Strontium isotope stratigraphy in the upper Cenomanian shallow-water carbonates of the southern Apennines: Short-term perturbations of marine 87Sr/86Sr during the oceanic anoxic event 2

Frijia, Gianluca; Parente, Mariano

doi:10.1016/j.palaeo.2008.01.003

Cited by 103 publications

(82 citation statements)

References 59 publications

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“…Lead isotope ratios ( 208 Pb/ 204 Pb initial ) shift towards values more similar to large igneous province signatures, starting 1.5 m below OAE2, an estimated 480 ka prior to OAE2 based upon sediment accumulation rates calculated from within the Bonarelli interval in Italy (Ohkouchi et al, 1999;Kuroda et al, 2007). Strontium isotopes shift towards less radiogenic values at least 600 ka prior to OAE2, again estimated by extrapolation of sediment accumulation rates from within OAE2 (Frijia and Parente, 2008;Ando et al, 2009). Osmium isotopes make an initial shift towards less radiogenic values starting~400 ka prior to OAE2.…”

Section: Implications For Ocean Anoxic Event 2 At the Cenomanianturonmentioning

confidence: 86%

High precision U–Pb zircon geochronology for Cenomanian Dakota Formation floras in Utah

Barclay

Rioux

Meyer

et al. 2015

Cretaceous Research

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Section: Implications For Ocean Anoxic Event 2 At the Cenomanianturonmentioning

confidence: 86%

High precision U–Pb zircon geochronology for Cenomanian Dakota Formation floras in Utah

Barclay

Rioux

Meyer

et al. 2015

Cretaceous Research

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“…Such fluctuations are mostly linked to widespread but nonuniform burial of vast amounts of OC (as reviewed in ref. 17) and enhanced continental weathering (18,19).…”

mentioning

confidence: 99%

“…to the ocean. Identification of the mechanisms behind such increased nutrient delivery has been a major topic of investigation (21), and three main mechanisms have been proposed: (i) hydrothermal activity (22,23,24), (ii) enhanced continental weathering (18,19), and (iii)…”

mentioning

confidence: 99%

Sulfur isotopes track the global extent and dynamics of euxinia during Cretaceous Oceanic Anoxic Event 2

Owens

Gill

Jenkyns

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

144

136

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The Mesozoic Era is characterized by numerous oceanic anoxic events (OAEs) that are diagnostically expressed by widespread marine organic-carbon burial and coeval carbon-isotope excursions. Here we present coupled high-resolution carbon-and sulfurisotope data from four European OAE 2 sections spanning the Cenomanian-Turonian boundary that show roughly parallel positive excursions. Significantly, however, the interval of peak magnitude for carbon isotopes precedes that of sulfur isotopes with an estimated offset of a few hundred thousand years. Based on geochemical box modeling of organic-carbon and pyrite burial, the sulfur-isotope excursion can be generated by transiently increasing the marine burial rate of pyrite precipitated under euxinic (i.e., anoxic and sulfidic) water-column conditions. To replicate the observed isotopic offset, the model requires that enhanced levels of organic-carbon and pyrite burial continued a few hundred thousand years after peak organic-carbon burial, but that their isotope records responded differently due to dramatically different residence times for dissolved inorganic carbon and sulfate in seawater. The significant inference is that euxinia persisted post-OAE, but with its global extent dwindling over this time period. The model further suggests that only ∼5% of the global seafloor area was overlain by euxinic bottom waters during OAE 2. Although this figure is ∼30× greater than the small euxinic fraction present today (∼0.15%), the result challenges previous suggestions that one of the best-documented OAEs was defined by globally pervasive euxinic deep waters. Our results place important controls instead on local conditions and point to the difficulty in sustaining wholeocean euxinia.carbonate-associated sulfur | geochemical modeling

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“…In particular it has been successfully applied for chronostratigraphic dating and correlation of Upper Cretaceous shallow-water carbonates (Steuber, 2003;Steuber et al, 2005;Frijia and Parente, 2008a;Schlüter et al, 2008;Vicedo et al, 2011;Steuber and Schlüter, 2012;Vicedo et al, 2013;Frijia et al, 2015), also in the southern Pyrenees (Boix et al, 2011;Caus et al, 2013;Albrich et al, 2014). In this paper we used SIS to constrain the chronostratigraphic age of the youngest marine deposits in the Upper Cretaceous Units of the south Pyrenean basin.…”

Section: Strontium Isotope Stratigraphymentioning

confidence: 99%

Constraining the age of the last marine sediments in the late Cretaceous of central south Pyrenees (NE Spain): Insights from larger benthic foraminifera and strontium isotope stratigraphy

Caus

Frijia

Parente

et al. 2016

Cretaceous Research

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Strontium isotope stratigraphy in the upper Cenomanian shallow-water carbonates of the southern Apennines: Short-term perturbations of marine 87Sr/86Sr during the oceanic anoxic event 2

Cited by 103 publications

References 59 publications

High precision U–Pb zircon geochronology for Cenomanian Dakota Formation floras in Utah

High precision U–Pb zircon geochronology for Cenomanian Dakota Formation floras in Utah

Sulfur isotopes track the global extent and dynamics of euxinia during Cretaceous Oceanic Anoxic Event 2

Constraining the age of the last marine sediments in the late Cretaceous of central south Pyrenees (NE Spain): Insights from larger benthic foraminifera and strontium isotope stratigraphy

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