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Strontium isotopes in Early Jurassic seawater

Strontium isotopes in Early Jurassic seawater,10.1016/0016-7037(94)90382-4,Geochimica Et Cosmochimica Acta,C JONES,H JENKYNS,S HESSELBO

Strontium isotopes in Early Jurassic seawater   (Citations: 62)
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Journal: Geochimica Et Cosmochimica Acta - GEOCHIM COSMOCHIM ACTA , vol. 58, no. 4, pp. 1285-1301, 1994
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    • ...Arthur et al. 1983; Veizer 1983b; Jones et al. 1994b)...
    • ...Brand and Veizer 1980; Veizer 1983a, 1983b; Jones et al. 1994b; McArthur 1994)...
    • ...Therefore, the results from the Portuguese oysters were compared to literature data of fossil oysters (Table 1). Manganese and iron contents in oysters are typically higher than in belemnites (Jones et al. 1994b)...
    • ...Jones et al. 1994b; van Geldern et al. 2006; Wierzbowski and Joachimski 2007)...
    • ...Consequently, diagenesis under oxidizing conditions can be widely excluded (Jones et al. 1994b)...
    • ...Jones et al. (1994a) Oysters \150 \30 Jones et al. (1994b) Belemnites \150 ‐...

    Simon Schneideret al. Sr-isotope stratigraphy of the Upper Jurassic of central Portugal (Lus...

    • ...The Pliensbachian–Toarcian boundary conveniently coincideswithaminimumintheSr-isotopecurve,whichwas defined originally for this time interval in the Yorkshire section of NE England [10,38]...
    • ...Strontiumisotope ratios from the highest belemnite for which we have data in the polymorphum Zone of the Cabo Carvoeiro Formation, at a stratigraphic height of 7.4 m in Fig. 3, suggests a correlation within the exaratum Subzone of the falciferum Zone in Yorkshire [10,27,38], but the uncertainty on the measurement permits correlation with horizons in the top of the tenuicostatum Zone and up to the top of the exaratum Subzone (Fig. 1). The ...
    • ...The Yorkshire dataset is also characterized by rather few samples from strata representing the peak of the negative excursion; only four samples have been collected, all from one locality (Port Mulgrave; from [10,27,38])...
    • ...[83] for modern Sepia, a distant relation tobelemnites).Someprocessesdoseemtoberuledoutby thedata.Previousstudieshavehighlightedthepotentialof fresh water input to the Laurasian seaway to affect the oxygen-isotopecomposition ofbelemnite calcite[12]and the variability of carbon-isotope values within belemnites from this region has also been noted [27,38] .H owever, anyfreshwaterinfluenceonbelemnitecalciteshouldhave lowered, rather than ...

    Stephen P. Hesselboet al. Carbon-isotope record of the Early Jurassic (Toarcian) Oceanic Anoxic ...

    • ...Diagenesis under oxidizing conditions is not thought to have taken place due to the high organic matter content of the sections [7]...

    T. R. Baileyet al. Paleoceanographic changes of the Late Pliensbachian–Early Toarcian int...

    • ...It has been suggested [10] that the sequence might be condensed around this level, or contain a hiatus...
    • ...Open squares = data from [10] normalised to NIST 987 of 0.710 248 by addition...
    • ...This assumptions thus underpin Mesozoic timescales [31] and derivatives such as the Jurassic 87Sr/86Sr curve ([2,10], Engkilde,...
    • ...The duration of the exaratum subzone (1.1 Myr) is longer than the 0.5 Myr previously thought [32,38,39], as is the Zone of H. falciferum, previously believed to be about 1 Myr in duration [10,32,37] and shown here to be about 1.4 Myr...

    J. M. McArthuret al. Strontium isotope pro¢le of the early Toarcian (Jurassic) oceanic anox...

    • ...Based on the analyses of whole carbonate rocks (Burke et al., 1982) and belemnites (Jones et al., 1994), the estimated 87Sr/86Sr ratios of Early...
    • ...Fig. 5. A cross-plot of 87Sr/86Sr against d18O for Gibraltar limestones and fine/medium dolomites, shown relative to the range of 87Sr/86Sr values from Gibraltar brachiopod shells (Bosence et al., 2000) and for Early Jurassic sea water (Jones et al., 1994), with indication of apparent trends resulting from diagenetic alteration...

    HAIRUO Q INGet al. Dolomitization by penesaline sea water in Early Jurassic peritidal pla...

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