Distribution, Origin, and Hydrocarbon-Potential of Organic Matter in Sediments from the Pacific Margin of Southern Mexico

Summerhayes, Colin; Gilbert, D.

doi:10.2973/dsdp.proc.66.119.1982

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…The alternating isotopic values may reflect sorting during several episodes of slump movement or turbidity flows or both (Rovang, 1981). The presence of terrestrial organic matter in deep-water sediments has been interpreted to be the result of along-slope transport of material brought to the base of the slope in fast-moving turbidity currents (Newman et al, 1973;Summerhayes and Gilbert, 1982a). The general δ 13 C org increase with depth in the Pliocene section is consistent with an increase in water depth to abyssal depths during this period, as suggested in the site reports.…”

Section: Site 565 (Lower Slope)supporting

confidence: 69%

“…2). The majority of the section analyzed was Miocene in age (215-325 m) and had a relatively low organic-carbon content, as previously documented for the Cocos Plate (Summerhayes and Gilbert, 1982a). The basement serpentinite layer (325-359 m) was very low in organic-carbon content, averaging 0.06%.…”

Section: Site 567 (Cocos Plate)mentioning

confidence: 57%

“…On the basis of the previously mentioned studies, we propose that this trend may reflect the relatively low carbon levels associated with terrestrial input as well as the high water-column productivity (upwelling) that produces high levels of marine-dominated organic-carbon sedimentation. The preservation of the high levels of marine organic matter (up to 4%) in the sediment may be the result of oxygen depletion (Summerhayes and Gilbert, 1982b;Lisitzin, 1972;Kester, 1975). Low organic-carbon contents associated with terrestrially dominated sediments (based on carbon-isotopic compositions) may be due to the small land area in the study area and its minimal runoff.…”

Section: Discussionmentioning

confidence: 99%

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Nonvolatile Organic Matter at Sites 565-570, Deep Sea Drilling Project Leg 84

Kennicutt¹,

Brooks²,

McDonald³

et al. 1985

Initial Reports of the Deep Sea Drilling Project

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Organic-carbon content and carbon isotopic compositions within the Pleistocene and Pliocene-Oligocene sections at Sites 565-570 in the Middle American Trench area were internally consistent. For the Pleistocene section, a decrease in organic-carbon content toward present-day land and a relatively constant carbon isotopic composition (δ 13 C = -20.1 to -21.6‰) was observed. For the Pliocene-Oligocene section, there is a general increase in organic-carbon content in the direction of present-day land. A general relationship between organic-carbon content and carbon isotopic ratios was observed where high organic-carbon levels were associated with heavier (more positive) carbon isotopic ratios and where low organic-carbon concentrations were associated with lighter (more negative) carbon isotope values. Hexane-extractable organic matter (EOM) was generally less than 500 ppm at all sites and showed a random distribution. Fluorescence spectral patterns confirmed the presence of a few in situ aromatic compounds and a low level background of migrated petrogenic hydrocarbons. High perylene concentrations were associated with organic-carbon isotopic compositions typical of marine organic matter.

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Section: Site 565 (Lower Slope)supporting

confidence: 69%

Section: Site 567 (Cocos Plate)mentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Nonvolatile Organic Matter at Sites 565-570, Deep Sea Drilling Project Leg 84

Kennicutt¹,

Brooks²,

McDonald³

et al. 1985

Initial Reports of the Deep Sea Drilling Project

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show abstract

“…Modern trench and trench-slope sediments of Nankai Trough, Cascadia, and the Aleutians, where sediment flux is high, contain <1% TOC (Dow, 1979;Kvenvolden and von Huene, 1985; Hessler and Sharman | Subduction zones and their hydrocarbon systems GEOSPHERE | Volume 14 | Number 5 Mukhopadhyay et al, 1986). However, the accretionary prism exposed in Barbados contains viable source rock (1%-4% TOC; Larue et al, 1985), as do trench-slope deposits along the Middle America Trench offshore Mexico and Guatemala (Summerhayes andGilbert, 1982a, 1982b;Gilbert and Cunningham, 1985). Strong coastal upwelling along the coast of Peru is associated with high TOC (1%-8%) in trench-slope deposits (Suess and von Huene, 1988).…”

Section: Source Rockmentioning

confidence: 99%

Subduction zones and their hydrocarbon systems

Hessler¹,

Sharman

2018

Geosphere

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Subduction zones are common tectonic features central to large-scale crustal and elemental cycling, and they are accompanied by basins often with thick sedimentary fill and structures suitable for hydrocarbon preservation. However, significant hydrocarbon production occurs in only a handful of subduction zone locations. Here we explore our current understanding of the controls on hydrocarbon systems associated with subduction zones, in terms of the strongly variable conditions inherent to this tectonic setting that either favor or limit petroleum production, and in the context of three case studies (Cook Inlet and Sacramento basins, USA; Talara basin, Peru). This review concentrates on continental rather than intra-oceanic subduction settings due to limited basin preservation and hydrocarbon prospectivity in the latter. Overall, the primary limitations on hydrocarbon potential in forearc and/or trenchslope basins are time-to-maturation (low geothermal gradients), reservoir quality, source-rock presence and quality, structural complexity, and depth to reservoir. The latter two conditions may explain why offshore exploration has been limited near subduction zones, even where onshore production is robust and/or hydrocarbon seeps are common. Prospectivity may increase with enhanced seismic imaging and offshore infrastructure in some locations, and with the economic development of unconventional resources such as gas hydrates in accretionary prisms or deep shale gas in forearc basins. In any case, the presence of hydrocarbon systems in subduction zones, whether prospective or not, is an important part of the cycling of carbon and other elements at active convergent margins.

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(Table 1) Age, lithology, sedimentation rate, organic matter, and thermal alteration index of DSDP samples from DSDP Leg 66 Holes

Summerhayes,

Gilbert

1982

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Distribution, Origin, and Hydrocarbon-Potential of Organic Matter in Sediments from the Pacific Margin of Southern Mexico

Cited by 5 publications

References 8 publications

Nonvolatile Organic Matter at Sites 565-570, Deep Sea Drilling Project Leg 84

Nonvolatile Organic Matter at Sites 565-570, Deep Sea Drilling Project Leg 84

Subduction zones and their hydrocarbon systems

(Table 1) Age, lithology, sedimentation rate, organic matter, and thermal alteration index of DSDP samples from DSDP Leg 66 Holes

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