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Composition and structural features of two Permian parareptile (Deltavjatia vjatkensis, Kotelnich Site, Russia) bone fragments and their alteration during fossilisation

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dc.contributor.author Kiseleva D.
dc.contributor.author Shilovsky O.
dc.contributor.author Shagalov E.
dc.contributor.author Ryanskaya A.
dc.contributor.author Chervyakovskaya M.
dc.contributor.author Pankrushina E.
dc.contributor.author Cherednichenko N.
dc.date.accessioned 2020-01-21T20:32:47Z
dc.date.available 2020-01-21T20:32:47Z
dc.date.issued 2019
dc.identifier.issn 0031-0182
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/157384
dc.description.abstract © 2019 Elsevier B.V. The Kotelnich vertebrate fossil site, one of the richest of the Permian period, is characterised by the excellent preservation of fossil remains due to their burial in a silty anaerobic environment similar to modern peat bogs. The aim of the work is to carry out a comprehensive study of the composition and structure of bone fragments of the Permian parareptile Deltavjatia vjatkensis, as well as that of its embedding rocks, to support further paleoecological and fossilisation reconstructions. Fossil bones and their surrounding strata were investigated using optical and scanning electron microscopy, Raman spectroscopy, X-ray diffraction and inductively coupled plasma mass spectrometry (ICP-MS). The carbonate-rich composition of the sediment was found to favour the preservation of the bone apatite. The mineral phase of the bone tissue corresponds to fluorapatite. Organic matrix vibration bands arising on the Raman spectra correspond to C[sbnd]H vibrations of lipids and proteins and possibly cholesterol. The obtained data indicate a high degree of integrity of both bone mineral phase and its organic proteinaceous residue. White blood cell (WBC)-like structures were detected, which possibly could be interpreted as leukocytes. Elemental mapping of fossil bones was used to reveal element distribution features (uniform or with zones of apparent enrichment-depletion) and secondary mineralisation zones. Ca, P, Mg, Mn and S are uniformly distributed through the bone; conversely, elevated quantities of Fe are assigned to cracks and large pores formed as a consequence of the decomposition of organic materials. As compared to bone apatite, the authigenic calcite filling of bone porosities is significantly depleted in terms of microelements. The apatite rare earth element (REE) composition of bone tissue, which is inherited from seawater, can be used for paleoreconstructions of redox conditions and water composition. La/Sm ratios (0.4–0.5), high Y/Ho ratios, high uranium content and high La/Yb ratios (2–3) in the bone apatite indicate the absence of recrystallisation during the late stages of diagenesis. A positive cerium anomaly detected in the bones indicates the presence of an oxidising and possibly alkaline environment during the early stages of diagenesis in shallow coastal basin of the Kotelnich paleolocality. It is shown that 10 to 20% of REE in bone apatite is derived from seawater absorption (hydrogenous source), with the remainder having been derived from host rock (lithogenic) sources.
dc.relation.ispartofseries Palaeogeography, Palaeoclimatology, Palaeoecology
dc.subject Bone fossilisation
dc.subject Ce and Eu anomalies
dc.subject Kotelnich vertebrate fossil location
dc.subject Permian parareptiles
dc.subject REE
dc.subject WBC-like structures
dc.title Composition and structural features of two Permian parareptile (Deltavjatia vjatkensis, Kotelnich Site, Russia) bone fragments and their alteration during fossilisation
dc.type Article
dc.relation.ispartofseries-volume 526
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 28
dc.source.id SCOPUS00310182-2019-526-SID85067508522


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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