13C–18O bonds in carbonate minerals: A new kind of paleothermometer

Ghosh, Prosenjit; Adkins, Jess F.; Affek, Hagit P.; Balta, Brian; Guo, Weifu; Schauble, E. A.; Schrag, D. P.; Eiler, John M.

doi:10.1016/j.gca.2005.11.014

Cited by 752 publications

(1,070 citation statements)

References 35 publications

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“…The scale was based on the measurement of CO 2 heated to 1000°C to reach a nearly stochastic distribution of all isotopologues, which represents the zero point of the Δ 47 scale (Huntington et al, 2009). With the measurement of heated gases of different bulk isotope compositions (i.e., of variable δ 13 C and δ 18 O), it was observed that there is a dependence of the measured Δ 47 on the bulk isotope composition of the gas measured (Ghosh, Adkins, et al, 2006; Huntington et al, 2009). While the cause of this dependence was unknown at the time, by using gases of different bulk isotope composition it was possible to determine a heated gas line that could be used for correction of this nonlinearity effect, which is still commonly used by many laboratories to correct for mass spectrometric artifacts (Daëron et al, 2016; Schauer et al, 2016).…”

Section: Nomenclature and Isotopic Scales For Clumped Isotopes In Carmentioning

confidence: 99%

“…While the cause of this dependence was unknown at the time, by using gases of different bulk isotope composition it was possible to determine a heated gas line that could be used for correction of this nonlinearity effect, which is still commonly used by many laboratories to correct for mass spectrometric artifacts (Daëron et al, 2016; Schauer et al, 2016). Following the nonlinearity correction, observed variations in the compression of the Δ 47 scale were corrected by using the intercept of the heated gas line and relating it to the original value observed by Ghosh, Adkins, et al (2006). This ratio was used to stretch the Δ 47 scale (Huntington et al, 2009; Schmid & Bernasconi, 2010).…”

Section: Nomenclature and Isotopic Scales For Clumped Isotopes In Carmentioning

confidence: 99%

“…If we consider that the temperature dependence of Δ 47 is about 0.0033‰/°C at temperatures below 50°C (Kele et al, 2015), these differences amount to differences of 5 to 10°C in calculated temperatures for the same sample measured in different laboratories. Such interlaboratory differences are even greater at higher temperatures as the temperature dependence of Δ 47 is a quadratic function of the form Δ 47 = a 10 6 / T 2 + b (Ghosh, Adkins, et al, 2006). This accuracy may be sufficient for some applications but needs to be significantly improved if, for example, different laboratories aim to reconstruct climate variations on the order of a few degrees.…”

Section: The Absolute Reference Framementioning

confidence: 99%

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Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate‐Based Standardization

Bernasconi

Müller

Bergmann

et al. 2018

Geochem Geophys Geosyst

213

380

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About a decade after its introduction, the field of carbonate clumped isotope thermometry is rapidly expanding because of the large number of possible applications and its potential to solve long‐standing questions in Earth Sciences. Major factors limiting the application of this method are the very high analytical precision required for meaningful interpretations, the relatively complex sample preparation procedures, and the mass spectrometric corrections needed. In this paper we first briefly review the evolution of the analytical and standardization procedures and discuss the major remaining sources of uncertainty. We propose that the use of carbonate standards to project the results to the carbon dioxide equilibrium scale can improve interlaboratory data comparability and help to solve long‐standing discrepancies between laboratories and temperature calibrations. The use of carbonates reduces uncertainties related to gas preparation and cleaning procedures and ensures equal treatment of samples and standards. We present a set of carbonate standards of diverse composition, discuss how they can be used to correct for mass spectrometric biases, and demonstrate that their use significantly improves the comparability among four laboratories. We propose that the use of these standards or of a similar set of carbonate standards will improve the comparability of data across laboratories.

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Section: Nomenclature and Isotopic Scales For Clumped Isotopes In Carmentioning

confidence: 99%

Section: Nomenclature and Isotopic Scales For Clumped Isotopes In Carmentioning

confidence: 99%

Section: The Absolute Reference Framementioning

confidence: 99%

See 1 more Smart Citation

Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate‐Based Standardization

Bernasconi

Müller

Bergmann

et al. 2018

Geochem Geophys Geosyst

213

380

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“…D 47 values were corrected for acid fractionation using an empirically derived acid fractionation offset of 0.092‰ (Henkes et al, 2013;Defliese et al, 2015), and are reported on the absolute reference frame (Dennis et al, 2011). D 47 values were converted to temperatures (see Supplementary Information) using a variety of calibrations, (Ghosh et al, 2006;Eagle et al, 2013;Zaarur et al, 2013;Tang et al, 2014;Defliese et al, 2015), which have been adjusted to a common acid fractionation reference frame (Defliese et al, 2015 Kim and O'Neil (1997).…”

Section: Stable Isotopic Analysis Of Lake Carbonatesmentioning

confidence: 99%

Evaporation induced 18O and 13C enrichment in lake systems: A global perspective on hydrologic balance effects

Horton

Defliese

Tripati

et al. 2016

Quaternary Science Reviews

137

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a b s t r a c tGrowing pressure on sustainable water resource allocation in the context of global development and rapid environmental change demands rigorous knowledge of how regional water cycles change through time. One of the most attractive and widely utilized approaches for gaining this knowledge is the analysis of lake carbonate stable isotopic compositions. However, endogenic carbonate archives are sensitive to a variety of natural processes and conditions leaving isotopic datasets largely underdetermined. As a consequence, isotopic researchers are often required to assume values for multiple parameters, including temperature of carbonate formation or lake water d 18 O, in order to interpret changes in hydrologic conditions. Here, we review and analyze a global compilation of 57 lacustrine dual carbon and oxygen stable isotope records with a topical focus on the effects of shifting hydrologic balance on endogenic carbonate isotopic compositions.Through integration of multiple large datasets we show that lake carbonate d 18 O values and the lake waters from which they are derived are often shifted by >þ10‰ relative to source waters discharging into the lake. The global pattern of d 18 O and d 13 C covariation observed in >70% of the records studied and in several evaporation experiments demonstrates that isotopic fractionations associated with lake water evaporation cause the heavy carbon and oxygen isotope enrichments observed in most lakes and lake carbonate records. Modeled endogenic calcite compositions in isotopic equilibrium with lake source waters further demonstrate that evaporation effects can be extreme even in lake records where d 18 O and d 13 C covariation is absent. Aridisol pedogenic carbonates show similar isotopic responses to evaporation, and the relevance of evaporative modification to paleoclimatic and paleotopographic research using endogenic carbonate proxies are discussed.Recent advances in stable isotope research techniques present unprecedented opportunities to overcome the underdetermined nature of stable isotopic data through integration of multiple isotopic proxies, including dual element 13 C-excess values and clumped isotope temperature estimates. We demonstrate the utility of applying these multi-proxy approaches to the interpretation of paleohydroclimatic conditions in ancient lake systems. Understanding past, present, and future hydroclimatic systems is a global imperative. Significant progress should be expected as these modern research techniques become more widely applied and integrated with traditional stable isotopic proxies.

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“…In order to explore the origin of the Wonoka-Shuram Anomaly, we use a new tool, the carbonate clumped isotope paleothermometer (Ghosh et al, 2006;Dennis and Schrag, 2010) to determine the temperature of mineral formation and therefore better characterize the rocks in which the anomaly is preserved. 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).…”

Section: Figmentioning

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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13C–18O bonds in carbonate minerals: A new kind of paleothermometer

Cited by 752 publications

References 35 publications

Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate‐Based Standardization

Reducing Uncertainties in Carbonate Clumped Isotope Analysis Through Consistent Carbonate‐Based Standardization

Evaporation induced 18O and 13C enrichment in lake systems: A global perspective on hydrologic balance effects

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

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