Consulta: subjectFacets:"Microbialites"
Registros recuperados: 3
Data/hora: 01/06/2024 06:39:32

The sediment microorganisms under the oxygen minimum zone: present day analogs of precambrian oceans?
Provedor de dados: 72
Autores: Gallardo,Victor Ariel; Espinoza,Carola.
A review of the latest findings relating big filamentous sublittoral bacteria of sediments under the oxygen minimum zone (OMZ) of the eastern Pacific, and, on the basis of associated morphological and environmental factors, an analysis and comparison of extant and Precambrian similar benthic microorganisms is performed. Based on the similarity between the two communities and the fact that certain features presented by extant bacterial mats may explain a special type of Precambrian stromatolites, i.e., the microbialites, we suggest that both extant big filamentous bacteria and their mats may represent analogs of those existing in Precambrian oceans providing opportunities for research and clues on the evolution of early life in the ocean's shelf sediments...
Tipo: Journal article
Palavras-chave: Sediment bacteria; Big bacteria; Microfossils; Precambrian; Proterozoic; Stromatolites; Microbialites; Bacterial mats.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300006

Environmental significance of microbialites in reef environments during the last deglaciation
Provedor de dados: 5
Autores: Camoin, G; Cabioch, G; Eisenhauer, A; Braga, J; Hamelin, B; Lericolais, Gilles.
In situ microbialites occurring in reef rocks dredged between 80 and 130 in water depth on the modern fore-reef slopes of Tahiti and the Marquesas islands yield ages ranging from 17,100 2900 to 4410 2250 years BP, suggesting that they played a prominent role during the last deglacial sea level rise.   Microbialites developed in both shallow and deep water depositional environments where they characterize various zones of the reef tracts (reef crests, upper reef slopes, deep fore-reef slopes), reflecting contrasting scenarios of microbialite development involving ''reefal microbialites'' in shallow-water settings and ''slope microbialites'' that formed in environments deeper than 1020 in and extending down to more than 100 m.   Reefal microbialites...
Tipo: Text
Palavras-chave: Sea level changes; Nutrients; French polynesia; Holocene; Last deglaciation; Microbialites; Coral reefs.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-4204.pdf

Depositional evolution of an extinct sinter mound from source to outflow, El Tatio, Chile
Provedor de dados: 5
Autores: Wilmeth, Dylan T.; Nabhan, Sami; Myers, Kimberly D.; Slagter, Silvina; Lalonde, Stefan; Sansjofre, Pierre; Homann, Martin; Konhauser, Kurt O.; Munoz-saez, Carolina; Van Zuilen, Mark A.
Siliceous sinter deposits from El Tatio, Chile, preserve a wide variety of depositional environments and biosignatures, from high-temperature (~85 °C) vent-proximal facies to distal deposits dominated by silicified microbial mats. Four cores were drilled into an El Tatio sinster mound and associated distal apron to investigate changes in hydrothermal environments over geologic timescales. Sedimentary and geochemical analysis of multiple sinter cores records the initiation and accretion of diverse depositional features still observed today in El Tatio. Facies adjacent to hydrothermal vents are dominated by laminated sinter crusts on the steep margins of a high-temperature pool, with sparse microbial preservation. Outer margins of the same pool contain...
Tipo: Text
Palavras-chave: Siliceous sinter; Hot springs; El Tatio; Microbialites; Microfossils.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75332/75994.pdf