Distributions and carbon isotopic compositions of lipid biomarkers in authigenic carbonate crusts from the Nordic margin (Norwegian Sea)
International audience We investigated the distributions and δ 13 C values of lipid biomarkers in authigenic carbonate crusts from the Nordic margin (Norwegian Sea). Abundant, highly 13 C-depleted archaeal and bacterial biomarkers revealed that anaerobic oxidation of methane (AOM) is associated with...
Published in: | Organic Geochemistry |
---|---|
Main Authors: | , , , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2010
|
Subjects: | |
Online Access: | https://hal.science/hal-04113858 https://doi.org/10.1016/j.orggeochem.2010.03.012 |
Summary: | International audience We investigated the distributions and δ 13 C values of lipid biomarkers in authigenic carbonate crusts from the Nordic margin (Norwegian Sea). Abundant, highly 13 C-depleted archaeal and bacterial biomarkers revealed that anaerobic oxidation of methane (AOM) is associated with carbonate authigenesis at the Håkon Mosby Mud Volcano (HMMV) and the Nyegga pockmark field. No conclusive evidence for AOM was found in the crust sample from the Storegga Slide. ANME-2 methanotrophic archaea and sulfate-reducing bacteria from the Desulfosarcina/Desulfococcus cluster were inferred from lipid fingerprints. Distinct patterns of 13 C-depleted, non-isoprenoid dialkyl glycerol diethers (DAGEs) are possibly associated with unknown microbial partners in the AOM. |
---|