Microbial signatures from speleothems: A petrographic and scanning electron microscopy study of coralloids from the Koneprusy Caves (the Bohemian Karst, Czech Republic)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00539482" target="_blank" >RIV/61389005:_____/21:00539482 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985891:_____/21:00539482

Výsledek na webu

<a href="https://doi.org/10.1111/sed.12826" target="_blank" >https://doi.org/10.1111/sed.12826</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/sed.12826" target="_blank" >10.1111/sed.12826</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microbial signatures from speleothems: A petrographic and scanning electron microscopy study of coralloids from the Koneprusy Caves (the Bohemian Karst, Czech Republic)

Popis výsledku v původním jazyce

Exotic carbonate - siliceous coralloid speleothems of the Koneprusy Caves, which consist of dominant aggregates of feather-like, radial fibrous, dogtooth and gothic-arch calcite crystals, contain a diversity of petrified fossil microbes entombed in siliceous parts of the speleothems. Although a complete diagenetic continuum of SiO2 polymorphs, ranging from opal-A, through opal-CT, to moganite and crystalline quartz, was identified to form thin irregular laminae and the infills of secondary pores throughout the speleothems, the microbes have been preserved only in opal aggregates concentrated in younger growth zones of the speleothems. The identified biomorphic bodies included ovoid and spheroidal forms, interpreted as coccoid microbes, and tubular, bent and elongated forms believed to represent putative silicified filamentous microbes of unknown taxonomic affinity. Other biomorphic microstructures resembling biofilms, and plastic deformations and binary fissions of individual coccoid microbes have also been recognized. The silicified microbes, most of which have been heavily encrusted in situ, still reveal the presence of organic carbon and other biogenic elements detectable beneath their opal coats. Micro-cavities beneath and around coccoid microbes, interpreted as micro-borings, suggest that the microbes were able to remove the opal substrate by chemical etching. The morphology and mineralization styles of the microbes, the age of which was estimated to be in the range of 10(0) to 10(2) ka, exhibit similarities to silicified microbes from present-day siliceous hot-spring geysers and travertines. In contrast to the siliceous parts of the coralloids, the calcite crystals forming the matrix of the speleothems do not contain any calcified microfossils. However, deeply etched calcite crystals, spiky calcite sub-crystals, needle-fibre calcite and sparmicrite grains indicate that the processes of calcite dissolution-precipitation mediated by the microbes may have also affected the speleothem exteriors.

Název v anglickém jazyce

Microbial signatures from speleothems: A petrographic and scanning electron microscopy study of coralloids from the Koneprusy Caves (the Bohemian Karst, Czech Republic)

Popis výsledku anglicky

Exotic carbonate - siliceous coralloid speleothems of the Koneprusy Caves, which consist of dominant aggregates of feather-like, radial fibrous, dogtooth and gothic-arch calcite crystals, contain a diversity of petrified fossil microbes entombed in siliceous parts of the speleothems. Although a complete diagenetic continuum of SiO2 polymorphs, ranging from opal-A, through opal-CT, to moganite and crystalline quartz, was identified to form thin irregular laminae and the infills of secondary pores throughout the speleothems, the microbes have been preserved only in opal aggregates concentrated in younger growth zones of the speleothems. The identified biomorphic bodies included ovoid and spheroidal forms, interpreted as coccoid microbes, and tubular, bent and elongated forms believed to represent putative silicified filamentous microbes of unknown taxonomic affinity. Other biomorphic microstructures resembling biofilms, and plastic deformations and binary fissions of individual coccoid microbes have also been recognized. The silicified microbes, most of which have been heavily encrusted in situ, still reveal the presence of organic carbon and other biogenic elements detectable beneath their opal coats. Micro-cavities beneath and around coccoid microbes, interpreted as micro-borings, suggest that the microbes were able to remove the opal substrate by chemical etching. The morphology and mineralization styles of the microbes, the age of which was estimated to be in the range of 10(0) to 10(2) ka, exhibit similarities to silicified microbes from present-day siliceous hot-spring geysers and travertines. In contrast to the siliceous parts of the coralloids, the calcite crystals forming the matrix of the speleothems do not contain any calcified microfossils. However, deeply etched calcite crystals, spiky calcite sub-crystals, needle-fibre calcite and sparmicrite grains indicate that the processes of calcite dissolution-precipitation mediated by the microbes may have also affected the speleothem exteriors.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/EF16_019%2F0000728" target="_blank" >EF16_019/0000728: Výzkum ultrastopových izotopů a jejich využití v sociálních a environmentálních vědách urychlovačovou hmotnostní spektrometrií</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Sedimentology

ISSN

0037-0746

e-ISSN

1365-3091

Svazek periodika

68

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

29

Strana od-do

1198-1126

Kód UT WoS článku

000608824500001

EID výsledku v databázi Scopus

2-s2.0-85100052841