Global controls on phosphatization of fossils during the toarcian oceanic anoxic event.

Autor: Sinha S; Department of Geological Sciences, The University of Texas at Austin, 2275 Speedway, Austin, TX, 78712, USA. sinjini@utexas.edu., Muscente AD; Department of Geological Sciences, The University of Texas at Austin, 2275 Speedway, Austin, TX, 78712, USA.; Department of Geology, Cornell College, 600 First Street SW, Mount Vernon, Iowa, 52314, USA., Schiffbauer JD; Department of Geological Sciences, University of Missouri, 101 Geological Sciences Building, Columbia, MO, 65211, USA.; X-Ray Microanalysis Core Facility, University of Missouri, 1 Geological Sciences Building, Columbia, MO, 65211, USA., Williams M; Bath Royal Literary and Scientific Institution, 16-18 Queen Square, Bath, BA1 2HN, UK., Schweigert G; Staatliches Museum für Naturkunde, Rosenstein 1, 70191, Stuttgart, Germany., Martindale RC; Department of Geological Sciences, The University of Texas at Austin, 2275 Speedway, Austin, TX, 78712, USA.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2021 Dec 16; Vol. 11 (1), pp. 24087. Date of Electronic Publication: 2021 Dec 16.
DOI: 10.1038/s41598-021-03482-7
Abstrakt: Konservat-Lagerstätten-deposits with exceptionally preserved fossils-vary in abundance across geographic and stratigraphic space due to paleoenvironmental heterogeneity. While oceanic anoxic events (OAEs) may have promoted preservation of marine lagerstätten, the environmental controls on their taphonomy remain unclear. Here, we provide new data on the mineralization of fossils in three Lower Jurassic Lagerstätten-Strawberry Bank (UK), Ya Ha Tinda (Canada), and Posidonia Shale (Germany) -and test the hypothesis that they were preserved under similar conditions. Biostratigraphy indicates that all three Lagerstätten were deposited during the Toarcian OAE (TOAE), and scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) show that each deposit contains a variety of taxa preserved as phosphatized skeletons and tissues. Thus, despite their geographic and paleoenvironmental differences, all of these Lagerstätten were deposited in settings conducive to phosphatization, indicating that the TOAE fostered exceptional preservation in marine settings around the world. Phosphatization may have been fueled by phosphate delivery from climatically-driven sea level change and continental weathering, with anoxic basins acting as phosphorus traps.
(© 2021. The Author(s).)
Databáze: MEDLINE
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