دورية أكاديمية
Highly Siderophile Elements and Coupled Fe-Os Isotope Signatures in the Temagami Iron Formation, Canada: Possible Signatures of Neoarchean Seawater Chemistry and Earth's Oxygenation History.
| العنوان: | Highly Siderophile Elements and Coupled Fe-Os Isotope Signatures in the Temagami Iron Formation, Canada: Possible Signatures of Neoarchean Seawater Chemistry and Earth's Oxygenation History. |
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| المؤلفون: | Schulz T; Department of Lithospheric Research, University of Vienna, Vienna, Austria.; Institute for Geology und Mineralogy, University of Cologne, Cologne, Germany., Viehmann S; Department of Geology, University of Vienna, Vienna, Austria., Hezel DC; Institute for Geology und Mineralogy, University of Cologne, Cologne, Germany., Koeberl C; Department of Lithospheric Research, University of Vienna, Vienna, Austria., Bau M; Department of Physics and Earth Sciences, Jacobs University Bremen, Bremen, Germany. |
| المصدر: | Astrobiology [Astrobiology] 2021 Aug; Vol. 21 (8), pp. 924-939. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: Mary Ann Liebert, Inc Country of Publication: United States NLM ID: 101088083 Publication Model: Print Cited Medium: Internet ISSN: 1557-8070 (Electronic) Linking ISSN: 15578070 NLM ISO Abbreviation: Astrobiology Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Larchmont, N.Y. : Mary Ann Liebert, Inc., c2001- |
| مواضيع طبية MeSH: | Geologic Sediments* , Iron*/analysis, Isotopes ; Oceans and Seas ; Seawater |
| مستخلص: | Banded iron formations (BIFs) were deposited before and concurrent with the Great Oxidation Event at ∼2.33 Ga. They provide useful archives that document the transformation of the Precambrian hydrosphere from anoxic to progressively oxygenated conditions. Their formation involves removal of oceanic Fe by either inorganic or biologically promoted Fe 2+ oxidation, or both. To evaluate depositional settings, elemental sources that affect seawater chemistry, and oxidation pathways, we present the first combined highly siderophile element (HSE) and Fe-Os isotope study for the ∼2.7 Ga Temagami BIF, Abitibi Greenstone Belt, Ontario (Canada). HSE abundances and 187 Os/ 188 Os ratios show no systematic variation between alternating magnetite and (meta)chert bands of the Temagami BIF. Whereas HSE concentrations mostly resemble modern crustal values, present-day 187 Os/ 188 Os ratios range from ∼0.17 to ∼10.8. Magnetite samples define a regression line corresponding to an age of 2661 ± 126 Ma. A chondrite-like 187 Os/ 188 Os initial value is in agreement with earlier studies on Neoarchean marine sediments and is thought to reflect seawater composition, which, unlike modern oceans, is dominated by mantle-like 187 Os inventory most likely derived from deep-sea hydrothermal vents. Our δ 56 Fe data vary from about +0.6‰ to +0.9‰ and define a sawtooth-like pattern between alternating magnetite and (meta)chert layers. Partial oxidation of hydrothermally sourced Fe(II) and a lack of microbially mediated dissimilatory iron reduction provide the most plausible explanation for the positive δ 56 Fe values. Notably, our δ 56 Fe data for Temagami are in accord with trends defined by literature results for other Algoma-type BIFs that were deposited throughout the Archean. |
| فهرسة مساهمة: | Keywords: Banded iron formation; Earth's oxygenation; Iron isotopes; Neoarchean; Re-Os isotopes; Temagami |
| المشرفين على المادة: | 0 (Isotopes) E1UOL152H7 (Iron) |
| تواريخ الأحداث: | Date Created: 20210818 Date Completed: 20211015 Latest Revision: 20211015 |
| رمز التحديث: | 20240628 |
| DOI: | 10.1089/ast.2020.2311 |
| PMID: | 34406808 |
| قاعدة البيانات: | MEDLINE |
| تدمد: | 1557-8070 |
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| DOI: | 10.1089/ast.2020.2311 |