Carbon stable isotopic composition of benthic foraminifera from Pliocene cold methane seeps, Cascadia accretionary margin

Martin, Ruth A.; Nesbitt, Elizabeth A.; Campbell, Kathleen A.

doi:10.1016/j.palaeo.2006.10.002

Cited by 43 publications

(42 citation statements)

References 54 publications

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“…Low diversity and high dominance is also observed in some fossil seep areas (Panieri, 2005;Martin et al, 2007;Panieri et al, 2009Panieri et al, , 2012. Martin et al (2007Martin et al ( , 2010 and Panieri et al (2014) also stressed that there are no endemic benthic foraminiferal…”

Section: Origin Of the El Alcor Carbonatesmentioning

confidence: 85%

“…Many authors have emphasized that the C isotopic composition of benthic foraminifera inhabiting cold seep is similar to that recorded in non-seep foraminifera (Sen Gupta and Aharon, 1994;Sen Gupta et al, 1997;Rathburn et al, 2000;Hill et al, 2003Hill et al, , 2004Martin et al, 2004;Levin, 2005;Martin et al, 2007Martin et al, , 2010Li et al, 2010;Gieskes et al, 2011;Panieri et al, 2014). However, dissolved inorganic carbon from pore waters at seep sites is highly enriched in 12 C. This means that benthic foraminifera inhabiting these settings precipitate their test in clear isotopic disequilibrium with the interstitial waters (e.g.…”

Section: Accepted M Manuscriptmentioning

confidence: 93%

“…Gieskes et al, 2011). Several interpretations have been proposed to account for the observed offset of C isotopic composition, but none satisfactorily explains the differences (Rathburn et al, 2000(Rathburn et al, , 2003Martin et al, 2004;Martin et al, 2007Martin et al, , 2010Bernhard et al, 2010;Gieskes et al, 2011).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Martin et al (2007Martin et al ( , 2010 and Panieri et al (2014) also stressed that there are no endemic benthic foraminiferal…”

Section: Origin Of the El Alcor Carbonatesmentioning

confidence: 99%

“…In the study case, SEM analyses of benthic foraminifera show no secondary carbonate precipitation. However, cements can be overlooked (Martin et al, 2004;Martin et al, 2007Martin et al, , 2010 and, consequently, the isotopic signal can be slightly biased, accounting for the wide range of  13 C variation.…”

mentioning

confidence: 99%

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An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Aguirre

Braga

Martín

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Upper Miocene heterozoan carbonates crop out extensively in a NE-SW-trending belt (42 km long and 1.5-8 km wide) along the so-called El Alcor topographic high, from Carmona to Dos Hermanas (Seville, S Spain). These carbonates formed at the southern active margin of the Guadalquivir Basin, the foreland basin of the Betic Cordillera.They change to marls basinward (NE) and to sands landward (SE and SW). Therefore, carbonate production was constrained to a limited area in an otherwise siliciclastic shelf.The carbonates (up to 40 m thick) overlie a gradually coarsening-upward succession of marls followed by silts and sandstones. The carbonate sequence can be divided into three subunits corresponding, from bottom to top, to lowstand, transgressive, and highstands system tracts deposits. The lower subunit, exhibiting extensive trough crossbedding, is interpreted as a shallow-water bar deposit. The intermediate subunit onlaps underlying sediments and was deposited in deeper, low-turbulence conditions. The upper subunit deposits accumulated in a well-oxygenated outer platform based on benthic foraminiferal assemblages. The presence of hummocky and swaley crossstratification in these latter deposits suggests that they were affected by storms.Pervasive fluid-escape structures are also observed throughout the carbonates.The three subunits consist of bioclastic packstones to rudstones made up of abundant fragments of small mytilids. Isotopic data from serpulid polychaete Ditrupa tubes show 13 C-depleted values (up to -16.1‰), whereas  18 O yields normal marine values. Additional isotopic data on shells of scallops, oysters, and small mussels, as well as bulk sediment, show diagenetic alterations. Based on actualistic examples of massive concentrations of mussels, the nearly monospecific composition of the El Alcor deposits, together with negative  13 C values of Ditrupa tubes, indicates that cold seeps A C C E P T E D M A N U S C R I P T

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Section: Origin Of the El Alcor Carbonatesmentioning

confidence: 85%

Section: Accepted M Manuscriptmentioning

confidence: 93%

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Martin et al (2007Martin et al ( , 2010 and Panieri et al (2014) also stressed that there are no endemic benthic foraminiferal…”

Section: Origin Of the El Alcor Carbonatesmentioning

confidence: 99%

mentioning

confidence: 99%

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An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Aguirre

Braga

Martín

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Analysis of bubble plume distributions to evaluate methane hydrate decomposition on the continental slope

Johnson

Miller

Salmi

et al. 2015

Geochem Geophys Geosyst

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Cascadia margin sediments contain a rich reservoir of carbon derived both from terrestrial input and sea surface productivity. A portion of this carbon exists as solid gas hydrate within sediment pore spaces which previous studies have shown to be a methane reservoir of substantial size on both the Vancouver Island and Oregon portions of the Cascadia margin. Multichannel seismic reflection profiles on the Cascadia margin show the widespread presence of Bottom Simulating Reflectors (BSRs) within the sediment column, indicating the gas hydrate reservoir extends from the deformation front at 3000 m depth to the upper limit of gas hydrate stability near 500 m water depth. In this study, we compile an inventory of methane bubble plume sites on the Cascadia margin identified in investigations carried out for a range of interdisciplinary goals that also include sites volunteered by commercial fishermen. High plume density anomalies are associated with both the continental shelf (<180 m) and the depth of the upper limit of methane hydrate stability depth (MHSD) that occurs near 500 m in the NE Pacific. The observed anomalies on the Cascadia slope may be due to the warming of seawater at intermediate depths, suggesting that modern climate change has begun to destabilize the climate-sensitive hydrate reservoir within the Cascadia margin sediments. Reanalysis of similar plume images on the North American Atlantic slope suggests a lack of correlation between observed plume depths and the MHSD for much of the latitudinal range.

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Accretionary Wedge Tectonics and Gas Hydrate Distribution in the Cascadia Forearc

Tréhu

Phrampus

2022

World Atlas of Submarine Gas Hydrates in Continental Margins

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Carbon stable isotopic composition of benthic foraminifera from Pliocene cold methane seeps, Cascadia accretionary margin

Cited by 43 publications

References 54 publications

An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Analysis of bubble plume distributions to evaluate methane hydrate decomposition on the continental slope

Accretionary Wedge Tectonics and Gas Hydrate Distribution in the Cascadia Forearc

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