Conodont apatite δ18O values from a platform margin setting, Oklahoma, USA: Implications for initiation of Late Ordovician icehouse conditions

Rosenau, Nicholas A.; Herrmann, Achim D.; Leslie, Stephen A.

doi:10.1016/j.palaeo.2011.12.003

Cited by 48 publications

(24 citation statements)

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“…These studies have yielded somewhat contradictory interpretations. Two relatively high δ 18 O values measured near the base of the Katian in Oklahoma were cited as evidence of a brief cooling interval (Rosenau, Herrmann & Leslie, 2012), whereas results from Minnesota, Iowa and Kentucky suggest warming during the early Katian followed by stable conditions through the remainder of the Stage (Buggisch et al 2010). In addition, a low-resolution δ 18 O record spanning the entire Ordovician period suggests stable temperatures in the Katian (Trotter et al 2008) while variation in δ 18 O values purported to be correlated with sea level change in samples from Kentucky and Anticosti Island were interpreted to support the presence of glacial–interglacial cycles throughout the Katian (Elrick et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Testing the early Late Ordovician cool-water hypothesis with oxygen isotopes from conodont apatite

et al. 2017

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Latest Sandbian to early Katian sequences across Laurentia's epicontinental sea exhibit a transition from lithologies characterized as 'warm-water' carbonates to those characterized as 'coolwater'carbonates. This shift occurs across the regionally recognized M4/M5 sequence stratigraphic boundary and has been attributed to climatic cooling and glaciation, basin reorganization and upwelling of open ocean water, and/or increased water turbidity and terrigenous input associated with the Taconic tectophase. Documentation of oxygen isotopic trends across the M4/M5 and through bracketing strata provides a potential means of distinguishing among these alternative scenarios; however, oxygen isotopic records generated to date have failed to settle the debate. This lack of resolution is because δ 18 O records are open to multiple interpretations and potentially confounding factors related to local environmental conditions have not been tested by examining the critical interval in multiple areas and different depositional settings. To begin to address this shortcoming, we present new species-specific and mixed assemblage conodont δ 18 O values in samples spanning the M4/M5 boundary from the Upper Mississippi Valley, Alabama, and Virginia. The new results are combined with previous studies, providing a record of δ 18 O variability across SE Laurentia. The combined dataset allows us to test for regional trends at a resolution not previously available. Our results document a ∼1.5 ‰ decrease in values across Laurentia instead of increasing δ 18 O values across the M4/M5 as predicted in various 'cool-water' scenarios. In short, these results do not support a shift to 'cool-water' conditions as an explanation for changes in early Katian carbonates across the M4/M5.

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Section: Introductionmentioning

confidence: 99%

Testing the early Late Ordovician cool-water hypothesis with oxygen isotopes from conodont apatite

et al. 2017

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“…The data in Minnesota shows a nearly identical trend; data in the lower part of the section exhibits  18 O values between 19.5 to 21, but shifts to between 18 and 19.5 just before the GICE interval before shifting back towards and remaining at 20 (Buggisch et al, 2010). In the Oklahoma section, the oxygen data shifts from  18 O values of 19-20 towards values between 18-19.5; the leftward trend persists into the GICE (Rosenau et al, 2012). The data from this study helped define this trend in Alabama, where  18 O values were initially measured between 19-20.5…”

Section: Discussionmentioning

confidence: 80%

“…For the interval containing the GICE however, there are only two  18 O data points that do not exhibit a significant trend. Because the  13 C and (Rosenau et al, 2012). Figure 3 shows the three sampling sites at their present-day latitudes.…”

Section: Introductionmentioning

confidence: 99%

Testing the Late Ordovician Pre-Gice Warm Water Carbonate Hypothesis in Alabama

Euker¹,

Law²

2016

Geological Society of America Abstracts With Programs

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“…The δ 18 O records of carbonate fluorapatite conodont elements are increasingly utilized to estimate Paleozoic-Triassic seawater temperatures, and have led to global-scale hypotheses concerning biodiversification and mass extinction, reef evolution, climate change, and glacioeustasy (e.g., Trotter et al, 2008Trotter et al, , 2016Joachimski et al, 2009;Elrick et al, 2013;Rosenau et al, 2012). Despite these advances, little research has addressed variation of conodont δ 18 O in relation to conodont ecology and oceanic thermal configurations.…”

Section: Introductionmentioning

confidence: 99%

“…The extent of inter-species δ 18 O variability is known from two approaches. Analyses by thermal conversion-elemental analyzer-isotope ratio mass spectrometry (TC-EA-IRMS) of silver phosphate from conodont fluorapatite have demonstrated significant species δ 18 O offsets within a single 'conodont' sample (~1-1.5‰; e.g., Herrmann et al, 2010;Rosenau et al, 2012). Analyses by secondary ionization mass spectrometry (SIMS) identified δ 18 O offsets of up to 2‰ across shelf taxa from an Ordovician sample (Wheeley et al, 2012), and 0.9‰ variability between genera in a Devonian basin (Narkiewicz et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Paleoecologic and paleoceanographic interpretation of δ18O variability in Lower Ordovician conodont species

Wheeley

Jardine

Raine

et al. 2018

Geology

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Conodont δ 18 O is increasingly used to reconstruct Paleozoic-Triassic seawater temperature changes. Less attention has been paid to δ 18 O variation in time slices across paleoenvironments, within sample assemblages, or for reconstructing the thermal structure of Paleozoic oceans. Furthermore, there have been few independent tests of conodont ecologic models based on biofacies and lithofacies distributions. Here we present the first test of ecologic models for conodonts based on δ 18 O values of a Laurentian Lower Ordovician (Floian) shelf edge-upper slope assemblage in debrites of the proximal lower slope Shallow Bay Formation, Cow Head Group, western Newfoundland. Nine species yield a 1.6-1.8‰ intra-sample δ 18 O variability based on mixed tissue and white matter-only analyses, equivalent to an ~7-8 °C range. Linear mixed models demonstrate statistically significant differences between the δ 18 O of some species, supporting the interpretation that an isotopic and temperature gradient is preserved. By considering conodont δ 18 O in a geologic context, we propose an integrated paleoecologic and paleoceanographic model with species tiered pelagically through the water column, and confirm the utility of conodonts for water-mass characterization within Paleozoic oceans.

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Conodont apatite δ18O values from a platform margin setting, Oklahoma, USA: Implications for initiation of Late Ordovician icehouse conditions

Cited by 48 publications

References 40 publications

Testing the early Late Ordovician cool-water hypothesis with oxygen isotopes from conodont apatite

Testing the early Late Ordovician cool-water hypothesis with oxygen isotopes from conodont apatite

Testing the Late Ordovician Pre-Gice Warm Water Carbonate Hypothesis in Alabama

Paleoecologic and paleoceanographic interpretation of δ18O variability in Lower Ordovician conodont species

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