Strontium isotopic signatures in the enameloid and dentine of upper Cretaceous shark teeth from western Alabama: Paleoecologic and geochronologic implications

Becker, Martin A.; Seidemann, David E.; Chamberlain, John A.; Buhl, Dieter; Slattery, William

doi:10.1016/j.palaeo.2008.04.006

Cited by 20 publications

(22 citation statements)

References 30 publications

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“…Each part of the tooth (crown and root) was ground to a fine powder using a low‐speed cutting drill with bits ranging in size from 800 to 1000 µm. To isolate collagen, each powdered sample was demineralized in 1 mL of 4 M hydrochloric acid (HCl), which was then evaporated at 50°C for 12 h . Each sub‐sample was then rinsed with distilled water for neutralization and freeze‐dried.…”

Section: Methodsmentioning

confidence: 99%

“…Isotopic analyses in teeth of other taxa such as marine mammals have proven to be a useful tool that helps to establish trophic relationships . Shark teeth are composed of two types of calcified tissue: the crown covered by an enameloid matrix in the outer part and the osteodentine occurring in the inside and tooth root . Teeth occur in multiple rows and are continuously replaced during the life of the shark.…”

mentioning

confidence: 99%

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Trophic inferences of blue shark (Prionace glauca) in the Mexican Pacific from stable isotope analysis in teeth

Polo-Silva

Galván‐Magaña²,

Huertas

2012

Rapid Comm Mass Spectrometry

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Trophic inferences of blue shark (Prionace glauca) in the Mexican Pacific from stable isotope analysis in teeth

Polo-Silva

Galván‐Magaña²,

Huertas

2012

Rapid Comm Mass Spectrometry

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“…text and Table 3). Note that the teeth of ZT-2, ZT-6 and VII/1 are significantly different from the rest of the teeth in their layers (Table 2), and they are not included in the age calculations obtained (Ingram 1995;Vennemann and Hegner 1998;Martin and Scher 2004;Kocsis et al 2007Kocsis et al , 2009Becker et al 2008).…”

Section: Preservation Of the Fossilsmentioning

confidence: 99%

Paleoenvironmental conditions and strontium isotope stratigraphy in the Paleogene Gafsa Basin (Tunisia) deduced from geochemical analyses of phosphatic fossils

Kocsis

Ounis

Chaabani

et al. 2012

Int J Earth Sci (Geol Rundsch)

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Fossil shark teeth and coprolites from three major phosphorite occurrences in the Gafsa Basin (southwestern Tunisia) were investigated for their geochemical compositions to improve local stratigraphy and to better assess paleoenvironmental conditions. 87 Sr/ 86 Sr isotope ratios of shark teeth from the Early Maastrichtian El Haria Formation and from the Early Eocene Métlaoui s.s. Formation yielded Sr isotope ages of 68 ± 1 and 47.9 ± 1.3 Ma, respectively, which accord with the expected stratigraphic positions of these sediments. Conversely, shark teeth from the Paleocene-Eocene Chouabine Formation have large variation in Sr isotope ratios even within individual layers. After statistical treatment and then elimination of certain outlier samples, three age-models are proposed and discussed. The most reasonable solution includes three subsequent Sr ages of 61.8 ± 2.2 Ma, 57.2 ± 1.8 and 54.6 ± 1.6 for layer IX, layers VIII-V and layers IV-0, respectively. Three scenarios are discussed for explanation of the presence of the outliers: (1) diagenesis, (2) re-working and (3) locally controlled seawater Sr isotope ratio. The most plausible account for the higher 87 Sr/ 86 Sr ratios relative to the global ocean in some fossils is enhanced intrabasinal re-working due to low sea level. Conversely, the sample with lower 87 Sr/ 86 Sr than the global seawater may link to diagenesis or to seawater influenced by weathering of Late Cretaceous marine carbonates, which latter is supported by model calculation as well. The e Nd values of these fossils are very similar to those reported for Paleogene and Late Cretaceous Tethyan seawater and are compatible with the above interpretations. The relatively low oxygen isotope values in shark teeth from the topmost phosphate bed of the Chouabine Formation, together with the Sr isotope results, point toward recovering better connections with the open sea. These d 18 O data reflect elevated ambient temperature, which may link to the Early Eocene Climatic Optimum.

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“…The enamel contains substantial amounts of fluorapatite, which is composed of coarser crystals and is more stable than the carbonate hydroxyapatite found in bone tissue (Vennemann et al 2001;Trueman et al 2004;Becker et al 2008;Kohn 2008). As a result of this stable structure, the tooth enamel is less likely to recrystallize during fossilization, and resists uptake of REE from the environment in the way that the less-stable bone phosphates acquire REE from surrounding pore waters.…”

Section: Ree Profiles In Different Taxonomic Groupsmentioning

confidence: 99%

Rare Earth Element (Ree) Analysis of Vertebrate Fossils From the Upper Cretaceous Carbonate Marine Formations of Western and Central Alabama, Usa: Taphonomic and Paleoenvironmental Implications

Harrell¹,

Pérez‐Huerta²

2015

PALAIOS

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Strontium isotopic signatures in the enameloid and dentine of upper Cretaceous shark teeth from western Alabama: Paleoecologic and geochronologic implications

Cited by 20 publications

References 30 publications

Trophic inferences of blue shark (Prionace glauca) in the Mexican Pacific from stable isotope analysis in teeth

Trophic inferences of blue shark (Prionace glauca) in the Mexican Pacific from stable isotope analysis in teeth

Paleoenvironmental conditions and strontium isotope stratigraphy in the Paleogene Gafsa Basin (Tunisia) deduced from geochemical analyses of phosphatic fossils

Rare Earth Element (Ree) Analysis of Vertebrate Fossils From the Upper Cretaceous Carbonate Marine Formations of Western and Central Alabama, Usa: Taphonomic and Paleoenvironmental Implications

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