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Formation of green rust and elemental sulfur in an analogue for oxygenated ferro-euxinic transition zones of Precambrian oceans

Titelangaben

Koeksoy, E. ; Sundman, A. ; Byrne, James ; Lohmayer, Regina ; Planer-Friedrich, Britta ; Halevy, I. ; Konhauser, Kurt O. ; Kappler, Andreas:
Formation of green rust and elemental sulfur in an analogue for oxygenated ferro-euxinic transition zones of Precambrian oceans.
In: Geology. Bd. 47 (2019) Heft 3 . - S. 211-214.
ISSN 1943-2682
DOI: https://doi.org/10.1130/G45501.1

Abstract

For much of the Precambrian era, the bulk ocean was anoxic and iron(II)-rich (ferruginous) with the exception of late Archean shallow ocean oxygenation and the first development of temporally and spatially restricted sulfide-rich waters (euxinia) along productive continental margins, which prevailed throughout much of the remaining Precambrian. There is little detail pertaining to transition zones between ferruginous, euxinic and oxic seawater over the continental shelf that presumably played an important role in shaping the composition of the underlying sediment. Here we present spectroscopic data on the iron- and sulfur-mineralogy in the Arvadi Spring, a proposed analogue for such conditions. Our study reveals green rust, ferrihydrite and lepidocrocite as the main iron minerals. Since the reactivity of green rust differs from ferric hydroxides and Fe(II) sulfides, it is important to understand its role in the transfer of metals and nutrients from seawater to underlying sediments, if those sediments are to be used as chemical archives of paleo-seawater. We observed elemental sulfur as the dominant sulfur precipitate and found indications for its role in pyrite formation, implying S0 could have controlled Precambrian deposition of pyrite-poor or pyrite-rich sediments.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER149353
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Umweltgeochemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Umweltgeochemie > Professur Umweltgeochemie - Univ.-Prof. Dr. Britta Planer-Friedrich
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 25 Mär 2019 12:51
Letzte Änderung: 25 Mär 2019 12:51
URI: https://eref.uni-bayreuth.de/id/eprint/48081