Large Carbonate Associated Sulfate isotopic variability between brachiopods, micrite, and other sedimentary components in Late Ordovician strata

Present, Theodore M.; Paris, Guillaume; Burke, Andrea; Fischer, Woodward W.; Adkins, Jess F.

doi:10.1016/j.epsl.2015.10.005

Cited by 93 publications

(107 citation statements)

References 45 publications

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“…The remaining carbonate powder was then pre‐cleaned of soluble sulphates by ultra‐sonicating in 10% NaCl and rinsing three times with ultra‐pure water (18·2 Ω cm resistivity), centrifuging and discarding the supernatant with a pipette between each rinse. Samples were then transferred to acid‐clean micro‐centrifuge vials, dissolved in trace metal‐clean 0·5 N hydrochloric acid, centrifuged and pipetted away from any insoluble residue (Present et al., ). Sulphate was purified from its cation matrix by anion exchange chromatography (Das et al., ; Paris et al., 2014a), after which its concentration was determined by ion chromatography using a Dionex ICS‐3000 system (Thermo Fisher Scientific) using three in‐house concentration standards to assess accuracy and precision, which were better than 0·5% (1 σ relative SD) (Paris et al., ; Present et al., ).…”

Section: Methodsmentioning

confidence: 99%

“…Carbonate‐associated sulphate in recent biogenic carbonate accurately preserves the δ 34 S of modern seawater (Burdett et al., ; Kampschulte et al., ; Paris et al., 2014b; Rennie et al., ) and well‐preserved biogenic carbonate, especially low‐magnesium calcite in brachiopods and belemnites, may robustly preserve the composition of ancient seawater (Kampschulte & Strauss, ; Gill et al., 2011a; Newton et al., ; Wu et al., ; Present et al., ). Unfortunately, such well‐preserved fossiliferous material is rare in the geological record and absent in Precambrian strata.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, CAS in bulk carbonate rock is an attractive proxy for reconstructing the isotopic composition of ancient seawater because carbonates are widely‐deposited in space and time in the rock record. Studies of CAS in bulk carbonate material have concluded that early diagenetic processes such as neomorphism, dolomitization and authigenic cementation may incorporate sulphate from diagenetically‐modified or non‐seawater fluids (Goldberg et al., ; Riccardi et al., ; Gill et al., ; Loyd et al., 2012a; Rennie & Turchyn, ; Baldermann et al., ; Present et al., ; Feng et al., ; Fichtner et al., ). Screening for the effect of such processes typically entails textural, trace metal, and carbon and oxygen isotope analyses associated with meteoric or burial diagenesis that may not correlate with sulphur isotope alteration (Goldberg et al., ; Gill et al., 2011a, 2011b; Yan et al., ; Fichtner et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Diagenetic controls on the isotopic composition of carbonate‐associated sulphate in the Permian Capitan Reef Complex, West Texas

et al. 2019

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Late Palaeozoic-age strata from the Capitan Reef in west Texas show faciesdependent heterogeneity in the sulphur isotopic composition of carbonateassociated sulphate, which is trace sulphate incorporated into carbonate minerals that is often used to reconstruct the sulphur isotopic composition of ancient seawater. However, diagenetic pore fluid processes may influence the sulphur isotopic composition of carbonate-associated sulphate. These processes variously modify the sulphur isotopic composition of incorporated sulphate from syndepositional seawater in shelf crest, outer shelf, shelf margin and slope depositional settings. This study used a new multicollector inductively-coupled plasma mass spectrometry technique to determine the sulphur isotopic composition of samples of individual depositional and diagenetic textures. Carbonate rocks representing peritidal facies in the Yates and Tansill formations preserve the sulphur isotopic composition of Guadalupian seawater sulphate despite alteration of the carbon and oxygen isotopic compositions by meteoric and dolomitizing diagenetic processes. However, sulphur isotopic data indicate that limestones deposited in reef and slope facies in the Capitan and Bell Canyon formations largely incorporate sulphate from anoxic marinephreatic pore fluids isotopically modified from seawater by microbial sulphate reduction, despite generally preserving the carbon and oxygen isotopic compositions of Permian seawater. Some early and all late meteoric calcite cements have carbonate-associated sulphate with a sulphur isotopic composition distinct from that of Permian seawater. Detailed petrographic and sedimentary context for carbonate-associated sulphate analyses will allow for improved reconstructions of ancient seawater composition and diagenetic conditions in ancient carbonate platforms. The results of this study indicate that carbonate rocks that diagenetically stabilize in high-energy environments without pore fluid sulphate gradients can provide a robust archive of ancient seawater's sulphur isotopic composition.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diagenetic controls on the isotopic composition of carbonate‐associated sulphate in the Permian Capitan Reef Complex, West Texas

et al. 2019

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“…Implementing a barite removal step would triple the amount of calcite needed. Additionally, standard cleaning methods do not attempt to chemically remove pyrite 6 , although in some cases microcrystalline pyrite can be oxidized during CAS extraction 7 . This is addressed by visually ensuring as much as possible that the samples do not contain pyrite, replacing all the oxidizing acids used (such as nitric acid) with non-oxidizing acids (such as hydrochloric acid), and dissolving samples in as weak an acid as possible.…”

Section: Foraminiferal Cleaningmentioning

confidence: 99%

Cenozoic record of δ34S in foraminiferal calcite implies an early Eocene shift to deep-ocean sulfide burial

et al. 2018

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“…Although there is controversy regarding the cause of the latest Ordovician d 38 S pyrite isotopic excursion (which is not matched by any significant change in calcite-associated S-isotope ratios), it is widely thought to have been driven by global processes of environmental change (e.g. Jones & Fike 2013;Present et al 2015) and may, thus, provide a useful set of data for correlation.…”

Section: Using Isotope Excursions and Lithological Markers In Quantitmentioning

confidence: 99%

A new approach to quantifying stratigraphical resolution: application to global stratotypes

Melchin

Sheets

Mitchell

et al. 2017

LET

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Horizon annealing (HA) provides a method to order all horizons in a chronostratigraphic data set, including marker beds and isotopic excursions, as well as horizons that lack exact local markers (such as taxon first appearances) and are, thus, constrained only by local stratigraphical order. Global stratotype section and point (GSSP) levels placed within an HA composite succession can be precisely correlated with levels in all other sections in the composite that span the same interval. We present two approaches to the quantitative assessment of the uncertainty or error in the placement of horizons within the composite section: a permutation method (jackknife analysis) and a sensitivity analysis (the relaxed fit curve). From jackknife analysis, we calculate a standard deviation (σ) of the variation in horizon placements and estimate the 95% confidence interval of the variation in horizon placement within the composite. We also directly assess the relative stability of event positions using the results of the jackknife. These approaches provide an objective method for assessing the relative strengths of GSSP candidates, in which we prefer those sections and horizons that are the most precisely controlled in the HA composite. Integration of biostratigraphical, chemostratigraphical and lithostratigraphical marker horizons into the HA process markedly improves levels of constraint within the composite compared to biostratigraphical data alone. In a temporally scaled composite, the 95% confidence intervals on horizon placements could be used to estimate temporal resolution. In our study, we estimate that the average temporal resolution is approximately 319 kyr, which approaches the range of that needed to test hypotheses of orbitally driven cyclicity.

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Large Carbonate Associated Sulfate isotopic variability between brachiopods, micrite, and other sedimentary components in Late Ordovician strata

Cited by 93 publications

References 45 publications

Diagenetic controls on the isotopic composition of carbonate‐associated sulphate in the Permian Capitan Reef Complex, West Texas

Diagenetic controls on the isotopic composition of carbonate‐associated sulphate in the Permian Capitan Reef Complex, West Texas

Cenozoic record of δ34S in foraminiferal calcite implies an early Eocene shift to deep-ocean sulfide burial

A new approach to quantifying stratigraphical resolution: application to global stratotypes

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