(Supplementary Table 1) Proportions of methane (C1) to ethane (C2) and the stable isotope composition of methane (δ¹³CCH4) of gas and oil collected by gas bubble sampler during METEOR cruise M114/2 in the southern Gulf of Mexico

Sahling, Heiko; Borowski, Christian; Escobar-Briones, Elva; Gaytán-Caballero, Adriana; Hsu, Chieh-Wei; Loher, Markus; MacDonald, Ian R.; Marcon, Yann; Pape, Thomas; Römer, Miriam; Rubin‐Blum, Maxim; Schubotz, Florence; Smrzka, Daniel; Wegener, Gunter; Bohrmann, Gerhard

doi:10.1594/pangaea.860373

2016

DOI: 10.1594/pangaea.860373

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(Supplementary Table 1) Proportions of methane (C1) to ethane (C2) and the stable isotope composition of methane (δ¹³CCH4) of gas and oil collected by gas bubble sampler during METEOR cruise M114/2 in the southern Gulf of Mexico

Heiko Sahling¹,

Christian Borowski²,

Elva Escobar-Briones³

et al.

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Massive asphalt deposits, oil seepage, and gas venting support abundant chemosynthetic communities at the Campeche Knolls, southern Gulf of Mexico

Sahling

Borowski

Escobar³

et al. 2016

Biogeosciences

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Abstract. Hydrocarbon seepage is a widespread process at the continental margins of the Gulf of Mexico. We used a multidisciplinary approach, including multibeam mapping and visual seafloor observations with different underwater vehicles to study the extent and character of complex hydrocarbon seepage in the Bay of Campeche, southern Gulf of Mexico. Our observations showed that seafloor asphalt deposits previously only known from the Chapopote Knoll also occur at numerous other knolls and ridges in water depths from 1230 to 3150 m. In particular the deeper sites (Chapopopte and Mictlan knolls) were characterized by asphalt deposits accompanied by extrusion of liquid oil in form of whips or sheets, and in some places (Tsanyao Yang, Mictlan, and Chapopote knolls) by gas emission and the presence of gas hydrates in addition. Molecular and stable carbon isotopic compositions of gaseous hydrocarbons suggest their primarily thermogenic origin. Relatively fresh asphalt structures were settled by chemosynthetic communities including bacterial mats and vestimentiferan tube worms, whereas older flows appeared largely inert and devoid of corals and anemones at the deep sites. The gas hydrates at Tsanyao Yang and Mictlan Knolls were covered by a 5-to-10 cm-thick reaction zone composed of authigenic carbonates, detritus, and microbial mats, and were densely colonized by 1–2 m-long tube worms, bivalves, snails, and shrimps. This study increased knowledge on the occurrences and dimensions of asphalt fields and associated gas hydrates at the Campeche Knolls. The extent of all discovered seepage structure areas indicates that emission of complex hydrocarbons is a widespread, thus important feature of the southern Gulf of Mexico.

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Massive asphalt deposits, oil seepage, and gas venting support abundant chemosynthetic communities at the Campeche Knolls, southern Gulf of Mexico

Sahling

Borowski

Escobar³

et al. 2016

Biogeosciences

Self Cite

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show abstract

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(Supplementary Table 1) Proportions of methane (C1) to ethane (C2) and the stable isotope composition of methane (δ¹³CCH4) of gas and oil collected by gas bubble sampler during METEOR cruise M114/2 in the southern Gulf of Mexico

Cited by 1 publication

References 0 publications

Massive asphalt deposits, oil seepage, and gas venting support abundant chemosynthetic communities at the Campeche Knolls, southern Gulf of Mexico

Massive asphalt deposits, oil seepage, and gas venting support abundant chemosynthetic communities at the Campeche Knolls, southern Gulf of Mexico

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