Constraining the formation of authigenic carbonates in a seepage-affected cold-water coral mound by lipid biomarkers.
Gulf of Cadiz
authigenic carbonates
cold-water coral mounds
cold-water corals
lipid biomarkers
sulphate methane transition zone
Journal
Geobiology
ISSN: 1472-4669
Titre abrégé: Geobiology
Pays: England
ID NLM: 101185472
Informations de publication
Date de publication:
03 2020
03 2020
Historique:
received:
21
02
2019
revised:
20
09
2019
accepted:
05
11
2019
pubmed:
6
2
2020
medline:
11
7
2020
entrez:
4
2
2020
Statut:
ppublish
Résumé
Cold-water coral (CWC) mounds are build-ups comprised of coral-dominated intervals alternating with a mixed carbonate-siliciclastic matrix. At some locations, CWC mounds are influenced by methane seepage, but the impact of methane on CWC mounds is poorly understood. To constrain the potential impact of methane on CWC mound growth, lipid biomarker investigations were combined with mineralogical and petrographic analyses to investigate the anaerobic oxidation of methane (AOM) and authigenic carbonate formation in sediment from a seep-affected CWC mound in the Gulf of Cadiz. The occurrence of AOM was confirmed by characteristic lipids found within a semi-lithified zone (SLZ) consisting of authigenic aragonite, high-magnesium calcite and calcium-excess dolomite. The formation of high-Mg calcite is attributed to AOM, acting as a lithifying agent. Aragonite is only a minor phase. Ca-excess dolomite in the SLZ and upper parts may be formed by organoclastic sulphate reduction, favouring precipitation by increased alkalinity. The AOM biomarkers in the SLZ include isoprenoid-based archaeal membrane lipids, such as abundant glycerol dibiphytanyl glycerol tetraethers (GDGTs) dominated by GDGT-2. The δ
Substances chimiques
Biomarkers
0
Carbonates
0
Lipids
0
Methane
OP0UW79H66
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
185-206Informations de copyright
© 2019 John Wiley & Sons Ltd.
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