Miniaturized biosignature analysis reveals implications for the formation of cold seep carbonates at Hydrate Ridge (off Oregon, USA)

Leefmann, Tim; Bauermeister, J.; Kronz, Andreas; Liebetrau, Volker; Reitner, Joachim; Thiel, Volker

doi:10.5194/bgd-4-4443-2007

Cited by 4 publications

(34 citation statements)

References 22 publications

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“…To avoid contamination and loss of target compounds during sample work-up, the number of steps and chemicals involved were reduced as far as practicable (adopted from Leefmann et al 2008). Due to the extremely small sample amounts, carbonate was not dissolved with dilute HCl, nor were the samples saponified in KOH ⁄ methanol as performed in studies of (bulk) seep carbonates to better access lipids that are secluded in the carbonate lattice (e.g.…”

Section: Collection and Preparation Of Seep Limestones From The Lcfmentioning

confidence: 99%

“…Pape et al 2005;Bahr et al 2010) and that the different carbonate phases are indicative for the mediation by certain ANME groups (e.g. Reitner et al 2005;Leefmann et al 2008). However, such relationships are as yet poorly constrained.…”

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confidence: 99%

“…Combining biomarker results and petrographic evidence from carbonate phases and fabrics, it is consequently possible to identify the involvement of specific microbial processes in the formation of ancient seep carbonates. Until now, however, mostly bulk samples have been analysed for biomarkers, whereas only a few studies on modern seep deposits have so far attempted to retrieve information preserved in individual seep carbonate horizons and ⁄ or mineral phases (Aloisi et al 2002;Leefmann et al 2008;Stadnitskaia et al 2008;Bahr et al 2009;Haas et al 2010). On a mmscale, a highly selective distribution of lipid biomarkers was found within modern seep carbonate phases from Hydrate Ridge (off Oregon, USA; Leefmann et al 2008).…”

mentioning

confidence: 99%

“…Until now, however, mostly bulk samples have been analysed for biomarkers, whereas only a few studies on modern seep deposits have so far attempted to retrieve information preserved in individual seep carbonate horizons and ⁄ or mineral phases (Aloisi et al 2002;Leefmann et al 2008;Stadnitskaia et al 2008;Bahr et al 2009;Haas et al 2010). On a mmscale, a highly selective distribution of lipid biomarkers was found within modern seep carbonate phases from Hydrate Ridge (off Oregon, USA; Leefmann et al 2008). These seep carbonates are comprised of a paragenetic sequence of microcrystalline grey micrite, whitish (partly pinkish and brownish) cryptocrystalline aragonite and fibrous translucent aragonite (Teichert et al 2005).…”

mentioning

confidence: 99%

“…These seep carbonates are comprised of a paragenetic sequence of microcrystalline grey micrite, whitish (partly pinkish and brownish) cryptocrystalline aragonite and fibrous translucent aragonite (Teichert et al 2005). Using a miniaturized preparation technique, requiring only tens of mg of sample for coupled gas chromatography ⁄ mass spectrometry (GC ⁄ MS) analysis, it was shown that more than 90% of the AOM-derived biomarkers in the total rock are enclosed in the whitish cryptocrystalline aragonite (Leefmann et al 2008). The biomarker and inorganic patterns indicated an association of this aragonite phase with methanotrophic consortia, probably consisting of ANME-2 archaea and associated SRB.…”

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confidence: 99%

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Biomarkers from individual carbonate phases of an Oligocene cold-seep deposit, Washington State, USA

Hagemann

Leefmann

Peckmann

et al. 2013

LET

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An Oligocene cold‐seep limestone (Lincoln Creek Formation, Washington State, USA) was studied for its lipid biomarker inventory. Biomarker analysis on minute amounts of sample (tens of mg) and complementary 13Ccarbonate analyses allowed us to link biogeochemical processes with individual, closely intertwined carbonate phases. The ancient seep deposit exhibits four major carbonate phases, according to the paragenetic sequence of (I) micrite, (II) yellow aragonite, (III) clear aragonite and (IV) equant calcite spar. For the micrite, varying but significant amounts of archaea‐derived isoprenoids clearly indicate that the precipitation of this phase was induced by the microbial anaerobic oxidation of methane (AOM). However, water column‐derived lipids present in this carbonate phase reflect the incorporation of organic matter from background sediment cemented by authigenic micrite. Yellow aragonite made up only a minor rock component (<10% vol.), but contained a major portion of lipid biomarkers indicative of AOM. Along with low δ13Ccarbonate values (less than −30‰ Pee Dee Belemnite), this points to an intimate spatial association of AOM consortia with the precipitation of yellow aragonite. Clear aragonite showed similar δ13Ccarbonate values but much lower, if any, contents of AOM biomarkers. This suggests that AOM‐derived carbonate ions diffused over a greater distance to the site of precipitation compared with yellow aragonite. The latest phase, equant calcite spar, did not yield appreciable biomarkers, but showed a notable 13Ccarbonate‐enrichment that is most likely caused by methanogenesis that prevailed in the sediments after AOM activity had ceased. A comparison of the ancient seep carbonates with modern counterparts from Hydrate Ridge (offshore Oregon, USA) revealed a remarkable coincidence of the respective mineral phases and their biomarker patterns. This suggests that the mechanisms of carbonate formation and the associated biogeochemical processes remained unchanged over geological times. □Biomarkers, carbonates, cold seeps, Hydrate Ridge, isotopes, Oligocene, Washington.

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Section: Collection and Preparation Of Seep Limestones From The Lcfmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Biomarkers from individual carbonate phases of an Oligocene cold-seep deposit, Washington State, USA

Hagemann

Leefmann

Peckmann

et al. 2013

LET

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Marine Cold Seeps

Suess

2010

Handbook of Hydrocarbon and Lipid Microbiology

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U-Th chronology and formation controls of methane-derived authigenic carbonates from the Hola trough seep area, northern Norway

et al. 2017

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We investigated methane-derived authigenic carbonate (MDAC) crusts and nodules from a cold seep site on the northern Norwegian continental shelf in ca. 220 m water depth to determine the timing and mode of their formation. Gas bubbling observed during remotely operated vehicle (ROV)-assisted sampling of MDAC crusts revealed ongoing seep activity. Authigenic carbonates were present as crusts on the seafloor and as centimetre-size carbonate-cemented nodules at several intervals within an adjacent sediment core. Aragonite-dominated mineralogy of the MDAC crusts suggests formation close to the seafloor at higher rates of sulphate-dependent anaerobic oxidation of methane (AOM). In contrast, dolomite-cemented nodules are consistent with the formation at the sulphate-methane-transition zone deeper within the sediment at lower rates of AOM. The δ 13 C-carbonate values of bulk rock and of micro-drilled aragonite samples vary between − 22.2‰ and − 34.6‰ (VPDB). We interpret the carbon in aragonite to be mainly derived from the anaerobic oxidation of thermogenic methane, with a minor contribution from seawater dissolved inorganic carbon (DIC). AOM activity is supported by high concentrations of AOM-related biomarkers of archaea (archaeol and 2-sn-hydroxyarchaeol) and sulphate-reducing bacteria (iso and anteiso-C 15:0 fatty acids) in the crusts. The dolomite nodules exhibit higher δ 13 C-carbonate values (− 12‰ VPDB) suggesting a smaller amount of methane-derived carbon, presumably due to the contribution of DIC migrating from depth, and lower AOM rates. The latter is supported by orders of magnitude lower concentrations of archaeol and sn-2-hydroxyarchaeol in the sediment interval containing the largest dolomite nodules. δ 18 O values of pure aragonite samples and dolomite nodules indicate the precipitation of carbonate close to isotopic equilibrium with seawater and no influence of gas hydrate-derived water. U-Th dating of two MDAC crusts shows that they formed between 1.61 ± 0.02 and 4.39 ± 1.63 ka BP and between 2.65 ± 0.02 and 4.32 ± 0.08 ka BP. We infer both a spatial and temporal change in methane flux and related MDAC formation at this seep site. These changes might be caused by regional seismic events that can affect pore pressure or re-activation of migration pathways thus facilitating fluid flow from deep sources towards the seabed.

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Miniaturized biosignature analysis reveals implications for the formation of cold seep carbonates at Hydrate Ridge (off Oregon, USA)

Cited by 4 publications

References 22 publications

Biomarkers from individual carbonate phases of an Oligocene cold-seep deposit, Washington State, USA

Biomarkers from individual carbonate phases of an Oligocene cold-seep deposit, Washington State, USA

Marine Cold Seeps

U-Th chronology and formation controls of methane-derived authigenic carbonates from the Hola trough seep area, northern Norway

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