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  • 1
    Publication Date: 2023-06-27
    Keywords: 84-570_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DSDP; Glomar Challenger; Interval Cored; Leg84; Methane; North Pacific/SLOPE; Thickness
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
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  • 2
    Publication Date: 2023-06-27
    Keywords: 84-570_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DSDP; Glomar Challenger; Interval Cored; Leg84; Methane; North Pacific/SLOPE; Thickness
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 3
    Publication Date: 2023-06-27
    Keywords: 84-570_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DSDP; Glomar Challenger; Interval Cored; Leg84; Methane; North Pacific/SLOPE; Thickness
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 4
    Publication Date: 2023-06-27
    Keywords: 84-570_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DSDP; Glomar Challenger; Interval Cored; Leg84; Methane; North Pacific/SLOPE; Thickness
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 5
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    Unknown
    PANGAEA
    Publication Date: 2023-05-12
    Keywords: Area/locality; Conductivity, average; Depth, bottom/max; LATITUDE; LONGITUDE; Method comment; Number; Number of conductivity measurements; Number of temperature data; Sample, optional label/labor no
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 6
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    Unknown
    PANGAEA
    In:  Supplement to: Mathews, Mark A; von Huene, Roland (1985): Site 570 methane hydrate zone. In: von Heune, R; Aubouin, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 84, 773-790, https://doi.org/10.2973/dsdp.proc.84.134.1985
    Publication Date: 2023-06-27
    Description: Deep Sea Drilling Project (DSDP) studies at Site 570 on the landward slope of the Middle America Trench off Guatemala allow for the first time a quantitative estimate of the methane hydrate content in the massive mudstones deposited there. Drilling across the Guatemalan transect on DSDP Legs 67 and 84 has resulted in the greatest number of visual observations of gas hydrate in any marine area. At Site 570, a 1.5-m-long section of massive methane hydrate was unexpectedly cored in an area where none of the usual signs of gas hydrate in seismic records were present. The sediment section is similar to that recovered at the other eight sites off Guatemala, but drilling at Site 570 may have penetrated through a fault zone that provided the space for accumulation of massive gas hydrate. The methane hydrate was analyzed using the following well logs: density, sonic, resistivity, gamma-ray, caliper, neutron porosity, and temperature. The density, sonic, and resistivity logs define a 15-m-thick hydrated zone within which a 4-m-thick nearly pure hydrate section is contained. The methane gas content ranges from 240 m**3 to 1400 m**3 per m**2 of lateral extent; and if the body extends a square kilometer, its total volume of stored gas could be from 240*10**6m**3 to 1400*10**6m**3. Because the acoustic impedance of hydrate calculated from the sonic and density logs shows no anomalous values, the shape and extent of the hydrate body cannot be defined in seismic records. Thus the body is theoretically nonreflective in contrast to the base of the hydrate reflection. The base of the gas hydrate reflection is presumed to be the result of the velocity contrast between sediment containing gas hydrate and sediment containing free gas.
    Keywords: 84-570_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; DSDP; Glomar Challenger; Leg84; North Pacific/SLOPE
    Type: Dataset
    Format: application/zip, 4 datasets
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