87Sr/86Sr record of Permian seawater

Korte, Christoph; Jasper, Torsten; Kozur, Heinz W.; Veizer, Ján

doi:10.1016/j.palaeo.2006.03.047

Cited by 171 publications

(147 citation statements)

References 53 publications

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“…Note that some of our Permian samples were re-evaluated in a later publication and classified as stratigraphically not well defined due to i) their assignment to Chinese stages or ii) broad geological periods or iii) due to missing lithologic and biostratigraphic information (Korte et al, 2005). Nevertheless, the 87 Sr/ 86 Sr ratios of our Permian samples are also in accordance with samples that were classified as well preserved and biostratigraphically well defined (Korte et al, 2006;Korte et al, 2005) as is also the case with other samples from the same database of Veizer et al (1999) and the references therein (see Fig. A3 in the electronic annex).…”

Section: Introductionsupporting

confidence: 71%

The Phanerozoic δ88/86Sr record of seawater: New constraints on past changes in oceanic carbonate fluxes

Vollstaedt

Eisenhauer

Wallmann

et al. 2014

Geochimica et Cosmochimica Acta

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107

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The isotopic composition of Phanerozoic marine sediments provides important information about changes in seawater chemistry. In particular, the radiogenic strontium isotope ( 87 Sr/ 86 Sr) system is a powerful tool for constraining plate tectonic processes and their influence on atmospheric CO 2 concentrations. However, the 87 Sr/ 86 Sr isotope ratio of seawater is not sensitive to temporal changes in the marine strontium (Sr) output flux, which is primarily controlled by the burial of calcium carbonate (CaCO 3 ) at the ocean floor. The Sr budget of the Phanerozoic ocean, including the associated changes in the amount of CaCO 3 burial, is therefore only poorly constrained. Here, we present the first stable isotope record of Sr for Phanerozoic skeletal carbonates, and by inference for Phanerozoic seawater (δ 88/86 Sr sw ), which we find to be sensitive to imbalances in the Sr input and output fluxes. This δ 88/86 Sr sw record varies from ~0.25‰ to ~0.60‰ (vs. SRM987) with a mean of ~0.37‰. The fractionation factor between modern seawater and skeletal The oceanic net carbonate flux of Sr (F(Sr) carb ) varied between an output of -4.7x10 10 mol/Myr and an input of +2.3x10 10 mol/Myr with a mean of -1.6x10 10 mol/Myr.On time scales in excess of 100Myrs the F(Sr) carb is proposed to have been controlled by the relative importance of calcium carbonate precipitates during the "aragonite" and "calcite" sea episodes. On time scales less than 20Myrs the F(Sr) carb seems to be controlled by variable combinations of carbonate burial rate, shelf carbonate weathering and recrystallization, ocean acidification, and ocean anoxia. In particular, the Permian/Triassic transition is marked by a prominent positive δ 88/86 Sr sw -peak that reflects a significantly enhanced burial flux of Sr and carbonate, likely driven by bacterial sulfate reduction (BSR) and the related alkalinity production in deeper anoxic waters. We also argue that the residence time of Sr in the Phanerozoic ocean ranged from ~1Myrs to ~20Myrs.

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Section: Introductionsupporting

confidence: 71%

The Phanerozoic δ88/86Sr record of seawater: New constraints on past changes in oceanic carbonate fluxes

Vollstaedt

Eisenhauer

Wallmann

et al. 2014

Geochimica et Cosmochimica Acta

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107

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“…Sr isotope values for the whole Permian in a relatively coarse scale have been analysed using brachiopod shells and conodonts. The 87 Sr/ 86 Sr curve shows the lowest value 0.70685 in the late Capitanian followed by a gradual rise in the Lopingian to values of 0.70715 just below the PTB based on samples from Iran (Korte et al, 2003(Korte et al, , 2006. According to some recent detailed studies (Wang et al, , 2007Cao et al, 2009), the 87 Sr/ 86 Sr value of Bed 6c just below the GLB GSSP at the Penglaitan Section is 0.706712 , then gradually increases across the GLB (Figure 1).…”

Section: Sr/ 86 Sr Isotopementioning

confidence: 88%

High‐resolution Lopingian (Late Permian) timescale of South China

et al. 2010

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The Lopingian represents the last epoch of the Palaeozoic Era and is bracketed by two severe biotic mass extinctions associated with dramatic environmental changes. The Lopingian Epoch lasted about 7 millions years and was also bracketed by large volcanic eruptions with the Emeishan volcanics at the base and the Siberian traps at the top. Considerable data have accumulated recently and in this paper we attempt to summarize these findings in a high-resolution Lopingian (Late Permian) timescale that integrates currently available multiple biostratigraphic, isotope chemostratigraphic, geochronologic and magnetostratigraphic data. In South China at least 13 conodont zones, multiple polarity zones and large carbon isotope fluctuations in the Lopingian are recognized and provide the high-resolution calibration that is essential to study this Late Permian interval characterized by Earth's largest biotic extinction. We also present a global correlation chart for the marine Lopingian Series.

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“…Analysing only materials that are firmly tied by biostratigraphic schemes (e.g. conodonts: Korte et al 2003Korte et al , 2006) is currently the best way of ensuring acceptable age resolution and correlation between regions. For example, conodont biozonations of the Permian give an average age resolution of approximately 1.3 myr (Korte et al 2006;Henderson et al 2012).…”

Section: Uncertainties In Numerical Age Assignment and Correlationmentioning

confidence: 99%

“…conodonts) that were checked for sample preservation (e.g. Jurassic: Jones et al 1994;Triassic: Martin & Macdougall 1995;Korte et al 2003Korte et al , 2004Permian: Martin & Macdougall 1995;Korte et al 2004Korte et al , 2006Carboniferous: Bruckschen et al 1999;Devonian: Diener et al 1996;Ebneth et al 1997;Ordovician: Shields et al 2003). Such macrofossil remains are thought to be comparatively resistant to diagenesis (Veizer 1989;Blake et al 1997;Veizer et al 1999;Zazzo et al 2004), representing therefore the most robust available archives for past seawater 87 Sr/ 86 Sr (e.g.…”

mentioning

confidence: 99%

Permian strontium isotope stratigraphy

Korte

Ullmann

2016

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Abstract:The secular evolution of the Permian seawater 87 Sr/ 86 Sr ratios carries information about global tectonic processes, palaeoclimate and palaeoenvironments, such as occurred during the Early Permian deglaciation, the formation of Pangaea and the Permian-Triassic (P-Tr) mass extinction. Besides this application for discovering geological aspects of Earth history, the marine 87Sr/86Sr curve can also be used for robust correlations when other bio-, litho-and/or chemostratigraphic markers are inadequate. The accuracy of marine 87 Sr/ 86 Sr reconstructions, however, depends on high-quality age control of the reference data, and on sample preservation, both of which generally deteriorate with the age of the studied interval. The first-order Permian seawater 87 Sr/ 86 Sr trend shows a monotonous decline from approximately 0.7080 in the earliest Permian (Asselian) to approximately 0.7069 in the latest Guadalupian (Capitanian), followed by a steepening increase from the latest Guadalupian towards the P-Tr boundary (c. 0.7071-0.7072) and into the Early Triassic. Various higher-order changes in slope of the Permian 87 Sr/ 86 Sr curve are indicated, but cannot currently be verified owing to a lack of sample coverage and significant disagreement of published 87 Sr/ 86 Sr records.

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87Sr/86Sr record of Permian seawater

Cited by 171 publications

References 53 publications

The Phanerozoic δ88/86Sr record of seawater: New constraints on past changes in oceanic carbonate fluxes

The Phanerozoic δ88/86Sr record of seawater: New constraints on past changes in oceanic carbonate fluxes

High‐resolution Lopingian (Late Permian) timescale of South China

Permian strontium isotope stratigraphy

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