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  • 1
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    Rare earth elements of modern seeps from the Gulf of Mexico, the Black Sea, and the Congo Fan (2013)
    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
    Details
    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
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    (Table 2) Rare earth elements concentrations of the carbonates analyzed (2013)
    PANGAEA
    Details
    Publication Date: 2024-06-26
    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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  • 3
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    (Table 1) Background information on the studied samples (2013)
    PANGAEA
    Details
    Publication Date: 2024-06-26
    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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  • 4
    Electronic Resource
    Electronic Resource
    Accelerated currents and sediment transport off the Damietta Nile promontory (1981)
    [s.l.] : Nature Publishing Group
    Nature 293 (1981), S. 51-54 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Tidal data, including our own measurements, indicate a 10-cm average range and a S-cms'1 current amplitude. Wind direction is northerly from May to October and southwesterly from December to March, with speeds of 4-10 ms"1. The background current sets easterly, parallel to the coast throughout the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/293051a0
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  • 5
    Electronic Resource
    Electronic Resource
    Wave-current interactions on a shallow reef (Nicaragua, Central America) (1983)
    Springer
    Coral reefs 1 (1983), S. 209-214 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Measurements of wave height and currents associated with normal trade-wind conditions have been made on a linear reef that parallels the northern and northeastern coast of Great Corn Island, eastern shelf of Nicaragua, Central America. Analyses indicate that waves breaking over the reef crest generate lagoonward flow normal to the reef. Average reef-normal flow was in the range of 10 to 20 cm/s; however, individual wave surges reached values of up to 180 cm/s. The strength of the over-the-reef flow is modulated by the tide. Lagoon currents are weak (2–5 cm/s) and change direction with the tide as the lagoon fills and drains. Long-period oscillations in water level (30 s to 20 min) and in the current were observed, and may be important in transporting fine-grained sediments out of the reef-lagoon system. Strong, short-duration surge currents ( 〈5 s) transport coarse sediment from the breaker zone to the seaward margin of the backreef lagoon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304417
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  • 6
    Electronic Resource
    Electronic Resource
    Preface (1988)
    Springer
    Coral reefs 6 (1988), S. 121-121 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302007
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  • 7
    Electronic Resource
    Electronic Resource
    Sedimentary development of the Louisiana continental shelf related to sea level cycles: Part II—seismic response (1988)
    Springer
    Geo-marine letters 8 (1988), S. 109-119 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02330968
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  • 8
    Electronic Resource
    Electronic Resource
    Fossil Foraminifera from four active mud volcanoes in the Gulf of Mexico (1994)
    Springer
    Geo-marine letters 14 (1994), S. 126-134 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01203724
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  • 9
    Electronic Resource
    Electronic Resource
    Acoustical and geological characteristics of near-surface sediments, upper continental slope of northern Gulf of Mexico (1990)
    Springer
    Geo-marine letters 10 (1990), S. 200-208 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The continental slope off Texas and Louisiana is the most structurally and sedimentologically complex area in the Gulf of Mexico. This 120,000 km2 area is dominated by diapiric tectonics, resulting in numerous faults, oil and gas seeps, and other geological phenomena that affect near-surface sediments. Bottom gradients range from 0 to 20°. High-resolution seismic surveys, foundation borings, and drop cores reveal several mass-movement features, acoustic wipeout zones, sea floor erosion, faults, hardgrounds, bioherms, reefs, and outcrops. Recent data indicate that most geological activity takes place during relative sea level lowering and low stands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02431066
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  • 10
    Electronic Resource
    Electronic Resource
    Clay mineralogy of contrasting mudflow and distal shelf deposits on the Mississippi River delta front (1985)
    Springer
    Geo-marine letters 5 (1985), S. 185-191 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02281637
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