Journal article
Trace and rare earth element compositions of Silurian conodonts from the Vesiku Bone Bed: Histological and palaeoenvironmental implications
Palaeogeography, palaeoclimatology, palaeoecology, Vol.549, p.109449
07/01/2020
DOI: 10.1016/j.palaeo.2019.109449
Abstract
In-situ minor, trace and rare earth element (REE) compositions have been measured in conodonts from the lower Silurian Vesiku Bone Bed (Estonia), with the aim to visualize and to quantify conodont apatite elemental geochemistry, to evaluate compositional differences between conodont histologies, and to evaluate the use of conodont chemistry as a palaeobiological or palaeoenvironmental proxy. Tissue-selective analyses of minor, trace and rare earth element compositions of albid, hyaline, and basal tissues demonstrated significant chemical offsets among these histologies. The albid tissue had the lowest REE and trace element concentrations, suggesting crystallinity-determined better resilience to diagenetic alteration as documented in previous studies. Conversely, the basal tissue had highest concentrations of REEs and many trace elements, except for Sr that showed an opposite trend. The higher concentrations in albid and hyaline tissues supports the in-vivo Sr incorporation by conodont crown. Nonetheless, the obtained SN-normalized REE patterns were uniform through all the analyzed conodont taxa and different tissues, implying common diagenetic history. Absence of a Ce anomaly, and defined negative Eu anomaly indicate reducing conditions during early burial. These results validate current interpretations of the palaeoenvironmental conditions during the deposition of Vesiku Bone Bed and bolsters the use of REEs in Palaeozoic marine vertebrates as an important palaeoenvironmental proxy.
Details
- Title: Subtitle
- Trace and rare earth element compositions of Silurian conodonts from the Vesiku Bone Bed: Histological and palaeoenvironmental implications
- Creators
- Zivile Zigaite - Uppsala UniversityMartin Qvarnstrom - Uppsala UniversityAlyssa Bancroft - Indiana Geological and Water SurveyAlberto Perez-Huerta - University of AlabamaHenning Blom - Uppsala UniversityPer Erik Ahlberg - Uppsala University
- Resource Type
- Journal article
- Publication Details
- Palaeogeography, palaeoclimatology, palaeoecology, Vol.549, p.109449
- Publisher
- Elsevier
- DOI
- 10.1016/j.palaeo.2019.109449
- ISSN
- 0031-0182
- eISSN
- 1872-616X
- Number of pages
- 11
- Grant note
- VR 2014-4367 / Swedish Research Council Wallenberg Scholarship from the Knut and Alice Wallenberg Foundation
- Language
- English
- Date published
- 07/01/2020
- Academic Unit
- Earth and Environmental Sciences; Iowa Geological Survey; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984702729302771
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