Recent Travertine Pisoliths (Pisoids) from Southeastern Idaho, U.S.A.

Chafetz, Henry S.; Meredith, John C.

doi:10.1007/978-3-642-68869-0_39

Cited by 29 publications

(22 citation statements)

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“…Thereare severaltypesof organic deposits in the geothermal field of Sicakeermik as described by Risacher and Eugster (1979), Chafetz and Butler (1980), Meredith (1980), Schreiber et al (1981), Chafetz and Meredith(1983), Chafetz and Folk (1984), Love and Chafetz (1988), Guo and Riding (1992, 1994, 1998, Renaut et al (1998), and Chafetz and Iron -and manganese -rich shrubfabrics form on low -angle slopesin microfalls/microcascades as wellas at the edgesof microterraces. Shrub fabrics can be considered somewhat equivalent to "fossil bacteria stromatolithes" described by Walter (1976).…”

Section: Evidence Of Microbiologic Activity In Travertinesmentioning

confidence: 95%

Evidence of microbiologic activity in modern travertines: Sicakcermik geothermal field, central Turkey

Teki̇n

Kayabalı

Ayyidiz

et al. 2000

Carbonates Evaporites

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Modem travertine deposits are observed in the Sicakcermikhot springs located northwest of Sivas, central Anatolia. They are the carbonate deposits of crustal (spongy) and/or alabaster-textured formationscontrolledby both organic and inorganicprocesses. The structuresformed under the influenceof inorganicprocesses includethe accumulationson the fissure and joint ridges. These structures are adjacent to the hot water emergence spots representing the points of rapid hot water flow and sudden release of CO 2 , The structures developedunder the influence of organicprocesses form in areas at relativelyfarther distancesfrom the hot water emergencepoints. These structures were described to be "waterfall or cascade deposits"; "terrace-mound travertines"; and "shallow lake fans" by different researchers. They are recognized in the field by special identifying trails such as manganous-ferrous travertine shrubs resembling ivy, siliceous stromatolites, and ferrous pisoids, 3 to 12 mm in diameter.All the modern travertinesamplesexamined are dominantlyformedby subidiomorphicprismatic-tabular calcite crystals. ScanningElectronMicroscopyrevealed that calcite crystalsforming the pisoids arecharacterizedby zonal growth. Stromatoliticformations,on theother hand.bear regularjoints developed as a consequenceof sudden cooling and some special structuresindicativeof bacterial activity (in the form of nodule, spheroid, ellipsoid, column,filament and honeycombor grape bunch structures). In addition, secondary dissolutionvugs and pores giving way to the release of CO 2 are associated structures with the stromatolitic formations. The data collected from all the utilized techniquessuggest that the microbiological formations observedin the travertinesof Sicakcermikhot spring were produced by the sulfatereducing, boring-budding bacteria such as Coccoids, Pedomicrobium, Beggiatoa sp., Thiobacillus sp., as well as blue-green algae (Cyanobacteria).The travertineoccurrencesproducedby both organic and inorganicprocesseshave an annual averageof 3-5emdepositionin thickness. The hot water emergence points and their flowpaths manifest seldom-found natural features. These natural monuments are irresponsibly destroyedfor several reasons. The authors argue that these formations, significantfrom the point of view of their occurrencemechanism as well as their final products, must be preserved. If accomplished, a modem natural monument similar to that in Pamukkale (furkey) and YellowstoneNational Park (Wyoming,USA) could develop within a reasonable length of time.

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Section: Evidence Of Microbiologic Activity In Travertinesmentioning

confidence: 95%

Evidence of microbiologic activity in modern travertines: Sicakcermik geothermal field, central Turkey

Teki̇n

Kayabalı

Ayyidiz

et al. 2000

Carbonates Evaporites

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“…Micropores are observed in spar crystals encrusting some filaments and also in some rodlike organic structures. These possibly indicate sites once occupied by bacteria (Chafetz and Meredith 1983;Folk et al 1985) and are comparable to 'wormy pecan' fabric (Folk et al 1985). Tiny and spherical to elliptical bodies (1-2 urn in diameter) occur on cyanobacterial filaments which may be bacteria.…”

Section: Microfabricmentioning

confidence: 99%

Sedimentology of holocene tufa carbonates in Orissa State, India

Das

Mohanti

2005

Carbonates Evaporites

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Holocene tufas of Orissa State, India, are formed in stream / fluvial environments. Sparry and micritic laminae in stromatolitic tufa represent seasonal deposition and contain cyanobacteria and diatoms. Micropores in spar crystals suggest bacterial activity. Aragonitic laminae show radial, bushy, and spherulitic fabrics which may be microbially controlled. Phytohermal (moss-rich) tufas show micritic to microsparry encrustations and reveal epiphytic microorganisms. CO 2 degassing due to agitation from waters supersaturated with respect to calcite, is the dominant process of precipitation. Aragonite precipitation is possibly controlled by Sr concentrations in the waters. Pisoids have been formed by alternate disposition of micritic and microsparry laminae and sediment-rich zones around intraclastic tufa. Vadoids show development of fine cortical laminae around spherulites and radial needles. Microfabric of speleothem-like crusts suggest precipitation of finer crystallites and their subsequent transformation to a coarser fabric. Rhombic, needle and spike-like cements and neomorphic spar (inverted from aragonite) are developed in a vadose setting. Aragonite to calcite inversion is supported by texture-chemistry variance. The tufas have been formed in three depositional environments (I) waterfall environment, (2) slope environment and (3) river channel margin environment.

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“…Macroscale deposits include bacterial shrubs ( Chafetz and Folk 1984), which are restricted to harsh hot spring deposits and which comprise bacterial stromatolites, bacterial pisoids, etc. (Folk and Chafetz 1983;Chafetz and Meredith 1983). Between the macroscale and microscale deposits are silt-to sand-sized equidimensional grains, commonly referred to as peloids, which have been reported from modern and ancient reef deposits (Chafetz 1986), deep water carbonate mud mounds (Monty 1995;Pratt 1995) stromatolites and thrombolites, as well as comprising a significant constituent in travertine accumulations (Chafetz and Folk 1984).…”

Section: Introductionmentioning

confidence: 98%

Bacterially Induced Microscale and Nanoscale Carbonate Precipitates

Folk

Chafetz

2000

Microbial Sediments

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Abstract. Bacteria are able to form carbonate rocks and minerals at all scales, from deposits many meters thick, to distinctive shrubs, to minute crystal forms. They are particularly common in peloids, stromatolites, and hot -water travertines. The peculiar crystal morphologies they produce can be duplicated in the laboratory. Nanobacteria are much smaller forms, spheroids 0.03 -0 .1 flm in diameter. A quantitative census of nanobacterial bodies in limestones from Holocene to Proterozoic, and in micrite vs ooids vs sparry calcite show that the abundance is enormously variable. In a 4 flm 2 area, most samples studied contain between one and 16 bacterial bodies; the median value is about four. Bacteria are significant producers of carbonate deposits.

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Recent Travertine Pisoliths (Pisoids) from Southeastern Idaho, U.S.A.

Cited by 29 publications

References 1 publication

Evidence of microbiologic activity in modern travertines: Sicakcermik geothermal field, central Turkey

Evidence of microbiologic activity in modern travertines: Sicakcermik geothermal field, central Turkey

Sedimentology of holocene tufa carbonates in Orissa State, India

Bacterially Induced Microscale and Nanoscale Carbonate Precipitates

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