Calibration of the δ18O paleothermometer for dolomite precipitated in microbial cultures and natural environments

Vásconcelos, Crisógono; McKenzie, Judith A.; Warthmann, R.; Bernasconi, Stefano M.

doi:10.1130/g20992.1

Cited by 321 publications

(205 citation statements)

References 19 publications

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“…Using the δ 18 O paleotemperature equation calibrated for dolomite (Vasconcelos et al, 2005), we can calculate the diagenetic formation temperature of the dolomite from 20-23 cm depth. With an average δ 18 O SMOW of 2.31 ‰ for the pore water and δ 18 O PDB of 3.14 ‰ for the dolomite, the calculated temperature for the early diagenesis is 21˚C, which corresponds well to an average value observed with field measurements at this depth below the sediment/water interface.…”

Section: Stable Isotope Datamentioning

confidence: 99%

Microbial Dolomite Precipitation under Aerobic Conditions: Results from Brejo do Espinho Lagoon (Brazil) and Culture Experiments

Sánchez‐Román

Vásconcelos

Warthmann

et al. 2009

Perspectives in Carbonate Geology

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Microbially mediated high Mg-calcite and dolomite precipitation occurs under oxic conditions in Brejo do Espinho lagoon, Brazil, within the upper 5 cm below the sediment/water interface. With burial to < 25 cm in the sediment sequence, early diagenesis associated with sulfate reducing bacterial activity transforms the mixed carbonate mineralogy to 100% dolomite, as the pore water becomes undersaturated with respect to calcite, while remaining supersaturated with respect to dolomite. Laboratory culture experiments using moderately halophilic aerobic bacteria (Virgibacillus marismortui and Marinobacter sp.) isolated from the uppermost part of the microbial mat in Brejo do Espinho succinctly demonstrate that microbially mediated dolomite precipitation can occur under ambient Earth's surface conditions in the presence of oxygen.These results add an additional metabolic process, aerobic respiration, to bacterial sulfate reduction and methanogenesis, which have previously been identified with dolomite formation. Furthermore, the formation of carbonate minerals with spherulitic structures in both the natural environment and laboratory culture experiments points to microbial involvement, as recognized in numerous other modern environments and ancient systems. This study suggests that previously recognized modern dolomiteforming environments, such as the supratidal areas of Andros Island, Bahamas with Recent dolomite crusts, should be revisited to evaluate the importance of aerobic respiration in dolomite precipitation.

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Section: Stable Isotope Datamentioning

confidence: 99%

Microbial Dolomite Precipitation under Aerobic Conditions: Results from Brejo do Espinho Lagoon (Brazil) and Culture Experiments

Sánchez‐Román

Vásconcelos

Warthmann

et al. 2009

Perspectives in Carbonate Geology

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“…This thermometer enables us to calculate calcite and dolomite precipitation temperatures independently of the isotopic composition of the water in which the carbonate crystallized (Ghosh et al, 2006;Guo et al, 2009;Dennis and Schrag, 2010). Clumped isotope-derived temperatures can be combined with ␦ 18 O carb to uniquely determine ␦ 18 O w through application of an appropriate carbonate-water oxygen isotope fractionation factor (Kim and O'Neil, 1997;Vasconcelos et al, 2005). The tool has been used for a range of applications including the study of primary and diagenetic processes in terrestrial and marine samples of a wide range of ages (Came et al, 2007;Affek et al, 2008;Dennis and Schrag, 2010;Eagle et al, 2010Eagle et al, , 2011Eagle et al, , 2013Passey et al, 2010;Tripati et al, 2010Tripati et al, , 2014Bristow et al, 2011;Ferry et al, 2011;Finnegan et al, 2011;Huntington et al, 2011;Keating-Bitonti et al, 2011;Loyd et al, 2012aLoyd et al, , 2013aLoyd et al, , 2014Passey and Henkes, 2012;Swanson et al, 2012;Dale et al, 2014).…”

Section: Figmentioning

confidence: 99%

“…The mineral-specific equations used are: O-temperature equations (Kim and O'Neil, 1997;Vasconcelos et al, 2005). The equations used are: 1000 ln ˛c alcite−water = 18.03 × 10 3 T −1 − 32.42…”

Section: Stable Isotope Analysis Standardization and Calculationsmentioning

confidence: 99%

Evolution of Neoproterozoic Wonoka–Shuram Anomaly-aged carbonates: Evidence from clumped isotope paleothermometry

Loyd

Corsetti

Eagle

et al. 2015

Precambrian Research

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a b s t r a c tThe Wonoka-Shuram Anomaly represents the largest negative carbon isotope excursion recognized in the geologic record and is associated with the emergence and diversification of metazoan life ca. 580 million years ago (Ma). The origin of the anomaly is highly debated, with interpretations ranging from primary to diagenetic, each having unique and potentially transformative implications for early life. Here, we apply carbonate clumped isotope thermometry to three sections expressing the anomaly in order to constrain mineral formation temperatures and thus directly calculate water oxygen isotope compositions (␦ 18 O w ) with which carbonate minerals equilibrated. With ␦ 18 O w known, it is possible to address previous hypotheses for the origin of the anomaly. In each section, precipitation temperatures correlate positively with reconstructed ␦ 18 O w . Previous hypotheses, based on the covariance of ␦ 18 O carb vs. ␦ 13 C carb (uncorrected for temperature effects), suggested a meteoric diagenetic origin for the anomaly. However, reconstructed ␦ 18 O w values do not covary with carbon isotope compositions (␦ 13 C carb ) within anomaly facies. Rather, the oxygen isotope and temperature data are consistent with carbonate recrystallization and equilibration under increasingly rock-buffered conditions. Based on simple modeling and comparison to modern formation fluids, recrystallization may have occurred in an environment far removed from the initial depositional or early diagenetic regime. In addition, although clumped isotope temperatures vary significantly and reach elevated values consistent with burial diagenesis, it is unclear to what degree, if at all, carbon isotope values were reset during recrystallization. Ultimately, these new data indicate that Wonoka-Shuram-aged carbonates experienced equilibration with fluids under increasingly closedsystem conditions. The clumped isotope data do not provide a means to distinguish previous hypotheses outright, but provide additional context for the evaluation of geochemical signatures within these ancient carbonate rocks.

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“…The calcite/aragonite concretions are characterized by negative values can be diagnostic of precipitation in the methanogenic zone (e.g., Curtis and Coleman, 1986;Mozley and Wersin, 1992;Whiticar, 1999 (Kim and O'Neil, 1997), aragonite (Kim et al, 2007), dolomite (Vasconcelos et al, 2005) and siderite (Fernandez et al, 2016) precipitated in isotopic equilibrium with seawater are expected to be of 1.5‰, 2.2‰, 4.5‰ and 5.6‰ (V-PDB), respectively.…”

Section: Isotopic Composition Of Carbonates and Origin Of Mineralizinmentioning

confidence: 99%

Authigenic minerals from the Paola Ridge (southern Tyrrhenian Sea): Evidences of episodic methane seepage

Franchi

Rovere

Gamberi

et al. 2017

Marine and Petroleum Geology

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a b s t r a c tPaola Ridge, along the NW Calabrian margin (southern Tyrrhenian Sea), is one of the few reported deep sea sites of precipitation of authigenic carbonates in the Tyrrhenian Sea. Here, the changing composition of the seeping fluids and the dynamic nature of the seepage induced the precipitation of pyrite, siderite and other carbonate phases. The occurrence of this array of authigenic precipitates is thought to be related to fluctuation of the sulfate-methane transition zone (SMTZ).Concretions of authigenic minerals formed in the near sub-bottom sediments of the Paola Ridge were investigated for their geochemical and isotopic composition. These concretions were collected in an area characterized by the presence of two alleged mud volcanoes and three mud diapirs. The mud diapirs are dotted by pockmarks and dissected by normal faults, and are known for having been a site of fluid seepage for at least the past 40 kyrs. Present-day venting activity occurs alongside the two alleged mud volcanoes and is dominated by CO 2 -rich discharging fluids. This discover led us to question the hypothesis of the mud volcanoes and investigate the origin of the fluids in each different domed structure of the study area.In this study, we used stable isotopes (carbon and oxygen) of carbonates coupled with rare earth element (REE) composition of different carbonate and non-carbonate phases for tracing fluid composition and early diagenesis of authigenic precipitates. The analyses on authigenic precipitates were coupled with chemical investigation of venting gas and sea-water.Authigenic calcite/aragonite concretions, from surficial sediments on diapiric structures, have depleted values. The siderite REE pattern shows consistent LREE (light REE) fractionation, MREE (medium REE) enrichment and positive Gd and La anomalies. As shown by the REE distribution, the 13 C-depleted composition and their association with chemosymbiotic fauna, calcite/aragonite precipitated at time of moderate to high methane flux close to the seafloor, under the influence of bottom seawater. Authigenic siderite, on the other hand, formed in the subseafloor, during periods of lower gas discharges under prolonged anoxic conditions within sediments in equilibrium with 13 C-rich dissolved inorganic carbon (DIC) and 18 O-rich water, likely related to methanogenesis and intermittent venting of deep-sourced CO 2 .

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Calibration of the δ18O paleothermometer for dolomite precipitated in microbial cultures and natural environments

Cited by 321 publications

References 19 publications

Microbial Dolomite Precipitation under Aerobic Conditions: Results from Brejo do Espinho Lagoon (Brazil) and Culture Experiments

Microbial Dolomite Precipitation under Aerobic Conditions: Results from Brejo do Espinho Lagoon (Brazil) and Culture Experiments

Evolution of Neoproterozoic Wonoka–Shuram Anomaly-aged carbonates: Evidence from clumped isotope paleothermometry

Authigenic minerals from the Paola Ridge (southern Tyrrhenian Sea): Evidences of episodic methane seepage

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