X-radiography of horizontal core slabs; a method for greater retrieval of sediment core data

Britt, Sanford L.; Bottjer, David J.; Fischer, Alfred G.; Flocks, James G.; Gorsline, Donn S.

doi:10.1306/d4267997-2b26-11d7-8648000102c1865d

Cited by 5 publications

(2 citation statements)

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“…Under this scenario, related sedimentary features such as complex folding, crumpling, deformation structures, or imbricated mud clasts (Baeten et al ; Van Daele et al ) should be observed in the sediments; Exchange of bottom seawater by infaunal animals or bioturbation. Animal burrows or traces from animal movements should be evident in the sediments if bioturbation is important (O'Brien ; Britt et al ; Löwemark and Werner ; Rebesco et al ); Enhanced exchange between bottom seawater and pore fluid due to irrigation by ascending methane bubbles from sub‐seafloor (Haeckel et al ; Chuang et al ); The concave up sulfate profiles have been interpreted as a result of increasing methane flux from below (Fischer et al ; Hensen et al ); Downward flow of bottom seawater into the shallow sediments (“aqueous pump” hereafter) as proposed by Tryon et al (). The aqueous pump mechanism refers to the invasion of bottom seawater into shallow sediments due to vigorous seeping of fluid in adjacent sediments.…”

Section: Resultsmentioning

confidence: 99%

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Removal of methane through hydrological, microbial, and geochemical processes in the shallow sediments of pockmarks along eastern Vestnesa Ridge (Svalbard)

Hong

Sauer

Panieri

et al. 2016

Limnology & Oceanography

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The recent discovery of methane seeps in the Arctic region requires a better understanding of the fate of methane in marine sediments if we are to understand the contributions of methane to Arctic ecosystems and climate change. To this goal, we analyze pore water data from five sites along eastern Vestnesa Ridge, a sediment drift off‐north‐west Svalbard, to quantify the consumption of dissolved methane across the sulfate‐methane‐transition‐zone which are 3–5 m below seafloor from the investigated sites. We use transport‐reaction models to quantify the hydrology as well as the carbon mass balance in the sediments. Pore water profiles and our model results demonstrate that hydrological, microbial, and geochemical processes/reactions efficiently remove methane carbon from fluid over different time scales. We interpret the nonsteady‐state behavior of the first 50–70 cm of our pore water profiles from the active sites as an annual scale downward fluid flow due to a seepage‐related pressure imbalance. Such downward flow supplies sulfate which enhances methane consumption through anaerobic oxidation of methane (AOM) within this depth range. Our steady‐state modeling confirms the efficiency of AOM in consuming dissolved methane in the upper 0.8–1.2 m of sediments. Based on the phosphate profiles, we estimate that AOM at the active pockmarks may have been operating for the last two to four centuries. Precipitation of authigenic carbonate removes more than a quarter of the dissolved inorganic carbon produced by AOM and fixes it as authigenic carbonate in the sediments, a process that sequestrates methane carbon over geological time.

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Section: Resultsmentioning

confidence: 99%

“…turbation. Animal burrows or traces from animal movements should be evident in the sediments if bioturbation is important(O'Brien 1987;Britt et al 1992;L€ owemark and Werner 2001;Rebesco et al …”

mentioning

confidence: 99%