Hydrocarbon-derived carbonate buildups of the northern Gulf of Mexico continental slope: A review of submersible investigations

Roberts, Harry H.; Aharon, Paul

doi:10.1007/bf01203725

Cited by 285 publications

(182 citation statements)

References 24 publications

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“…To date, only two locations in the GoM are known, namely Bush Hill (Feng et al, 2009a) and Chapopote (Naehr et al, 2009), that have seep carbonates dominated by aragonite. The carbonate microfabrics found in AC 645 samples are similar to those of other seep deposits (Roberts and Aharon, 1994;Naehr et al, 2000Naehr et al, , 2009Peckmann et al, 2002;Feng et al, 2009a;Feng and Roberts, 2010;Roberts et al, 2010a). Botryoidal aragonite has been interpreted as microbially induced carbonate phase (Roberts et al, 1993).…”

Section: Environmental Conditions During Carbonate Precipitationsupporting

confidence: 57%

“…The dominance of aragonite in the carbonates from AC 645 is in great contrast to carbonates from other seep sites of the GoM, which usually reveal various carbonate mineralogies (Roberts and Aharon, 1994;Feng and Roberts, 2010;Roberts et al, 2010a). To date, only two locations in the GoM are known, namely Bush Hill (Feng et al, 2009a) and Chapopote (Naehr et al, 2009), that have seep carbonates dominated by aragonite.…”

Section: Environmental Conditions During Carbonate Precipitationmentioning

confidence: 96%

“…Most of these seeps occur at the margins of salt structures, where deep-penetrating faults function as migration routes for fluids and gases from the deep hydrocarbon-generating strata (Roberts and Aharon, 1994;Roberts et al, 2010a,b). The Alaminos Canyon (AC) area is located in the deepwater of the western GoM (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…Since carbonate precipitation is closely linked with the process of AOM, seep carbonates are excellent long-term archives of past seepage and associated environmental parameters (Ritger et al, 1987;Roberts and Aharon, 1994;Bohrmann et al, 1998;Peckmann et al, 2001;Peckmann et al, 2009;Bayon et al, 2009;Feng et al, 2009aFeng et al, ,b, 2010aHaas et al, 2010). Due to the control of AOM activity on carbonate precipitation, molecular fossils (i.e.…”

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confidence: 99%

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Changing redox conditions at cold seeps as revealed by authigenic carbonates from Alaminos Canyon, northern Gulf of Mexico

et al. 2011

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Section: Environmental Conditions During Carbonate Precipitationsupporting

confidence: 57%

Section: Environmental Conditions During Carbonate Precipitationmentioning

confidence: 96%

Section: Geological Settingmentioning

confidence: 99%

mentioning

confidence: 99%

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Changing redox conditions at cold seeps as revealed by authigenic carbonates from Alaminos Canyon, northern Gulf of Mexico

et al. 2011

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“…Campbell, 2006;Taviani, 2010). They occur as fossil concentrations in isolated mound-like micritic floatstone intercalated within siliciclastic and referred to as chemoherms (Aharon, 1994;Roberts and Aharon, 1994;Majima et al, 2005). By contrast, the El Alcor carbonates form a continuous and homogeneous bioclastic body extending for dozens of square kilometers.…”

mentioning

confidence: 99%

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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Axial obliquity control on the greenhouse carbon budget through middle‐ to high‐latitude reservoirs

et al. 2015

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Carbon sources and sinks are key components of the climate feedback system, yet their response to external forcing remains poorly constrained, particularly for past greenhouse climates. Carbon-isotope data indicate systematic, million-year-scale transfers of carbon between surface reservoirs during and immediately after the Late Cretaceous thermal maximum (peaking in the Cenomanian-Turonian, circa 97-91 million years, Myr, ago). Here we calibrate Albian to Campanian (108-72 Myr ago) high-resolution carbon isotope records with a refined chronology and demonstrate how net transfers between reservoirs are plausibly controlled by~1 Myr changes in the amplitude of axial obliquity. The amplitude-modulating terms are absent from the frequency domain representation of insolation series and require a nonlinear, cumulative mechanism to become expressed in power spectra of isotope time series. Mass balance modeling suggests that the residence time of carbon in the ocean-atmosphere system is-by itself-insufficient to explain the Myr-scale variability. It is proposed that the astronomical control was imparted by a transient storage of organic matter or methane in quasi-stable reservoirs (wetlands, soils, marginal zones of marine euxinic strata, and potentially permafrost) that responded nonlinearly to obliquity-driven changes in high-latitude insolation and/or meridional insolation gradients. While these reservoirs are probably underrepresented in the geological record due to their quasi-stable character, they might have provided an important control on the dynamics and stability of the greenhouse climate.

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Hydrocarbon-derived carbonate buildups of the northern Gulf of Mexico continental slope: A review of submersible investigations

Cited by 285 publications

References 24 publications

Changing redox conditions at cold seeps as revealed by authigenic carbonates from Alaminos Canyon, northern Gulf of Mexico

Changing redox conditions at cold seeps as revealed by authigenic carbonates from Alaminos Canyon, northern Gulf of Mexico

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

Axial obliquity control on the greenhouse carbon budget through middle‐ to high‐latitude reservoirs

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