examinations reveal that different types of filamentous micro-organisms were the significant framework builders of the ferruginous stromatolitic laminae. The studied stromatolites yield a large range of δ 56 Fe values, from −0.75‰ to +0.66‰ with predominantly positive values indicating the prevalence of partial ferrous iron oxidation. The lowest negative δ 56 Fe values (up to −0.75‰) are present only in domical ferruginous stromatolites samples and point to initial iron mobilization where the Fe(II) was produced by dissimilatory Fe(III) reduction of ferric oxides by Fe(III)reducing bacteria. Rare-earth elements and yttrium (REE + Y) are used to decipher the nature of the seawater during the formation of the ferruginous stromatolites. Cerium anomalies display moderate to small negative values for the ferruginous microstromatolites, indicating weakly oxygenated conditions compatible with slowly reducing environments, in contrast to the domical ferruginous stromatolites that show moderate positive Ce anomalies suggesting that they formed in deeper, anoxic-suboxic waters. The positive Eu anomalies from the studied samples suggest a diffuse hydrothermal input on the seawater during the Middle Jurassic on the sites of ferruginous stromatolite accretion. This study presents the first interpretation of REE + Y in the Middle Jurassic ferruginous stromatolites of Southern Carpathians, Romania. K E Y W O R D S ferruginous stromatolites, iron isotopes, Jurassic, microbial signatures, rare-earth elements, Romania | 367 GRĂDINARU et Al. the reviewers Maxwell Lechte and Alain R. Préat and to the editor N. J. Planavsky for their corrections, comments, and suggestions that strongly improved the original manuscript. AUTH O R CO NTR I B UTI O N S M.G. and I.L. conducted the design, field work, prepared samples, thin sections, polished slabs, light micrographs, and acquired ESEM/ EDS data, performed XRF and CL analyses, microfacies analyses and wrote the paper. M.G. and M.N.D. performed REE + Y and iron isotopes measurements. L.P. acquired XRD data. O RCI D Mihaela Grădinaru https://orcid.org/0000-0003-3669-0472 S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Grădinaru M, Lazăr I, Ducea MN...

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Section: Discussion and Interpretationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Microaerophilic Fe‐oxidizing micro‐organisms in Middle Jurassic ferruginous stromatolites and the paleoenvironmental context of their formation (Southern Carpathians, Romania)

et al. 2020

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“…Early diagenetic precipitation of carbonate cements or lithification of sediment within the shells can be induced by bottom currents and dissolution of unstable carbonate particles (Mullins et al ., ). Such cementation is frequently reported in condensed deposits with hardgrounds (Mutti and Bernoulli, ; Preat et al ., ) and with cephalopods (Reolid et al ., ) and can represent a major mechanism that significantly prolongs half‐lives. Calcitic foraminifers likely have lower solubility, potentially contributing to their longer half‐lives, and thus higher time averaging, relative to aragonitic cephalopods.…”

Section: Discussionmentioning

confidence: 99%

Temporal and bathymetric resolution of nautiloid death assemblages in stratigraphically condensed oozes (New Caledonia)

et al. 2016

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Cephalopod shells can be affected by postmortem transport and biostratigraphic condensation, but direct estimates of the temporal and spatial resolutions of cephalopod assemblages are missing. Amino acid racemisation calibrated by 14 C demonstrates a centennial-scale time averaging (<500 years) of Nautilus macromphalus in sediment-starved, epi-and mesobathyal pelagic environments. The few shells that are thousands of years old are highly degraded. The median occurrence of dead shells is at 445 m depth, close to the 300-400 m depth where living N. macromphalus are most abundant. Therefore, dead shells of this species accumulate at a centennial temporal resolution and with excellent bathymetric fidelity. Dead Nautilus shells exist for only a few hundred years on the seafloor, in contrast to the biostratigraphically condensed mixture of extant foraminifers and foraminifers that went extinct during the Pleistocene. Cephalopod shells that do not show any signs of early diagenetic cementation are unlikely to be biostratigraphically condensed.

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“…Unequivocal evidence for microbial activity in Ammonitico Rosso facies is rarely recognized but microbial filaments have been identified in various samples under the SEM (Fig. B) and reported by other authors, who also identified evidence for microbial activity (Jenkyns, ; Préat et al ., , ). Progressively lower oxygen levels within the TAZ (Fig.…”

Section: Data Interpretation and Discussionmentioning

confidence: 99%

New insights into geochemical behaviour in ancient marine carbonates (Upper Jurassic Ammonitico Rosso): Novel proxies for interpreting sea‐level dynamics and palaeoceanography

et al. 2014

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Elemental concentrations in Phanerozoic sea water are known to fluctuate both in time and space. With regard to carbonates precipitated from marine fluids, elemental concentrations in the carbonate crystal lattice are affected by a complex array of equilibrium and non-equilibrium as well as postdepositional alteration processes. To assess the potential of carbonate elemental chemostratigraphy, seven Upper Jurassic sections were investigated along a proximal to distal transect across the south-east Iberian palaeomargin. The aim was to explore stratigraphic and spatial variations in calcium, strontium, magnesium, iron and manganese elemental abundances. The epicontinental geochemical record is influenced by the combination of continental runoff and a significant diagenetic overprint. In contrast, the epioceanic geochemical record agrees with reconstructed open marine sea water values, reflecting a moderate degree of syn-depositional to early marine pore water diagenesis. Establishing a fair degree of preservation of matrix micrite, a thorough statistical approach was applied and elemental associations tested for their environmental significance. Principal component and hierarchical cluster analyses revealed a persistent relation between carbonate magnesium, iron and strontium abundances. Processes related to early diagenetic nodulation in Ammonitico Rosso facies most probably account for the incorporation of these elements in the calcium carbonate lattice. The clear decoupling of carbonate manganese abundance with respect to the remaining elements is documented and related to high sea floor spreading rates and hydrothermal activity during the Late Jurassic. The investigation of potential time-fluctuation of geochemical patterns was approached through variogram computation. The observed temporal behaviour is most likely to be forced by relative sea-level dynamics, reflecting Late Jurassic palaeoceanographic conditions and potential planetary interactions. The data obtained in this study highlight the utility of elemental data from carbonate matrix micrites as geochemical proxies for studying the influence of remote trigger factors.

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Microbially-induced Fe and Mn oxides in condensed pelagic sediments (Middle-Upper Jurassic, Western Sicily)

Cited by 22 publications

References 37 publications

Microaerophilic Fe‐oxidizing micro‐organisms in Middle Jurassic ferruginous stromatolites and the paleoenvironmental context of their formation (Southern Carpathians, Romania)

Microaerophilic Fe‐oxidizing micro‐organisms in Middle Jurassic ferruginous stromatolites and the paleoenvironmental context of their formation (Southern Carpathians, Romania)

Temporal and bathymetric resolution of nautiloid death assemblages in stratigraphically condensed oozes (New Caledonia)

New insights into geochemical behaviour in ancient marine carbonates (Upper Jurassic Ammonitico Rosso): Novel proxies for interpreting sea‐level dynamics and palaeoceanography

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