Clumped isotope thermometry of carbonatites as an indicator of diagenetic alteration

Dennis, Kate J.; Schrag, Daniel P.

doi:10.1016/j.gca.2010.04.005

Cited by 272 publications

(335 citation statements)

References 35 publications

Supporting

Mentioning

296

Contrasting

Unclassified

Order By: Relevance

“…The new clumped isotope data are reported relative to the absolute reference frame (ARF) of Dennis et al (2011) and temperatures were calculated using the calibration established in Ghosh et al (2006) modified for application to the absolute reference frame (Dennis et al, 2011). The two most debated clumped isotopetemperature relationships proposed by Ghosh et al (2006) and Dennis and Schrag (2010) largely overlap for the temperature ranges pertaining to those reproduced in this study.…”

Section: Calculationsmentioning

confidence: 96%

Extensive, uplift-related and non-fault-controlled spar precipitation in the Permian Capitan Formation

Loyd

Dickson

Scholle

et al. 2013

Sedimentary Geology

View full text Add to dashboard Cite

a b s t r a c t a r t i c l e i n f oWith time, unlithified grains in sediments become cemented and eventually lithified to form sedimentary rocks. Sedimentary rocks of all ages, lithologies and depositional settings exhibit cements. The timing of cementation within a given sedimentary unit, however, is generally poorly constrained. The formation conditions of the youngest of cement generations are particularly difficult to characterize. Typically, traditional carbonate carbon (δ 13 C carb ) and oxygen (δ 18 O carb ) isotope analyses are used to characterize precipitation timing and environment. However, ambiguities associated with the interpretation of δ 18 O carb data lead to conflicting hypotheses. The Permian Capitan Formation is one of the most widely studied carbonate sequences and contains extensive calcite cements that have been interpreted to form across a range of diagenetic environments through δ 18 O carb analyses. Here, we present new and previously reported clumped isotope data from calcite spars of Capitan fore-reef slope and equivalent shelf facies (Tansill Formation) in order to constrain mineralization temperatures, provide previously unattainable information concerning precipitation environment, and explore the spatial extent of precipitation events. Spar precipitation temperatures range from~30 to 75°C and show positive correlation with reconstructed pore water δ 18 O values, indicating rock-buffered behavior. Evaluation of the data using a simple water-rock model indicates that the fluid(s) involved in diagenesis must have had a significant meteoric component, exhibiting fluid δ 18 O values approaching −12‰ (VSMOW). These new data along with previously reported outcrop and core relationships indicate that spar precipitation occurred well after deposition of the Capitan Formation and likely during Tertiary uplift when fluids with such light isotopic signatures would have infiltrated the basin, and not during burial as generally assumed. The meteoric fluids responsible for spar precipitation may have been delivered locally through fracture networks, but also penetrated less fractured facies and produced extensive spar cements.

show abstract

Section: Calculationsmentioning

confidence: 96%

Extensive, uplift-related and non-fault-controlled spar precipitation in the Permian Capitan Formation

Loyd

Dickson

Scholle

et al. 2013

Sedimentary Geology

View full text Add to dashboard Cite

show abstract

“…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%

“…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).…”

Section: Figmentioning

confidence: 99%

“…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%

“…In addition to non-temperature effects, it is important to discuss the potential for solid-state reordering to alter 47 values without bulk recrystallization (Dennis and Schrag, 2010;Passey and Henkes, 2012;Henkes et al, 2014). Solid-state reordering is a temperatureand time-dependent phenomena that may influence the clumped isotope signature without changing other carbonate geochemical signatures, rendering a difference in the signal inheritance timing.…”

Section: Addressing Overprinting and Non-temperature Related Effectsmentioning

confidence: 99%

See 2 more Smart Citations

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

Loyd

Corsetti

Eagle

et al. 2015

Precambrian Research

View full text Add to dashboard Cite

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.

show abstract

Antarctic ice growth before and after the Eocene‐Oligocene transition: New estimates from clumped isotope paleothermometry

Petersen

Schrag

2015

Paleoceanography

View full text Add to dashboard Cite

Across the Eocene-Oligocene transition, the oxygen isotopic composition (δ 18 O) of benthic and planktonic foraminifera increased by over 1‰. This shift is thought to represent a combination of global cooling and the growth of a large ice sheet on the Antarctic continent. To determine the contribution of each of these factors to the total change in δ 18 O, we measured the clumped isotopic composition of planktonic foraminifera tests from Ocean Drilling Program Site 689 in the Southern Ocean. Near-surface temperatures were~12°C in the intervals 0-1.5 Myr before and 1-2 Myr after the major (Oi-1) transition, in agreement with estimates made using other proxies at nearby sites. Temperatures cooled by 0.4 ± 1.1°C between these intervals, indicating that the long-term change in δ 18 O seen in planktonic foraminifera at this site is predominantly due to changes in ice volume. A larger instantaneous cooling may have occurred during Oi-1 but is not captured in this study due to sampling resolution. The corresponding change in the isotopic composition of seawater (δ 18 O sw ) is 0.75 ± 0.23‰, which is within the range of previous estimates, and represents global ice growth equivalent to roughly~110-120% of the volume of the modern Antarctic ice sheet or~80-90 m of eustatic sea level change.Previous attempts at estimating the temperature change across the EOT using the Mg/Ca proxy were complicated by coincident changes in the carbonate saturation state of the oceans, which affects the uptake of Mg into biogenic calcite [Elderfield et al., 2006]. Initial measurements on benthic foraminifera suggested bottom water warming across the EOT, contrary to the cooling suggested by the δ 18 O record [

show abstract

Clumped isotope thermometry of carbonatites as an indicator of diagenetic alteration

Cited by 272 publications

References 35 publications

Extensive, uplift-related and non-fault-controlled spar precipitation in the Permian Capitan Formation

Extensive, uplift-related and non-fault-controlled spar precipitation in the Permian Capitan Formation

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

Antarctic ice growth before and after the Eocene‐Oligocene transition: New estimates from clumped isotope paleothermometry

Contact Info

Product

Resources

About