Formation of aragonite cement by nannobacteria in the Great Salt Lake, Utah

Pedone, Vicki A.; Folk, Robert L.

doi:10.1130/0091-7613(1996)024<0763:foacbn>2.3.co;2

Cited by 67 publications

(39 citation statements)

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“…Aragonite needles have been described in the literature and are related to whitings. They are also produced by calcareous algae and microorganisms in marine and lacustrine environments (Lowenstam, 1955;Lowenstam and Epstein, 1956;Macintyre and Reid, 1992;Pedone and Folk, 1996), or precipitated experimentally (Callame and Dupuis, 1972;Zhou and Zheng, 2003).…”

Section: Needle-shaped Aragonite Crystalsmentioning

confidence: 99%

Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean Altiplano, during the last 12.3kyr

Pueyo

Sáez

Giralt

et al. 2011

Palaeogeography, Palaeoclimatology, Palaeoecology

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Sediments in lakes in the Andean volcanic setting are often made up of diatomaceous ooze together with volcaniclastics and small amounts of carbonates. Despite their scarcity, carbonates along with organic matter provide significant paleoenvironmental information about lake systems. This study focuses on the carbonates in Lake Chungará, their morphologies, distribution and origin deduced from the isotopic markers. These markers reflected changes in the water and the biomass between the onset of the Holocene and around 9.6 cal kyr BP. These changes are marked by general increases in TOC, TN, and TN-δ 15 N AIR , and by fluctuating values of TOC-δ 13 C VPDB in its sediments and are probably related to major shifts in the lake surface/volume associated with rises in lake level. An increase in salinity around 10 cal kyr BP is thought to be linked to a short dry period, giving rise to the onset of carbonate production. The mid-Holocene arid period between 7.3 and 3.5 cal ka BP, with a maximum of aridity around 6.0 cal kyr BP, was deduced from δ 18 O VPDB values in the endogenic carbonates. These results match the reconstructions in Lake Titicaca based on benthic diatoms and paleoshore levels. Offshore sediments mainly consist of a diatomaceous ooze, laminated in the lower half (Unit 1), and bandedmassive with tephra layers in the upper half of the sequence (Unit 2). TOC-δ 13 C VPDB and the C/N ratio confirm that phytoplankton was the main source of organic matter in these sediments. Shallower sediments (units 3 to 5) developed in platform and littoral settings, providing evidence of subaqueous macrophytes and, to a lesser extent, land plants. Carbonate content ranges between 0.1 and 6 wt.% in offshore settings (30 to 40 m water depth) and reaches the maximum values in the lower part of Unit 2. Carbonate minerals (low magnesium calcite and minor amounts of high magnesium calcite and aragonite) are scarce and are arranged in mm-thick layers, commonly forming cm-thick levels or bioclasts. Carbonate layers are made up of euhedral-to-subhedral spindle-shaped calcite crystals and, to a lesser extent, aragonite needles, all in the μm range. Aragonite spheroids coexist in littoral sediments with other carbonate shapes and charophyte remains, where carbonate reaches locally up to 20 wt.%. CO 2 photosynthetic depletions related to seasonal phytoplankton blooms were responsible for the high frequency deposition of mm-thick carbonate layers.The average values for δ 13 C VPDB in lake water, plankton and sediments of Lake Chungará (as organic matter or as carbonate) are around 15‰ higher than commonly reported values in other lakes. This 13 C enrichment is attributed to carbon assimilation from a DIC affected by methanogenesis, in which HCO 3 − is the dominant species. The δ 13 C VPDB and δ 18O VPDB variations and their covariation in endogenic carbonates suggest that lake water volume and lake level increased along the Holocene.

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Section: Needle-shaped Aragonite Crystalsmentioning

confidence: 99%

Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean Altiplano, during the last 12.3kyr

Pueyo

Sáez

Giralt

et al. 2011

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The identification and existence of nannobacteria and nanobacteria was not new and had been proposed previously by a number of workers (Folk, 1993;Sillitoe et al, 1996;Pedone and Folk, 1996;Vasconcelos and Mckenzie, 1997;Folk and Lynch, 1997;Kajander et al, 1994;Kajander et al, 1998). The existence of nan(n)obacteria, however, has been fiercely questioned, since it is argued that the minimum size of autonomous life is 200 nm in diameter for a spherical cell (Vogel, 1998).…”

Section: Biodiversity Of New South Wales Subterranean Faunamentioning

confidence: 99%

Revisions of Australian ground-hunting spiders: I. Amauropelma gen. nov. (Araneomorphae: Ctenidae)

Raven¹,

Stumkat²,

Gray³

2001

Rec West Aust Mus Sup

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“…Epitaxial growth of goethite on kaolinite in weathered laterites has been reported (Boudeulle and Muller, 1988), and otavite (CdC03) was observed to grow epitaxially on calcite from an aqueous solution (Chiarello and Sturchio, 1994). Oriented growth, sometimes called epitaxy, is commonly observed during (aqueous) biomineralization (e.g., Pedone and Folk, 1996). Organic surfaces can function as structural templates that stimulate precipitation and guide the deposition of inorganic ions from saturated aqueous solutions.…”

Section: Magnetite Whisker Morphologies and Vapor-phase Growthmentioning

confidence: 99%

Epitaxial growth of nanophase magnetite in Martian meteorite Allan Hills 84001: Implications for biogenic mineralization

Bradley

McSween

Harvey

1998

Meteorit & Planetary Scien

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Abstract-Crystallographic relationships between magnetite, sulfides, and carbonate rosettes in fracture zones of the Allan Hills (ALH) 84001 Martian meteorite have been studied using analytical electron microscopy. We have focused on those magnetite grains whose growth mechanisms can be rigorously established from their crystallographic properties. Individual magnetite nanocrystals on the surfaces of carbonates are epitaxially intergrown with one another in "stacks" of single-domain crystals. Other magnetite nanocrystals are epitaxially intergrown with the surfaces of the carbonate substrates. The observed magnet- with lattice mismatches of -13% and -11%, respectively. Epitaxy is a common mode of vapor-phase growth of refractory oxides like magnetite, as is the spiral growth about axial screw dislocations previously observed in other magnetite nanocrystals in ALH 84001. Epitaxy rules out intracellular precipitation of these magnetites by (Martian) organisms, provides hrther evidence of the high-temperature (> 120 "C) inorganic origins of magnetite in ALH 84001, and indicates that the carbonates also have been exposed to elevated temperatures.

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Formation of aragonite cement by nannobacteria in the Great Salt Lake, Utah

Cited by 67 publications

References 0 publications

Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean Altiplano, during the last 12.3kyr

Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean Altiplano, during the last 12.3kyr

Revisions of Australian ground-hunting spiders: I. Amauropelma gen. nov. (Araneomorphae: Ctenidae)

Epitaxial growth of nanophase magnetite in Martian meteorite Allan Hills 84001: Implications for biogenic mineralization

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