Cryogenic brines as diagenetic fluids: Reconstructing the diagenetic history of the Victoria Land Basin using clumped isotopes

Staudigel, Philip T.; Murray, Sean T.; Dunham, Daniel P.; Frank, Tracy D.; Fielding, Christopher R.; Swart, Peter K.

doi:10.1016/j.gca.2018.01.002

Cited by 48 publications

(51 citation statements)

References 74 publications

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“…However, based on published studies from our laboratory, neither of these appear to be evident. Our temperature-Δ 47 relationship (Staudigel et al, 2018) is similar to many of the recent relationships that have been published, and other studies (Müller et al, 2017;Weger et al, 2019) appear to give values consistent with other geological interpretations.…”

Section: Differences In Values Of the Eth Standardssupporting

confidence: 90%

Oxygen Isotopic Exchange Between CO₂ and Phosphoric Acid: Implications for the Measurement of Clumped Isotopes in Carbonates

Swart

Murray

Staudigel

et al. 2019

Geochem Geophys Geosyst

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Experiments have been conducted in which CO2 gases with varying C and O isotopic compositions and with stochastic and nonstochastic Δ47 values have been allowed to equilibrate with phosphoric acid of two concentrations in reaction vessels of varying dimensions at temperatures of 25 and 90 °C. Rates of 13C18O and 18O exchange between the CO2 and the phosphoric acid varied as a function of the length of exposure, volume of reaction vessel, acid strength, and difference of the initial Δ47 and δ18O values of the CO2 from theoretical equilibrium values. The Δ47 values were also altered by heated stainless steel surfaces such as those found within the Kiel device and other preparation systems. These results have been used to explain variations in the differences in the fractionation between 25 and 90 °C reported for calcite by different workers as well as differences in the slopes between temperature and Δ47 values produced by reacting samples at different temperatures (25 and 90 °C).

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Section: Differences In Values Of the Eth Standardssupporting

confidence: 90%

Oxygen Isotopic Exchange Between CO₂ and Phosphoric Acid: Implications for the Measurement of Clumped Isotopes in Carbonates

Swart

Murray

Staudigel

et al. 2019

Geochem Geophys Geosyst

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“…The ∆ 47 values of the modern control group bivalves fall within a narrow range between +0.70 and +0.67‰, which corresponds to a temperature range of 23° to 32°C when using the temperature-∆ 47 calibration generated using the same instrumentation (25). This temperature range is consistent with seasonal variation in the region (26).…”

Section: Discussionsupporting

confidence: 62%

“…Uncertainty corresponds to ±1 SD from replicate analyses. Inferred paleotemperatures were calculated from  47 values using the calibration from Staudigel et al(25). ARF, absolute reference frame; VPDB, Vienna PDB.…”

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confidence: 99%

Boiled or roasted? Bivalve cooking methods of early Puerto Ricans elucidated using clumped isotopes

et al. 2019

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Cooking technique reflects a combination of cultural and technological factors; here, we attempt to constrain bivalve cooking temperatures for a pre-Columbian Puerto Rican native population using carbonate clumped isotopes. Analyses of 24 bivalve specimens (Phacoides pectinatus) from a shell midden in Cabo Rojo, Puerto Rico, suggest that samples were heated up to 200°C, indicating that roasting rather than boiling may have been the preferred cooking technique. More than half of analyzed samples exhibited a distinct change from modern uncooked shells, possibly reflecting different cooking techniques or the use of a single method wherein shells are unevenly heated, such as when placed on a heated surface. Roasting bivalves would not necessitate the use of ceramic technologies, an observation concurrent with the absence of such artifacts at this site.

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“…Our new geochemical data from the englacial brine confirms previously published data that the Taylor Glacier subglacial brine is of marine origin that has been extensively altered by extended rock‐water interactions. Recent findings that show that hypersaline groundwater exists beneath much of Taylor Valley (Mikucki et al, ) and that cryogenic brines have been important diagenetic fluids in the Victoria Land Basin (Frank et al, ; Staudigel et al, ) make the understanding of the biogeochemistry and origin, distribution, and movement of these fluids important. Blood Falls is the only known surface manifestation of the recently detected extensive aquifers in the McMurdo Dry Valleys and provides a snapshot of deep groundwater conditions in Antarctica.…”

Section: Discussionmentioning

confidence: 99%

“…Journal of Geophysical Research: Biogeosciences and that cryogenic brines have been important diagenetic fluids in the Victoria Land Basin (Frank et al, 2010;Staudigel et al, 2018) make the understanding of the biogeochemistry and origin, distribution, and movement of these fluids important. Blood Falls is the only known surface manifestation of the recently detected extensive aquifers in the McMurdo Dry Valleys and provides a snapshot of deep groundwater conditions in Antarctica.…”

Section: 1029/2018jg004411mentioning

confidence: 99%

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

et al. 2019

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Blood Falls is a hypersaline, iron‐rich discharge at the terminus of the Taylor Glacier in the McMurdo Dry Valleys, Antarctica. In November 2014, brine in a conduit within the glacier was penetrated and sampled using clean‐entry techniques and a thermoelectric melting probe called the IceMole. We analyzed the englacial brine sample for filterable iron (fFe), total Fe, major cations and anions, nutrients, organic carbon, and perchlorate. In addition, aliquots were analyzed for minor and trace elements and isotopes including δD and δ18O of water, δ34S and δ18O of sulfate, 234U, 238U, δ11B, 87Sr/86Sr, and δ81Br. These measurements were made in order to (1) determine the source and geochemical evolution of the brine and (2) compare the chemistry of the brine to that of nearby hypersaline lake waters and previous supraglacially sampled collections of Blood Falls outflow that were interpreted as end‐member brines. The englacial brine had higher Cl− concentrations than the Blood Falls end‐member outflow; however, other constituents were similar. The isotope data indicate that the water in the brine is derived from glacier melt. The H4SiO4 concentrations and U and Sr isotope suggest a high degree of chemical weathering products. The brine has a low N:P ratio of ~7.2 with most of the dissolved inorganic nitrogen in the form of NH4+. Dissolved organic carbon concentrations are similar to end‐member outflow values. Our results provide strong evidence that the original source of solutes in the brine was ancient seawater, which has been modified with the addition of chemical weathering products.

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Cryogenic brines as diagenetic fluids: Reconstructing the diagenetic history of the Victoria Land Basin using clumped isotopes

Cited by 48 publications

References 74 publications

Oxygen Isotopic Exchange Between CO₂ and Phosphoric Acid: Implications for the Measurement of Clumped Isotopes in Carbonates

Oxygen Isotopic Exchange Between CO₂ and Phosphoric Acid: Implications for the Measurement of Clumped Isotopes in Carbonates

Boiled or roasted? Bivalve cooking methods of early Puerto Ricans elucidated using clumped isotopes

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

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Cryogenic brines as diagenetic fluids: Reconstructing the diagenetic history of the Victoria Land Basin using clumped isotopes

Cited by 48 publications

References 74 publications

Oxygen Isotopic Exchange Between CO2 and Phosphoric Acid: Implications for the Measurement of Clumped Isotopes in Carbonates

Oxygen Isotopic Exchange Between CO2 and Phosphoric Acid: Implications for the Measurement of Clumped Isotopes in Carbonates

Boiled or roasted? Bivalve cooking methods of early Puerto Ricans elucidated using clumped isotopes

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

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Oxygen Isotopic Exchange Between CO₂ and Phosphoric Acid: Implications for the Measurement of Clumped Isotopes in Carbonates

Oxygen Isotopic Exchange Between CO₂ and Phosphoric Acid: Implications for the Measurement of Clumped Isotopes in Carbonates