Record of methane emissions from the West Svalbard continental margin during the last 23.500yrs revealed by δ13C of benthic foraminifera

Panieri, Giuliana; James, Rachael H.; Camerlenghi, Angelo; Westbrook, G. K.; Consolaro, Chiara; Cacho, Isabel; Cesari, Valentina; Cervera, Cristina Sanchez

doi:10.1016/j.gloplacha.2014.08.014

Cited by 58 publications

(66 citation statements)

References 83 publications

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“…The effect of authigenic carbonates on the isotopic composition of foraminiferal shells has been identified previously (e.g. The record of Consolaro et al (2015) showed indications of higher methane flux in sediments belonging to the end of the Allerød interstadial in the western part of the Vestnesa Ridge, while Panieri et al (2014) found the highest flux to occur in the lower Bølling interstadial as indicated by the distribution patterns and biostratigraphical correlation of the benthic foraminiferal faunas. However, authigenic overgrowth is not widely discussed and most studies from seep environments focus on benthic foraminifera without simultaneous measurements of the planktonic foraminifera, assuming that the entire depleted d 13 C signal is a result of calcification in pore water with DIC of very low d 13 C values (Hill et al 2004;Martin et al 2007Martin et al , 2010Panieri et al 2009Panieri et al , 2012.…”

Section: Mass Transport Depositssupporting

confidence: 64%

“…Torres et al 2003;Martin et al 2004;Uchida et al 2008). The events of low d 13 C values are located at different depths below the sediment surface in the various studied records, yet the timing of the event is similar: 390 cm in the core of Consolaro et al (2015), 108-247 cm in the core of Panieri et al (2014) (the SMTZ today is found 65 cm down-core), 85 and 225-230 cm in core JM10-335GC and 115-125 cm in core HH12-929GC (Fig. Alteration of the foraminiferal shells could have occurred soon after the foraminifera died or at any time during modern venting (Martin et al 2004).…”

Section: Mass Transport Depositsmentioning

confidence: 79%

“…The eastern part of the ridge is characterized by the presence of pockmarks and flares (Fig. Black circles mark cores from this study, black star = core JM10-330GC from Consolaro et al (2015), blue star = core JR211-26GC from Panieri et al (2014). Previous studies from Vestnesa Ridge have focused on variations in the release of methane based on isotope measurements in benthic Rasmussen et al (2007).…”

mentioning

confidence: 90%

“…foraminifera and comprised single records of either a short time interval (Consolaro et al 2015) or without a solid stratigraphy (Panieri et al 2014) (Figs 1B, 2). Thus a new comprehensive data analysis, which aims towards a reliable chronostratigraphy is needed.…”

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confidence: 99%

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Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years

Sztybor

Rasmussen

2016

Boreas

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T. L. 2017 (April): Diagenetic disturbances of marine sedimentary records from methane-influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years.The effect of seeping of methane on marine sediment records has been studied in four gravity cores from Vestnesa Ridge, Svalbard margin. The area shows acoustic signs in the form of flares indicating active methane gas seepage. For a better understanding of the timing and variability of the flux of methane in the past and the effects on potential proxies, a detailed study of the diagenetic processes that may affect the composition and structure of both sediments and foraminiferal shells is needed. Here we discuss deep-sea records from methane-influenced environments in three cores from an active and very heterogeneous seep-area (pockmark) and one core from outside the pockmark for background. The results include the distribution and stable isotopes of authigenic carbonates and of benthic and planktonic foraminifera, magnetic susceptibility, AMS-14 C dates, sedimentary data and biostratigraphy. Extremely low d 13 C values recorded in both benthic and planktonic foraminifera during the Bølling-Allerød interstadials indicate possible increased methane flux beginning at late Heinrich event H1. The recorded low values are mainly a result of diagenetic overprint by methane-derived authigenic carbonates. The d 18 O signals of authigenic carbonates are close to those of foraminiferal calcite and thus the d 18 O records remain a valid stratigraphical tool in methane seep sites, except in the case of severely encrusted samples. In addition, the records from the active pockmark show nearly constant values of low magnetic susceptibility in contrast to higher and more variable magnetic susceptibility values from the control station and other published records from normal sediments west of Svalbard. This phenomenon is probably caused by dissolution of magnetic minerals in the reducing environmental conditions of methane seep sediments, associated with anaerobic oxidation of methane and formation of paramagnetic minerals (pyrite). This process enables magnetic susceptibility to be used as a common diagnostic tool for identifying methane-related palaeo-reductive environments.

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Section: Mass Transport Depositssupporting

confidence: 64%

Section: Mass Transport Depositsmentioning

confidence: 79%

mentioning

confidence: 90%

mentioning

confidence: 99%

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Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years

Sztybor

Rasmussen

2016

Boreas

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“…In addition, the absence of benthic foraminifera in Unit I is also suggested aerobic oxidation of methane induced suboxic conditions (Li et al, unpublished data). The abundance of benthic foraminifera in modern intensive cold seep activity environment is typically low (Panieri et al, 2014). The absence of authigenic carbonate in study core may be due to the low efficient AOM, which induce the low alkalinity, or acidic environment caused by aerobic oxidation of methane, just like the cold seeps in convergent margin off Costa Rica and calcium carbonate dissolved in PETM (Zachos et al, 2005;Karaca et al, 2010;Consolaro et al, 2015).…”

Section: Aerobic Oxidation Of Methane In An Aom-dominated Environmentmentioning

confidence: 94%

Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea

Niu

Dong

Chen

et al. 2016

Marine and Petroleum Geology

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Estimates of future warming‐induced methane emissions from hydrate offshore west Svalbard for a range of climate models

Whitehouse

Minshull

Westbrook

et al. 2015

Geochem Geophys Geosyst

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Methane hydrate close to the hydrate stability limit in seafloor sediment could represent an important source of methane to the oceans and atmosphere as the oceans warm. We investigate the extent to which patterns of past and future ocean-temperature fluctuations influence hydrate stability in a region offshore West Svalbard where active gas venting has been observed. We model the transient behavior of the gas hydrate stability zone at 400-500 m water depth (mwd) in response to past temperature changes inferred from historical measurements and proxy data and we model future changes predicted by seven climate models and two climate-forcing scenarios (Representative Concentration Pathways RCPs 2.6 and 8.5). We show that over the past 2000 year, a combination of annual and decadal temperature fluctuations could have triggered multiple hydrate-sourced methane emissions from seabed shallower than 400 mwd during episodes when the multidecadal average temperature was similar to that over the last century (;2.68C). These temperature fluctuations can explain current methane emissions at 400 mwd, but decades to centuries of ocean warming are required to generate emissions in water deeper than 420 m. In the venting area, future methane emissions are relatively insensitive to the choice of climate model and RCP scenario until 2050 year, but are more sensitive to the RCP scenario after 2050 year. By 2100 CE, we estimate an ocean uptake of 97-1050 TgC from marine Arctic hydrate-sourced methane emissions, which is 0.06-0.67% of the ocean uptake from anthropogenic CO 2 emissions for the period 1750-2011.

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Record of methane emissions from the West Svalbard continental margin during the last 23.500yrs revealed by δ13C of benthic foraminifera

Cited by 58 publications

References 83 publications

Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years

Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years

Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea

Estimates of future warming‐induced methane emissions from hydrate offshore west Svalbard for a range of climate models

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