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Authigenic metastable iron sulfide minerals preserve microbial organic carbon in anoxic environments

Titelangaben

Picard, Aude ; Gartman, Amy ; Cosmidis, Julie ; Obst, Martin ; Vidoudez, Charles ; Clarke, David R. ; Girguis, Peter R.:
Authigenic metastable iron sulfide minerals preserve microbial organic carbon in anoxic environments.
In: Chemical Geology. Bd. 530 (2019) . - 119343.
ISSN 0009-2541
DOI: https://doi.org/10.1016/j.chemgeo.2019.119343

Abstract

The burial of organic carbon (OC) in sedimentary environments promotes long-term carbon sequestration and allows the release of oxygen in the atmosphere. OC preservation in sedimentary environments is commonly enhanced during transport and deposition on the seabed through the association with terrigenous minerals that can serve as physical protectants. Here, we propose an authigenic mechanism for the coupled preservation of labile OC and metastable iron sulfide minerals under anoxic conditions. Sulfate-reducing microorganisms (SRM) are ubiquitous in anoxic environments and produce the majority of free sulfide in marine sediments, leading to the formation of iron sulfide minerals in situ. Using high spatial resolution microscopy, spectroscopy and spectro-microscopy, we show that iron sulfide biominerals precipitated in the presence of SRM incorporate and adsorb organic molecules, leading to the formation of stable organo-mineral aggregates that could persist for years in anoxic environments. OC/iron sulfide assemblages consist of the metastable iron sulfide mineral phases mackinawite and/or greigite, along with labile organic compounds derived from new microbial biomass or from extracellular organic molecules released by SRM. Together these results underscore the role that a major group of anoxic microbes play in OC preservation and illustrate the value of the resulting authigenic metastable iron sulfide minerals mackinawite and greigite in protecting labile organic molecules from degradation over time.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER153675
Keywords: Biomineralization; Iron sulfide minerals; Iron; Sulfur; Organic carbon; Sulfate-reducing microorganisms
Institutionen der Universität: Forschungseinrichtungen
Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen
Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Heisenberg-Professur Experimentelle Biogeochemie > Heisenberg-Professur Experimentelle Biogeochemie - Univ.-Prof. Dr. Martin Obst
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Heisenberg-Professur Experimentelle Biogeochemie
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 27 Jan 2020 09:20
Letzte Änderung: 07 Sep 2023 11:11
URI: https://eref.uni-bayreuth.de/id/eprint/53774