Characterizing organic matter in marine sediments associated with gas hydrate and oil seepage from the Gulf of Mexico

Song, Zhiguang; Wang, L.; Liu, J.; Wang, C.; Chen, D.

doi:10.1111/j.1468-8123.2008.00225.x

Cited by 13 publications

(9 citation statements)

References 28 publications

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“…Marine-derived organic matter content in sediments is greater in areas associated with high rates of primary productivity in the surface waters [ 4 ]. Other sources of sedimentary organic carbon are erosion of sedimentary rocks from the Mississsipi River drainage basin, and fossil fuels from natural oil seeps and petroleum exploration [ 3 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbons in Deep-Sea Sediments following the 2010 Deepwater Horizon Blowout in the Northeast Gulf of Mexico

et al. 2015

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The Deepwater Horizon (DWH) spill released 4.9 million barrels of oil into the Gulf of Mexico (GoM) over 87 days. Sediment and water sampling efforts were concentrated SW of the DWH and in coastal areas. Here we present geochemistry data from sediment cores collected in the aftermath of the DWH event from 1000 – 1500 m water depth in the DeSoto Canyon, NE of the DWH wellhead. Cores were analyzed at high-resolution (at 2 mm and 5 mm intervals) in order to evaluate the concentration, composition and input of hydrocarbons to the seafloor. Specifically, we analyzed total organic carbon (TOC), aliphatic, polycyclic aromatic hydrocarbon (PAHs), and biomarker (hopanes, steranes, diasteranes) compounds to elucidate possible sources and transport pathways for deposition of hydrocarbons. Results showed higher hydrocarbon concentrations during 2010-2011 compared to years prior to 2010. Hydrocarbon inputs in 2010-2011 were composed of a mixture of sources including terrestrial, planktonic, and weathered oil. Our results suggest that after the DWH event, both soluble and highly insoluble hydrocarbons were deposited at enhanced rates in the deep-sea. We proposed two distinct transport pathways of hydrocarbon deposition: 1) sinking of oil-particle aggregates (hydrocarbon-contaminated marine snow and/or suspended particulate material), and 2) advective transport and direct contact of the deep plume with the continental slope surface sediments between 1000-1200 m. Our findings underline the complexity of the depositional event observed in the aftermath of the DWH event in terms of multiple sources, variable concentrations, and spatial (depth-related) variability in the DeSoto Canyon, NE of the DWH wellhead.

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Section: Introductionmentioning

confidence: 99%

Hydrocarbons in Deep-Sea Sediments following the 2010 Deepwater Horizon Blowout in the Northeast Gulf of Mexico

et al. 2015

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“…Lipids were extracted repeatedly from HCl dissolved solution by dichloromethane, and then put together with the soxhlet-extracted organic matter. The organic extracts were separated by column chromatography into fractions: (1) hydrocarbons (n-hexane); (2) aromatic (n-hexane/dichloromethane, 6 : 4; v : v); and (3) polar frac tion (methanol) [19,20,[28][29][30][31].…”

Section: Methodsmentioning

confidence: 99%

“…The isotopic error of parallel analysis is less than 0.5‰. Carbon isotope ratios are given as δ-values (δ 13 C in ‰) relative to the V-PDB-standard and have been corrected for the addition of carbon during preparation of FAMEs [31,32].…”

Section: Apparatus Analysesmentioning

confidence: 99%

Fatty-acids and their δ 13C characteristics of seep carbonates from the northern continental slope of Gulf of Mexico

Guan

Dong

et al. 2009

Chin. Sci. Bull.

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Here we reported the fatty-acids and their δ 13 C values in seep carbonates collected from Green Canyon lease block 185 (GC 185; Sample GC-F) at upper continental slope (water depth: ~540 m), and Alaminos Canyon lease block 645 (GC 645; Sample AC-E) at lower continental slope (water depth: ~2200 m) of the Gulf of Mexico. More than thirty kinds of fatty acids were detected in both samples. These fatty acids are maximized at C 16 . There is a clear even-over-odd carbon number predominance in carbon number range. The fatty acids are mainly composed of n-fatty acids, iso-/anteiso-fatty acids and terminally branched odd-numbered fatty acids (iso/anteiso). The low δ 13 C values (−39.99‰ to −32.36‰) of n-C 12:0 , n-C 13:0 , i-C 14:0 and n-C 14:0 suggest that they may relate to the chemosynthetic communities at seep sites. The unsaturated fatty acids n-C 18:2 and C 18:1 △ 9 have the same δ 13 C values, they may originate from the Beggiatoa/Thioploca. Unlike other fatty acids, the terminally branched fatty acids (iso/anteiso) show lower δ 13 C values (as low as −63.95‰) suggesting a possible relationship to sulfate reducing bacteria, which is common during anaerobic oxidation of methane at seep sites. fatty acids, carbon isotope of individual lipid, sulfate reducing bacteria, anaerobic oxidation of methane, seep carbonate, Gulf of Mexico Citation: Guan H X, Feng D, Wu N Y, et al. Fatty-acids and their δ 13 C characteristics of seep carbonates from the northern continental slope of Gulf of Mexico.

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“…Marine sediments from the Gulf of Mexico were studied by Song et al. (2008) in terms of the abundance, composition, and distribution of organic matter.…”

Section: Contributions Of This Thematic Editionmentioning

confidence: 99%

“…Marine sediments from the Gulf of Mexico were studied by Song et al (2008) in terms of the abundance, composition, and distribution of organic matter. The results show that there are great spatial variations in terms of the abundance of organic matter and the hydrocarbon composition among these samples.…”

Section: Contributions Of This Thematic Editionmentioning

confidence: 99%

Recent progress in the application of gas geochemistry: examples from Taiwan and the 9th International Gas Geochemistry Conference

Yang¹

2008

Geofluids

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Gas geochemistry in the last two decades has emerged as an important scientific tool in geosciences due to the significant improvement of instrumentation. A review of recent progress in this field, based on the examples in Taiwan, shows that gas geochemistry is applicable to a wide range of problems in Earth sciences. The International Conferences on Gas Geochemistry (ICGG), held since 1982, are the only international venues exclusively dedicated to studies of gas geochemistry. This thematic edition, which includes 11 case studies presented during the 9th ICGG held in Taipei, 2007, covers a wide range of topics from both on-land and submarine geothermal, seepage ⁄ venting studies to gas flux estimation from mangroves and optimum sequestration depth for CO 2 geological storage.

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Characterizing organic matter in marine sediments associated with gas hydrate and oil seepage from the Gulf of Mexico

Cited by 13 publications

References 28 publications

Hydrocarbons in Deep-Sea Sediments following the 2010 Deepwater Horizon Blowout in the Northeast Gulf of Mexico

Hydrocarbons in Deep-Sea Sediments following the 2010 Deepwater Horizon Blowout in the Northeast Gulf of Mexico

Fatty-acids and their δ 13C characteristics of seep carbonates from the northern continental slope of Gulf of Mexico

Recent progress in the application of gas geochemistry: examples from Taiwan and the 9th International Gas Geochemistry Conference

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