气候变化领域集成服务门户(CCPortal): Composition and structural features of two Permian parareptile (Deltavjatia vjatkensis; Kotelnich Site; Russia) bone fragments and their alteration during fossilisation

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DOI	10.1016/j.palaeo.2019.04.015
	Composition and structural features of two Permian parareptile (Deltavjatia vjatkensis; Kotelnich Site; Russia) bone fragments and their alteration during fossilisation
	Kiseleva D.; Shilovsky O.; Shagalov E.; Ryanskaya A.; Chervyakovskaya M.; Pankrushina E.; Cherednichenko N.
发表日期	2019
ISSN	0031-0182
起始页码	28
结束页码	42
卷号	526
英文摘要	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. © 2019 Elsevier B.V.
英文关键词	Bone fossilisation; Ce and Eu anomalies; Kotelnich vertebrate fossil location; Permian parareptiles; REE; WBC-like structures
语种	英语
scopus关键词	alkaline environment; bone; coastal zone; detection method; diagenesis; fossil record; fossilization; paleoecology; peatland; Permian; rare earth element; reptile; vertebrate; Kirov; Kotelnich; Russian Federation; Russian Federation; Vertebrata
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150949
作者单位	A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS, 15 Akademika Vonsovskogo street, Ekaterinburg, 620016, Russian Federation; Kazan Federal University, 18 Kremlyovskaya street, Kazan, Tatarstan Republic 420008, Russian Federation; Natural History Museum of Tatarstan, 12 Sheinkmana street, Kazan, Tatarstan Republic 420014, Russian Federation
推荐引用方式 GB/T 7714	Kiseleva D.,Shilovsky O.,Shagalov E.,et al. Composition and structural features of two Permian parareptile (Deltavjatia vjatkensis; Kotelnich Site; Russia) bone fragments and their alteration during fossilisation[J],2019,526.
APA	Kiseleva D..,Shilovsky O..,Shagalov E..,Ryanskaya A..,Chervyakovskaya M..,...&Cherednichenko N..(2019).Composition and structural features of two Permian parareptile (Deltavjatia vjatkensis; Kotelnich Site; Russia) bone fragments and their alteration during fossilisation.Palaeogeography, Palaeoclimatology, Palaeoecology,526.
MLA	Kiseleva D.,et al."Composition and structural features of two Permian parareptile (Deltavjatia vjatkensis; Kotelnich Site; Russia) bone fragments and their alteration during fossilisation".Palaeogeography, Palaeoclimatology, Palaeoecology 526(2019).