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  • 1
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    (Table 4) Analyses of thermogenic gas-hydrated sediments
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Calcium carbonate; Carbon, organic, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; Extract; Green-Canyon-184; Green-Canyon-204; Green-Canyon-234; Mississippi-Canyon; PC; Piston corer; Sulfur, total; δ13C, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 189 data points
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  • 2
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    (Table 5) Analyses of biogenic gas-hydrated sediments
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Calcium carbonate; Carbon, organic, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; Extract; Garden-Banks-388; Green-Canyon-257; Green-Canyon-320; PC; Piston corer; Sulfur, total; δ13C, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 168 data points
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  • 3
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    (Table 6) Concentrations of hydrocarbons in hydrated sediment cores
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; Garden-Banks-388; Green-Canyon-204; Green-Canyon-234; Green-Canyon-257; Green-Canyon-320; Mississippi-Canyon; n-Alkane, per unit mass total organic carbon; PC; Piston corer; Sample code/label; Unresolved complex mixture
    Type: Dataset
    Format: text/tab-separated-values, 396 data points
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  • 4
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    (Table 1) Molecular and carbon-isotopic compositions of void gas from DSDP Leg 96
    PANGAEA
    In:  Supplement to: Pflaum, Ronald C; Brooks, James M; Cox, H Benjamin; Kennicutt, Mahlon C; Sheu, Der-Duen (1986): Molecular and isotopic analysis of core gases and gas hydrates, Deep Sea Drilling Project Leg 96. In: Bouma, AH; Coleman, JM; Meyer, AW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 96, 781-784, https://doi.org/10.2973/dsdp.proc.96.149.1986
    Details
    Publication Date: 2023-06-27
    Description: Molecular and isotopic compositions of void gases from Sites 618 and 619 were determined. The gases were predominantly methane with the C1/C2 ratios averaging 4,000 and 26,000 at Sites 618 and 619, respectively. The delta13C-C1 values at Site 618 were nearly constant, ranging from - 70.1 to - 73.7 per mil. delta13C-CH1 values for Site 619 between 76 and 178 meters sub-bottom ranged from - 94.8 to - 70.8 per mil, becoming progressively heavier with depth. The molecular and isotopic compositions at both sites are characteristic of biogenic methane. Small spheres (~ 1-2 mm diameter) of gas hydrates were observed in the Orca Basin between 20 and 40 m sub-bottom and were often associated with sandy sections. The hydrate was predominantly methane with a delta13-C1 of - 7 per mil and trace amounts of ethane, propane, and carbon dioxide. The isotopic value for the methane was similar to that of the nearest gas pocket, indicating that hydrate was formed from predominantly biogenic methane without isotopic fractionation.
    Keywords: 96-618; 96-619; 96-620; 96-621; Carbon dioxide; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Ethane; Event label; Gas chromatograph Carle Model 800; Gas chromatograph Hewlett-Packard 571OA; Glomar Challenger; Gulf of Mexico; Gulf of Mexico/BASIN; Gulf of Mexico/FAN; Latitude of event; Leg96; Longitude of event; Mass spectrometer Nuclide RMS 60; Methane; Methane/ethane ratio; Sample code/label; δ13C, methane
    Type: Dataset
    Format: text/tab-separated-values, 191 data points
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  • 5
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    (Table 2) Stable carbon isotope composition of the occludes hydrate gas and gas-fluid ratios for the Gulf of Mexico sediments
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 96-618_Site; Comment; COMPCORE; Composite Core; Deep Sea Drilling Project; DEPTH, sediment/rock; DSDP; Event label; Garden-Banks-388; Glomar Challenger; Green-Canyon-184; Green-Canyon-204; Green-Canyon-234; Green-Canyon-257; Green-Canyon-320; Gulf of Mexico/BASIN; Leg96; Mississippi-Canyon; PC; Piston corer; δ13C, butane; δ13C, carbon dioxide, aquatic; δ13C, ethane; δ13C, methane; δ13C, propane
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 6
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    Gas hydrates of the Gulf of Mexico
    PANGAEA
    In:  Supplement to: Brooks, James M; Cox, H Benjamin; Bryant, William; Kennicutt, Mahlon C; Mann, Robert G; McDonald, Thomas J (1985): Association of gas hydrates and oil seepage in the Gulf of Mexico. Organic Geochemistry, 10(1-3), 221-234, https://doi.org/10.1016/0146-6380(86)90025-2
    Details
    Publication Date: 2023-06-27
    Description: Gas hydrates were recovered from eight sites on the Louisiana slope of the Gulf of Mexico. The gas hydrate discoveries ranged in water depths from 530 to 2400 m occurring as small to medium sized (0.5-50 mm) nodules, interspersed layers (1-10 mm thick) or as solid masses (〉 150 mm thick). The hydrates have gas:fluid ratios as high as 170:1 at STP, C1/(C2 + C3) ratios ranging from 1.9 to 〉 1000 and d13C ratios from -43 to -71 per mil. Thermogenic gas hydrates are associated with oil-stained cores containing up to 7% extractable oil exhibiting moderate to severe biodegradation. Biogenic gas hydrates are also associated with elevated bitumen levels (10-700 ppm). All gas hydrate associated cores contain high percentages (up to 65%) of authigenic, isotopically light carbonate. The hydrate-containing cores are associated with seismic "wipeout" zones indicative of gassy sediments. Collapsed structures, diapiric crests, or deep faults on the flanks of diapirs appear to be the sites of the shallow hydrates.
    Keywords: 96-618_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; DSDP; Garden-Banks-388; Glomar Challenger; Green-Canyon-184; Green-Canyon-204; Green-Canyon-234; Green-Canyon-257; Green-Canyon-320; Gulf of Mexico/BASIN; Leg96; Mississippi-Canyon; PC; Piston corer
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 7
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    (Table 3) Molecular compositions of the occluded hydrate of the Gulf of Mexico sediments
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 96-618_Site; C1/(C2+C3) hydrocarbon ratio; C1 hydrocarbons; C2 hydrocarbons; C3 hydrocarbons; Carbon dioxide; COMPCORE; Composite Core; Deep Sea Drilling Project; DEPTH, sediment/rock; DSDP; Event label; Garden-Banks-388; Glomar Challenger; Green-Canyon-184; Green-Canyon-204; Green-Canyon-234; Green-Canyon-257; Green-Canyon-320; Gulf of Mexico/BASIN; Isobutane per total halocarbons; Leg96; Mississippi-Canyon; n-Propane per total halocarbons; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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  • 8
    Electronic Resource
    Electronic Resource
    ELASTIC REDATUMING OF MULTICOMPONENT SEISMIC DATA (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 40 (1992), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Elastic redatuming can be carried out before or after decomposition of the multicomponent data into independent PP, PS, SP, and SS responses. We argue that from a practical point of view, elastic redatuming is preferably applied after decomposition. We review forward and inverse extrapolation of decomposed P- and S-wavefields. We use the forward extrapolation operators to derive a model of discrete multicomponent seismic data. This forward model is fully described in terms of matrix manipulations.By applying these matrix manipulations in reverse order we arrive at an elastic processing scheme for multicomponent data in which elastic redatuming plays an essential role. Finally, we illustrate elastic redatuming with a controlled 2D example, consisting of simulated multicomponent seismic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1992.tb00537.x
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Role of step-flow dynamics in interface roughening and in the spontaneous formation of InGaAs/InP wire-like arrays (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 611-613 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate a morphological instability that causes an InGaAs/InP multiquantum well structure grown on a vicinal (001) InP surface to spontaneously evolve into an array of InGaAs quasi-one-dimensional filaments buried in an InP matrix. To explain this behavior, we propose a step-flow growth model involving different lateral growth velocities for heteroepitaxy and homoepitaxy. A computer simulation based on the model agrees closely with the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103613
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  • 10
    Electronic Resource
    Electronic Resource
    Nearly ideal electronic surfaces on naked In0.53Ga0.47As quantum wells (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1002-1004 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have discovered that hydroxide-coated In0.53Ga0.47Ag has the lowest known surface recombination velocity of any III-V semiconductor. To demonstrate the excellent electronic quality of such interfaces, we have measured the quantum shifts in the room-temperature luminescence spectrum of "naked'' In0.53Ga0.47As quantum wells (i.e., quantum wells with one face uncovered) in the thickness range 15–50 A(ring). These nearly ideal electronic surfaces should allow the fabrication of lateral quantum confinement structures that operate at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99226
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    Paper (German National Licenses)
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