Microcodium: An extensive review and a proposed non-rhizogenic biologically induced origin for its formation

Kabanov, Pavel; Anadón, Pere; Krumbein, Wolfgang E.

doi:10.1016/j.sedgeo.2008.02.003

Cited by 86 publications

(45 citation statements)

References 82 publications

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“…The calcrete microfabric is characterized by the presence of micritic mottles, root traces (e.g., rhizocretions and smaller root casts; Fig. 2), and associated biogenic structures such as fecal peloids (rounded micrite pellets resulting from invertebrate defecation in the soil) and relic structures of in-situ Microcodium-like aggregates (in the sense of Klappa 1980 andKabanov et al 2008). Unfortunately, Microcodium appears as partly to totally recrystallized calcite grains, so no primary morphology could not be identified.…”

Section: Paleozoic (Permian) Occurrencementioning

confidence: 99%

“…Two kinds of Microcodium were defined by Esteban (1972): 'Microcodium a' refers to typical Microcodium, consisting of prismatic calcite crystals; whereas 'Microcodium b' was defined by its smaller grain size and subquadrangular sections of its prisms (atypical Microcodium). Based on a large number of reports, the original interpretation of Microcodium as siphonaceous alga or any other phototrophic microorganism has been rejected; however, the process of Microcodium formation still remains unsolved (Klappa 1978;Alonso-Zarza et al 1998;Košir 2004;Kabanov et al 2008). Microcodium was interpreted as a calcification product of a mycorrhizae-cortical root cell association by Klappa (1978).…”

Section: Introductionmentioning

confidence: 99%

“…According to these authors, it may be produced by actinobacterial or fungal substrate mycelia, probably in association with other bacteria capable of consuming metabolites of the mycelial organism. Therefore, the typical Microcodium is a biologically-induced mineralization driven by a saprotrophic microorganism or a microbial association decomposing dead terrestrial organic matter (rootlets and earlier generations of fungi, humified organic matter) (Kabanov et al 2008). Kabanov et al (2008) provided an extensive review of the available literature for Paleozoic and Cretaceous-Cenozoic Microcodium occurrences.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the typical Microcodium is a biologically-induced mineralization driven by a saprotrophic microorganism or a microbial association decomposing dead terrestrial organic matter (rootlets and earlier generations of fungi, humified organic matter) (Kabanov et al 2008). Kabanov et al (2008) provided an extensive review of the available literature for Paleozoic and Cretaceous-Cenozoic Microcodium occurrences. Unfortunately, however, there was no mention of Hungarian Microcodium records in that article.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, as Microcodium can be seen as a natural product of actinobacterial or fungal activity, corresponding to the nano-to microscale interaction between decomposing organic matter and a microbial association (Kabanov et al 2008), this topic can trigger the multidisciplinary attention of researchers interested in the study of interactions of artificial nanostructures and biological systems.…”

Section: Introductionmentioning

confidence: 99%

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Pedogenic calcrete records in southern Transdanubia, Hungary: A brief review with paleoenvironmental and paleogeographic implications

Varga

Raucsik²

2014

Central European Geology

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In the Hungarian part of the Tisia Block, four occurrences of rhizolith-bearing pedogenic calcrete have been published, three of which are located in southern Transdanubia. Nodular calcrete with beta fabrics was documented from the lower Permian (Cisuralian) continental Korpád Sandstone Formation where the subaerial exposure section was developed on a strongly altered, volcanic shard-rich siliciclastic substrate. Additionally, two locations with Microcodium-bearing calcrete developed on a lower Jurassic carbonate substrate were published in the last few years. The scope of this study is to briefly summarize pedogenic calcrete records known from the Permian to the Cenozoic of southern Transdanubia (Tisia Block, Hungary), and to highlight their regional paleoenvironmental and paleogeographic importance.

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Section: Paleozoic (Permian) Occurrencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pedogenic calcrete records in southern Transdanubia, Hungary: A brief review with paleoenvironmental and paleogeographic implications

Varga

Raucsik²

2014

Central European Geology

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Facies distribution and depositional cycles in lacustrine and palustrine carbonates: The Lutetian–Aquitanian record in the Paris Basin

Moreau,

Andrieu,

Briais

et al. 2023

The Depositional Record

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The difficulty of correlating continental deposits hinders predicting lacustrine and palustrine carbonate facies variations in time and space. This study aims to understand better the factors governing these facies heterogeneities by measuring carbonate isotopes and conducting facies, petrographic and sequence stratigraphic analyses of the Lutetian–Aquitanian deposits of the Paris Basin, that record the transition from marine to lacustrine environments. Large‐scale correlations enabled the definition of two lacustrine–palustrine carbonate facies models. (1) The coastal lacustrine system (Bartonian to Rupelian), consists of fine‐grained brackish carbonate exhibiting episodic marine inputs during short‐term relative sea‐level maxima and evaporite sedimentation during relative sea‐level minima. Lacustrine sediments differ notably from marine ones with more negative δ13C and δ18O compositions that co‐vary and a biota adapted to low salinity conditions. In the associated palustrine environment, depositional sequences evolve upwards from micritic lacustrine deposits to nodular and then laminar calcretes. Microbial‐coated grains and rhizoliths indicate biological processes during repeated subaerial exposure phases in sub‐tropical to arid climates. (2) The inland lacustrine system (Rupelian and Aquitanian) was disconnected from the marine domain and showed evidence of microbial activity with microbial crusts and oncoidal rudstones. Facies rich in micritic intraclasts composed of palustrine and lacustrine facies indicate the reworking of already lithified sediments along the margins. In the palustrine domain, the calcrete facies are less abundant than breccias formed in‐situ by desiccation, limestones with root traces, or organic‐rich wackestones and marls. This system reflects a more temperate climate with more developed microbial structures and less exposed carbonates than the coastal lacustrine system. The southward migration of the depocentre and the transition from marine environments to (1) coastal and then (2) inland systems are controlled by uplift phases induced by Pyrenean and Alpine orogenesis. Third‐order relative sea‐level variations appear to control only short‐term cycles in coastal systems.

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Facies arrangement and cyclostratigraphic architecture of a shallow-marine, warm-water carbonate platform: the Late Carboniferous Ny Friesland Platform in eastern Spitsbergen (Pyefjellet Beds, Wordiekammen Formation, Gipsdalen Group)

Blomeier

Scheibner

Forke

2008

Facies

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During the Late Carboniferous, a spacious warm-water carbonate platform developed across the eastern part of the present Arctic archipelago of Svalbard. The platform initiated in the Moscovian on an uplifted fault block (Ny Friesland High) and progradated during the Late Moscovian to Early Kasimovian into the adjacent Campbellryggen Basin (central Spitsbergen). The fossiliferous platform strata are characterized by a pronounced cyclicity formed by stacked parasequences, which consist of deWned, subtidal to supratidal facies-set successions reXecting a general shallowing of the depositional area. Up to 17 of these shallowing-upward cycles, bounded by distinct discontinuity (marine Xooding) surfaces due to the recurrent emersion and subsequent Xooding of the platform surface, have been recognized within the platform strata. The stacked cycles are the result of global, glacio-eustatic, highfrequent and high-amplitudinal sea-level Xuctuations with eccentricity periodicities caused by ice volume changes during the Gondwana Land glaciation. Based on systematic changes of the cycles (thickness and internal facies composition), the upper part of the platform strata is interpreted as a progradational parasequence set of a late highstand system tract.

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Microcodium: An extensive review and a proposed non-rhizogenic biologically induced origin for its formation

Cited by 86 publications

References 82 publications

Pedogenic calcrete records in southern Transdanubia, Hungary: A brief review with paleoenvironmental and paleogeographic implications

Pedogenic calcrete records in southern Transdanubia, Hungary: A brief review with paleoenvironmental and paleogeographic implications

Facies distribution and depositional cycles in lacustrine and palustrine carbonates: The Lutetian–Aquitanian record in the Paris Basin

Facies arrangement and cyclostratigraphic architecture of a shallow-marine, warm-water carbonate platform: the Late Carboniferous Ny Friesland Platform in eastern Spitsbergen (Pyefjellet Beds, Wordiekammen Formation, Gipsdalen Group)

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