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

Result code in 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>

Alternative codes found

RIV/67985891:_____/21:00539482

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10304 - Nuclear physics

Project

<a href="/en/project/EF16_019%2F0000728" target="_blank" >EF16_019/0000728: Ultra-trace isotope research in social and environmental studies using accelerator mass spectrometry</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Name of the periodical

Sedimentology

ISSN

0037-0746

e-ISSN

1365-3091

Volume of the periodical

68

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

29

Pages from-to

1198-1126

UT code for WoS article

000608824500001

EID of the result in the Scopus database

2-s2.0-85100052841