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  • 1
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    PANGAEA
    In:  Supplement to: Feng, Dong; Lin, Zhijia; Bian, Y; Chen, Duofu; Peckmann, Jörn; Bohrmann, Gerhard; Roberts, Harry H (2013): Rare earth elements of seep carbonates: Indication for redox variations and microbiological processes at modern seep sites. Journal of Asian Earth Sciences, 65, 27-33, https://doi.org/10.1016/j.jseaes.2012.09.002
    Publication Date: 2024-01-18
    Description: At marine seeps, methane is microbially oxidized resulting in the precipitation of carbonates close to the seafloor. Methane oxidation leads to sulfate depletion in sediment pore water, which induces a change in redox conditions. Rare earth element (REE) patterns of authigenic carbonate phases collected from modern seeps of the Gulf of Mexico, the Black Sea, and the Congo Fan were analyzed. Different carbonate minerals including aragonite and calcite with different crystal habits have been selected for analysis. Total REE content (SumREE) of seep carbonates varies widely, from 0.1 ppm to 42.5 ppm, but a common trend is that the SumREE in microcrystalline phases is higher than that of the associated later phases including micospar, sparite and blocky cement, suggesting that SumREE may be a function of diagenesis. The shale-normalized REE patterns of the seep carbonates often show different Ce anomalies even in samples from a specific site, suggesting that the formation conditions of seep carbonates are variable and complex. Overall, our results show that apart from anoxic, oxic conditions are at least temporarily common in seep environments.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
    Publication Date: 2024-02-02
    Keywords: 1997-JSL-I-2904; 1998-JSL-I-4061; 1998-JSL-I-4063; AC-1990; Alaminos Canyon; ALVIN; Aragonite; BEAM; Beam trawl; Bush Hill; Calcite; Center for Marine Environmental Sciences; Comment; Congo Fan; Dolomite; Event label; GeoB8212-2; GeoB8215-2; Gulf of Mexico; Illite; JSL; Kaolinite; Location; M56/2; MARUM; Meteor (1986); Muscovite; PO201F,G; POS201/6,7; POS201/6,7_UBS1; Poseidon; PV_RBS38; Quartz; Reference/source; Romanian shelf; S-4_2002; Sample ID; Submersible Alvin; Submersible Johnson Sea Link; Television-Grab; TVG; Ukrainian shelf; δ13C, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 142 data points
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  • 3
    Publication Date: 2024-02-02
    Keywords: 1997-JSL-I-2904; 1998-JSL-I-4061; 1998-JSL-I-4063; AC-1990; Alaminos Canyon; ALVIN; BEAM; Beam trawl; Bush Hill; Center for Marine Environmental Sciences; Cerium; Cerium anomaly; Congo Fan; Dysprosium; Erbium; Europium; Europium anomaly; Event label; Gadolinium; GeoB8212-2; GeoB8215-2; Gulf of Mexico; Holmium; Inductively coupled plasma - mass spectrometry (ICP-MS); JSL; Lanthanum; Lutetium; M56/2; MARUM; Meteor (1986); Neodymium; PO201F,G; POS201/6,7; POS201/6,7_UBS1; Poseidon; Praseodymium; PV_RBS38; Rare-earth elements; Romanian shelf; S-4_2002; Samarium; Sample ID; Submersible Alvin; Submersible Johnson Sea Link; Television-Grab; Terbium; Thulium; TVG; Type; Ukrainian shelf; Ytterbium
    Type: Dataset
    Format: text/tab-separated-values, 570 data points
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 6 (1986), S. 57-61 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 10 (1990), S. 177-181 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The hummocky continental slope in the northwestern Gulf of Mexico is the result of active salt tectonism and accompanying faulting. Fluid and gassy hydrocarbons rise through the sediment column and along faults causing the formation of gas hydrates, gassy sediments, mud volcanoes and mounds, chemosynthetic communities and authigenic carbonates, reefs, and hardgrounds. Salt activity coupled with processes associated with relative sea level fluctuations create a feedback relationship resulting in the above-mentioned phenomena as well as others such as seafloor erosion at great water depths.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Cyclic sequences occur worldwide in nearly every stratigraphic sequence; they are particularly well developed in marine deposits associated with large river systems. Superimposed on those cycles attributed to shifting sites of deposition are those related to high-frequency sea level changes. The large data base for this study (including 471 deep foundation borings, thousands of line kilometers of high-resolution seismic, and sedimentological and dating analyses) represents the most complete information on high-resolution chronostratigraphy and lithostratigraphy that is available on any modern continental shelf/upper slope. These data are used to document sedimentological characteristics and spatial depositional patterns during three complete sea level cycles over the entire continental shelf/upper slope of offshore Louisiana. Sedimentation during periods of high sea level is characterized by: 1) thin, slowly accumulated depositional sequences, referred to as condensed sections, 2) calcareous-rich deposits, including hemipelagic sediments and shell hashes, and 3) wide lateral continuity. Sedimentation during periods of low sea level is characterized by; 1) variable-thickness, rapidly accumulated sequences referred to as expanded sections, 2) coarse-grained elastic deposits, including abundant sands and gravels, and 3) well-defined depositional trends. Even though the data set covers only a short period of geologic time (240 000 yrs), these high frequency events are responsible for the deposition of excellent reservoir-quality facies in well-defined and predictable trends.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 5 (1985), S. 185-191 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Mass movement processes are the most important transport agents on the modern delta front. Changes in relative abundances of kaolinite, illite, and smectite proved to be valuable descriptors for distinguishing mudflow deposits (derived from the shallow delta front) from outer shelf/upper slope sediments. Fine-grained sediments, rapidly deposited from the turbid distributary plumes in the upper delta front, are typically high in smectite relative to illite and kaolinite. Distal shelf and upper slope sediments display an increased abundance of kaolinite and illite at the expense of smectite. Shifts in abundances of clay minerals define the bases and internal stratigraphy of complex mudflows.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Cyclic sequences occur worldwide in nearly every stratigraphic sequence; they are particularly well-developed in fluvial and deltaic sediments that have been influenced by high-frequency eustatic sea-level fluctuations. The large data base for this study (including 471 deep foundation borings, thousands of line kilometers of high-resolution seismic, and sedimentological and dating analyses) represents the most complete information on high-resolution chronostratigraphy and lithostratigraphy that is available on any modern continental shelf/upper slope. These data are used to document sedimentological characteristics and high-resolution seismic responses during three complete sea-level cycles over the entire continental shelf/upper slope of offshore Louisiana. Examination of high-resolution seismic records indicates that well-defined, high-amplitude, laterally continuous reflectors correlate with rising and high stand condensed sedimentary sequences and that the deposits laid down during falling and low-stand periods (expanded sections) are characterized by a wide range of acoustic responses. Discontinuous reflectors with high-amplitude variability, continuous parallel reflectors, and chaotic and amorphous zones are common acoustic responses. The association between a particular lithofacies and a specific acoustic response on 3.5-kHz records was found to be very poor.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 14 (1994), S. 126-134 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Samples were collected for foraminiferal studies by the Johnson Sea-Link I and II manned submersibles on the Louisiana continental slope. This paper documents that the mud, extruded onto the sea floor from depth by four mud volcanoes, ranges in age from Miocene to Pleistocene based on studies of the planktonic foraminiferal fauna. The vents are in water depths ranging from 300 to 690 m located in Garden Banks Block 382, Green Canyon Blocks 143 and 272, and Mississippi Canyon Block 929. Two mud volcanoes in GB 382 and MC 929 also have rich fossil foraminiferal microfaunas. We suggest that the extrusion of fossil sediments onto the sea floor during the Quaternary is a reasonable explanation for frequent occurrences of displaced fossil microfaunas encountered at depth in wells drilling on the flanks of salt diapirs in the slope environment. Results of this study have important implications for age dating subsurface sediments in bathyal locations.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Hydrocarbon-derived and microbially mediated authigenic carbonates occur over the entire depth range of the northern Gulf of Mexico slope. These carbonates consist of nodules and incipient nodules in surface sediments, hardgrounds and isolated slabs, and moundlike buildups of up to 10–20 m relief above the surrounding seafloor. The authigenic carbonates are characterized byδ 13C negative values in the range −18‰ to −55‰ (PDB) suggesting mixing of seawater carbon with13C-depleted carbon sources ranging from crude oil to biogenic methane. Near the shelf edge, carbonates are “diluted” with biogenic material produced by reefs—bioherms developed at low sea level stands. Fossil-poor carbonates over salt diapirs of the upper and middle slope formed in the shallow subsurface and have been exhumed by the combined processes of uplift and physical erosion. Middle and lower slope carbonates are generally rich in fossil shells of chemosynthetic organisms. Mg calcite pelloidal matrix and acicular to botryoidal aragonitic void-filling cements are common petrographic features of these hydrocarbonderived carbonates. At two sites carbonates are mixed with barite.
    Type of Medium: Electronic Resource
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