Controls on authigenic mineralization in experimental Ediacara-style preservation.

التفاصيل البيبلوغرافية
العنوان:	Controls on authigenic mineralization in experimental Ediacara-style preservation.
المؤلفون:	Slagter S; Department of Earth & Planetary Sciences, Yale University, New Haven, Connecticut, USA.; Instituto de Ciencias de la Ingeniería, Universidad de O'Higgins, Rancagua, Chile., Konhauser KO; Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada., Briggs DEG; Department of Earth & Planetary Sciences, Yale University, New Haven, Connecticut, USA., Tarhan LG; Department of Earth & Planetary Sciences, Yale University, New Haven, Connecticut, USA.
المصدر:	Geobiology [Geobiology] 2024 Jul-Aug; Vol. 22 (4), pp. e12615.
نوع المنشور:	Journal Article
اللغة:	English
بيانات الدورية:	Publisher: Wiley Country of Publication: England NLM ID: 101185472 Publication Model: Print Cited Medium: Internet ISSN: 1472-4669 (Electronic) Linking ISSN: 14724669 NLM ISO Abbreviation: Geobiology Subsets: MEDLINE
أسماء مطبوعة:	Original Publication: Oxford, UK : Wiley, 2003-
مواضيع طبية MeSH:	Geologic Sediments/chemistry , Fossils , Cyanobacteria*/metabolism, Animals ; Invertebrates ; Microalgae ; Seawater/chemistry ; Silicon Dioxide/chemistry ; Ferric Compounds/metabolism
مستخلص:	The earliest evidence of complex macroscopic life on Earth is preserved in Ediacaran-aged siliciclastic deposits as three-dimensional casts and molds, known as Ediacara-style preservation. The mechanisms that led to this extraordinary preservation of soft-bodied organisms in fine- to medium-grained sandstones have been extensively debated. Ediacara-style fossilization is recorded in a variety of sedimentary facies characterized by clean quartzose sandstones (as in the eponymous Ediacara Member) as well as less compositionally mature, clay-rich sandstones and heterolithic siliciclastic deposits. To investigate this preservational process, we conducted experiments using different mineral substrates (quartzose sand, kaolinite, and iron oxides), a variety of soft-bodied organisms (microalgae, cyanobacteria, marine invertebrates), and a range of estimates for Ediacaran seawater dissolved silica (DSi) levels (0.5-2.0 mM). These experiments collectively yielded extensive amorphous silica and authigenic clay coatings on the surfaces of organisms and in intergranular pore spaces surrounding organic substrates. This was accompanied by a progressive drawdown of the DSi concentration of the experimental solutions. These results provide evidence that soft tissues can be rapidly preserved by silicate minerals precipitated under variable substrate compositions and a wide range of predicted scenarios for Ediacaran seawater DSi concentrations. These observations suggest plausible mechanisms explaining how interactions between sediments, organic substrates, and seawater DSi played a significant role in the fossilization of the first complex ecosystems on Earth. (© 2024 John Wiley & Sons Ltd.)
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معلومات مُعتمدة:	Natural Sciences and Engineering Research Council of Canada; American Chemical Society Petroleum Research Fund; Institute for Biospheric Studies, Yale University; United States NASA NASA
فهرسة مساهمة:	Keywords: Ediacara Biota; clays; experiments; fossilization; silica cycling
المشرفين على المادة:	7631-86-9 (Silicon Dioxide) 0 (Ferric Compounds) 1K09F3G675 (ferric oxide)
تواريخ الأحداث:	Date Created: 20240816 Date Completed: 20240816 Latest Revision: 20240816
رمز التحديث:	20240816
DOI:	10.1111/gbi.12615
PMID:	39149974
قاعدة البيانات:	MEDLINE

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تدمد:	1472-4669
DOI:	10.1111/gbi.12615