Replacement of Aragonite by Quasi-Rhombohedral Dolomite in a Late Pleistocene Tufa Mound, Great Salt Lake, Utah, U.S.A.

Pedone, Vicki A.; Dickson, J. A. D.

doi:10.1306/041200701152

Cited by 26 publications

(23 citation statements)

References 36 publications

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“…Numerous authors have also found these to be the most common morphologies in the bacterial bioliths formed as end-members of the stages of crystalline growth [6,20,24,45]. Similar spherical dolomite structures have been identified in late Pleistocene sediments from the Great Salt Lake, UT [46]. As this is the environment from which H. trueperi was isolated, these structures are indications for the formation of ancient precipitate by microbial metabolism.…”

Section: Resultsmentioning

confidence: 63%

Biomineralization of carbonates by Halobacillus trueperi in solid and liquid media with different salinities

Rivadeneyra

Párraga

Delgado

et al. 2004

FEMS Microbiology Ecology

154

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We investigated the precipitation of carbonates by Halobacillus trueperi in both solid and liquid media at different salt concentrations and different magnesium/calcium ratios. H. trueperi precipitated at all assayed salt concentrations. When salt concentration increased, the quantity and the size of bioliths decreased and the time required increased. The precipitated minerals (determined by X-ray diffraction) were calcite, magnesium calcite and monohydrocalcite in variable proportions depending on the salinity and the physical state of the medium; the magnesium content of the magnesium calcites also varied with regard to the culture type. According to the saturation indices other minerals could also precipitate. Scanning electron microscopy showed that dominant morphologies of the bioliths were spherulitic with fibrous radiated interiors. We show that H. trueperi plays an active role in the precipitation of carbonates and we hypothesize about this process of biomineralization.

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Section: Resultsmentioning

confidence: 63%

Biomineralization of carbonates by Halobacillus trueperi in solid and liquid media with different salinities

Rivadeneyra

Párraga

Delgado

et al. 2004

FEMS Microbiology Ecology

154

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“…They have, in general, never been buried and (early) diagenetic processes have been carefully addressed in literature or are under investigation. Eardley (1938), Sandberg (1975), Currey and James (1982), Spencer et al (1984), Currey and Oviatt (1985), Pedone and Dickson (2000), Chidsey et al (2015), Bouton et al (2016aBouton et al ( , 2016b, Pace et al (2016), Lindsay et al (2017) Ries Crater lake (South Germany)…”

Section: Tablementioning

confidence: 99%

What do we really know about early diagenesis of non-marine carbonates?

Boever

Brasier

Foubert

et al. 2017

Sedimentary Geology

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Non-marine carbonate rocks including cave, spring, stream, calcrete and lacustrine-palustrine sediments, are susceptible to early diagenetic processes. These can profoundly alter the carbonate fabric and affect paleoclimatic proxies. This review integrates recent insights into diagenesis of non-marine carbonates and in particular the variety of early diagenetic processes, and presents a conceptual framework to address them. With ability to study at smaller and smaller scales, down to nanometers, one can now observe diagenesis taking place the moment initial precipitates have formed, and continuing thereafter. Diagenesis may affect whole rocks, but it typically starts in nano-and micro-environments. The potential for diagenetic alteration depends on the reactivity of the initial precipitate, commonly being metastable phases like vaterite, Ca-oxalates, hydrous Mg-carbonates and aragonite with regard to the ambient fluid. Furthermore, organic compounds commonly play a crucial role in hosting these early transformations. Processes like neomorphism (inversion and recrystallization), cementation and replacement generally result in an overall coarsening of the fabric and homogenization of the wide range of complex, primary microtextures. If early diagenetic modifications are completed in a short time span compared to the (annual to millennial) time scale of interest, then recorded paleoenvironmental signals and trends could still acceptably reflect original, depositional conditions. However, even compact, non-marine carbonate deposits may behave locally and temporarily as open systems to crystal-fluid exchange and overprinting of one or more geochemical proxies is not unexpected. Looking to the future, relatively few studies have examined the behaviour of promising geochemical records, such as clumped isotope thermometry and (non-conventional) stable isotopes, in well-constrained diagenetic settings. Ongoing and future in-vitro and in-situ experimental approaches will help to investigate and detangle sequences of intermediate, diagenetic products, processes and controls, and to quantify rates of early diagenesis, bridging a gap between nanoscale, molecular lab studies and the fossil field rock record of non-marine carbonates.

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“…Great Salt Lake, Utah; Pedone and Dickson, 2000). The rare calcium carbonate hydrate known as ikaite has also been found in tufa (Buchardt et al, 2000).…”

Section: Biology Chemistry Mineralogy and Petrologymentioning

confidence: 99%