MICROBIAL BIOSIGNATURES IN IRON-MINERALIZED PHOTOTROPHIC MATS AT CHOCOLATE POTS HOT SPRINGS, YELLOWSTONE NATIONAL PARK, UNITED STATES

@inproceedings{Parenteau2010MICROBIALBI,
  title={MICROBIAL BIOSIGNATURES IN IRON-MINERALIZED PHOTOTROPHIC MATS AT CHOCOLATE POTS HOT SPRINGS, YELLOWSTONE NATIONAL PARK, UNITED STATES},
  author={M. N. Parenteau and Sherry L. Cady},
  year={2010}
}
Abstract The origin of oxidized iron in Precambrian iron formations has been debated for decades. Direct paleontological evidence for a microbial role in iron oxidation has been sought in the biosignatures in these structures. This study documents how several biosignatures of phototrophic iron-oxidizing communities form in modern hydrothermal iron deposits. The microbes, primary minerals, microfossils, and stromatolitic biofabrics from Chocolate Pots hot springs in Yellowstone National Park… 
Microbial diversity and iron oxidation at Okuoku‐hachikurou Onsen, a Japanese hot spring analog of Precambrian iron formations
TLDR
Analysis of 16S rRNA gene amplicon sequencing of microbial communities across the range of microenvironments in OHK to describe the microbial diversity present and gain insight into the cycling of iron, oxygen, and carbon in this ecosystem suggest that productivity at OHK is based on aerobic iron-oxidizing Gallionellaceae.
Preserved Filamentous Microbial Biosignatures in the Brick Flat Gossan, Iron Mountain, California.
TLDR
HFO filaments are interpreted, found in both gossan types, as HFO-mineralized microbial filaments based in part on the presence of preserved central filament lumina in smooth HFO mineral filaments that are likely molds of microbialFilaments, mineral filament formation in actively precipitating iron-oxide environments, and high degrees of mineral filament bending consistent with a flexible microbial filament template.
Textural and mineralogical characteristics of microbial fossils associated with modern and ancient iron (oxyhydr)oxides: terrestrial analogue for sediments in Gale Crater.
TLDR
These terrestrial iron (oxyhydr)oxide examples are a valuable analogue because of similar iron- and clay-rich host rock compositions and will help understand diagenetic processes in a non-acidic, saline lacustrine environment such as the sedimentary rocks in Gale Crater, document specific biomediated textures, and provide a ground truth library of textures.
Iron minerals within specific microfossil morphospecies of the 1.88 Ga Gunflint Formation
TLDR
It is shown that specific microfossil populations of the 1.88 Ga Gunflint Iron Formation contain Fe-silicate and Fe-carbonate nanocrystal concentrations in cell interiors, which are consistent with in vivo intracellular Fe biomineralization, with subsequent in situ recrystallization, but contrast with known patterns of post-mortem Fe mineralization.
Morphology of biogenic iron oxides records microbial physiology and environmental conditions: toward interpreting iron microfossils.
TLDR
Observations of filamentous Fe(III)-oxyhydroxide microfossils from a ~170 Ma marine Fe-Si hydrothermal deposit show that these morphological characteristics can be preserved in the microf fossil record, demonstrating the potential of morphological biosignatures to reveal microbiology and environmental chemistry associated with geologic iron formation depositional processes.
Stable Isotope Probing for Microbial Iron Reduction in Chocolate Pots Hot Spring, Yellowstone National Park
TLDR
It is suggested that microbial Fe(III) oxide reduction is prominent in situ, with important implications for the generation of geochemical and stable Fe isotopic signatures of microbial Fe redox metabolism within Fe-rich circumneutral-pH thermal spring environments on Earth and Mars.
Microbial Fe(III) oxide reduction potential in Chocolate Pots hot spring, Yellowstone National Park.
TLDR
This analysis offers the first detailed insight into how DIR may impact the Fe geochemistry and isotope composition of a Fe-rich, circumneutral pH geothermal environment.
Pathways of microfossil mineralisation by hematite in the 1878 Ma Gunflint Formation
Abstract The ~1878 Ma Gunflint Formation contains some of the foremost examples of Palaeoproterozoic life but questions remain regarding the potential metabolic and taphonomic pathways within the
Preservation of protein globules and peptidoglycan in the mineralized cell wall of nitrate-reducing, iron(II)-oxidizing bacteria: a cryo-electron microscopy study.
TLDR
It is shown that the use of cryo-TEM instead of conventional microscopy provides detailed information of the successive iron biomineralization stages in anaerobic nitrate-reducing iron-oxidizing bacteria and offers a detailed view of the exceptional preservation of protein globules and the peptidoglycan within the Fe-mineralized cell walls of these bacteria.
Formation of biogenic sheath‐like Fe oxyhydroxides in a near‐neutral pH hot spring: Implications for the origin of microfossils in high‐temperature, Fe‐rich environments
A small hot spring that is informally called Fe-waterfall spring and is located in the Rehai geothermal area discharges hot (42 to 73 degrees C), near-neutral (pH = 7.65) Fe-rich water. Submerged
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