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Palaeoenvironments revealed by rare-earth element systematics in vertebrate bioapatite from the Lower Devonian of Svalbard
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.ORCID iD: 0000-0001-5209-5767
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology. Univ Lille 1, CNRS UMR8217, Lab Geosyst, F-59655 Villeneuve Dascq, France.
Univ Alabama, Dept Geol Sci, 2018 Bevill Bldg, Tuscaloosa, AL 35487 USA.
Dept Earth Sci, Nat Hist Museum, Cromwell Rd, London SW7 5BD, England.
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2016 (English)In: Canadian journal of earth sciences (Print), ISSN 0008-4077, E-ISSN 1480-3313, Vol. 53, no 8, 788-794 p.Article in journal (Refereed) Published
Abstract [en]

In situ rare-earth element (REE) compositions have been measured in early vertebrate microremains from the Lower Devonian basin of Andree Land (Svalbard), with the aim of obtaining information about their early depositional environment and potential reworking. Vertebrate microremains with different histology were used for the analyses, sourced from two different localities of marginal marine to freshwater sediments from geographically distant parts of the Grey Hoek Formation (Skamdalen and Tavlefjellet members). We selected thelodont and undescribed ? chondrichthyan scales, which allowed us to define potential taxonomic, histological, and taphonomic variables of the REE uptake. Results showed REE concentrations to be relatively uniform within the scales of each taxon, but apparent discrepancies were visible between the studied localities and separate taxa. The compilation of REE abundance patterns as well as REE ratios have revealed that thelodont and ? chondrichthyan originating from the same locality must have had different burial and early diagenetic histories. The shapes of the REE profiles, together with the presence and absence of the Eu and Ce anomalies, equally suggested different depositional and diagenetic environments for these two sympatric taxa resulting from either stratigraphical or long-distance reworking. The REE concentrations appear to have visible differences between separate dental tissues, particularly between enameloid and dentine of thelodonts, emphasizing the importance of in situ measurements in microfossil biomineral geochemistry.

Place, publisher, year, edition, pages
2016. Vol. 53, no 8, 788-794 p.
National Category
Geosciences, Multidisciplinary
URN: urn:nbn:se:uu:diva-284236DOI: 10.1139/cjes-2015-0206ISI: 000380910300006OAI: oai:DiVA.org:uu-284236DiVA: diva2:920054
Available from: 2016-04-15 Created: 2016-04-15 Last updated: 2016-10-05Bibliographically approved

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Zigaite, ZivileAhlberg, Per
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