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  • Data  (64)
  • 1
    Publication Date: 2018-09-27
    Type: Dataset
    Format: text/tab-separated-values, 81 data points
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  • 2
    Publication Date: 2018-09-27
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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  • 3
    Publication Date: 2018-09-27
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 4
    Publication Date: 2018-09-27
    Type: Dataset
    Format: text/tab-separated-values, 309 data points
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  • 5
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    PANGAEA
    In:  Supplement to: Wetzel, Andreas (1990): Consolidation characteristics and permeability of Bengal Fan sediments drilled during Leg 116. In: Cochran, JR; Stow, DAV; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 116, 363-368, https://doi.org/10.2973/odp.proc.sr.116.145.1990
    Publication Date: 2018-09-27
    Description: The state of consolidation of outer Bengal Fan deposits is closely related to their depositional history. Early Pleistocene sediments are underconsolidated, i.e., fabric strength is lower than under equilibrium with the present overburden stress, at depths greater than 60-80 mbsf. This may be due to rapid accumulation (〉15-20 cm/k.y.) and overlying low-permeability (〈10**-7 cm/s) deposits. The underlying Pliocene sediments are overconsolidated, i.e., fabric strength is higher than in equilibrium with the present overburden stress; at Sites 717 and 719 the sediments are slightly overconsolidated, whereas at Site 718 the overconsolidation is significant. Overconsolidation is explained by erosion that occurred during the early Pleistocene for which a stratigraphic gap was recorded in the drilled cores. The eroded section is estimated to be in the range of 10-40 m at Sites 717 and 719, respectively, and 130-150 m at Site 718. Below 250-300 mbsf the most sediments are normally consolidated. The amount of erosion seems to be related to block rotation and uplift due to intraplate deformation.
    Type: Dataset
    Format: text/tab-separated-values, 351 data points
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  • 6
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    PANGAEA
    In:  Supplement to: Bölter, Manfred; Blume, Hans-Peter; Wetzel, Holger (2006): Properties, formation, classification and ecology of Aarctic soils: results from the Tundra Northwest Expedition 1999 (Nunavut and Northwest Territories, Canada). Polarforschung, 73(2/3), 89-101, hdl:10013/epic.29914.d001
    Publication Date: 2019-04-16
    Description: Soils of Arctic Canada were sampled during the Tundra Northwest Expedition 1999 (TNW-99) at 17 sites that cover the ecological regions of the High, Mid and Low Arctic zones. Almost all locations consisted of a mesic and a dry habitat and are described with respect to their ecological function. Analyses on soil characteristics were performed for soil morphology, texture and chemistry. The data showed a wide variability due to local aspects. Statistical evidence did not indicate that larger-than-local ecological regions could be defined in most cases by either soil chemical characteristics or vegetation patterns. Soil classification according to the World Reference Base of Soils (WRB) showed the dominance of different Cryosols, but also Gelic Cambisols and Gelic Regosols were found; according to US Soil Taxonomy, they could be classified as different Orthels, Turbels and Histels. Low temperature, high stone content and low nutrient availability were noted as factors hampering plant growth and soil activity.
    Type: Dataset
    Format: text/tab-separated-values, 1157 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Bryant, William; Wetzel, Andreas; Sweet, William (1986): Geotechnical properties of Intraslope Basin sediments, Gulf of Mexico, Deep Sea Drilling Project Leg 96, Site 619. 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, 819-824, https://doi.org/10.2973/dsdp.proc.96.153.1986
    Publication Date: 2018-09-27
    Description: Geotechnical examination of 180 m of core recovered in Pigmy Basin at Site 619 in the Gulf of Mexico indicates that excess pore-water pressures are present in the lower section of the hole. Shear strength-vertical effective stress relationships and consolidation testing (oedometer) indicate that the sediments are normally consolidated in the upper 30 m and underconsolidated below. The presence of gas within the pore waters greatly affected the measurements of shear strength, water content, and porosity in the interval between 80 and 160 m sub-bottom.
    Type: Dataset
    Format: text/tab-separated-values, 102 data points
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  • 8
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    PANGAEA
    In:  Supplement to: Ratschbacher, Lothar; Wetzel, Andreas; Brokmeier, Heinz-Günter (1994): A neutron goniometer study of the preferred orientation of calcite in fine-grained deep-sea carbonate. Sedimentary Geology, 89(3-4), 315-324, https://doi.org/10.1016/0037-0738(94)90100-7
    Publication Date: 2019-02-13
    Description: In weakly indurated, nannofossil-rich, deep-sea carbonates compressional wave velocity is up to twice as fast parallel to bedding than normal to it. It has been suggested that this anisotropy is due to alignment of calcite c-axes perpendicular to the shields of coccoliths and shield deposition parallel to bedding. This hypothesis was tested by measuring the preferred orientation (fabric) of calcite c-axes in acoustic anisotropic, calcareous DSDP sediment samples by X-ray goniometry, and it was found that the maximum c-axis concentrations are by far too low to explain the anisotropies. The X-ray method is subject to a number of uncertainties due to preparatory and technical shortcomings in weakly indurated rocks. The most serious weaknesses are: sample preparation, volume of measured sample (fraction of a mm3), beam defocusing and background intensity corrections, combination of incomplete pole figures, and necessity of recalculation of the c-axis orientations from other crystallographic directions. Goniometry using thermal neutrons overcomes most of these difficulties, but it is time consuming. We test the interferences made about velocity anisotropy by X-ray studies about the concentration of c-axes in deep-sea carbonates by employing neutron texture goniometry to eight DSDP samples comprising mostly nannofossil material. Fabric and sonic velocity were determined directly on the core specimens, thus from the same rock volume and requiring no preparation. The c-axis orientation is obtained directly from the [0006] calcite diffraction peak without corrections. The fabrics are clearly defined, but weak (1.1 to 1.86 times uniform) with the maximum about normal to bedding. They have crudely orthorhombic symmetry, but are not axisymmetric around the bedding normal. The observed c-axis intensities, although higher than determined by the X-ray method on other samples, are by far too low to explain the observed acoustic anisotropies.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 9
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    PANGAEA
    In:  Supplement to: Bryant, William; Wetzel, Andreas; Taylor, Elliott; Sweet, William (1986): Consolidation characteristics and permeability of Mississippi Fan sediments. 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, 797-809, https://doi.org/10.2973/dsdp.proc.96.151.1986
    Publication Date: 2019-02-13
    Description: Geotechnical properties of Quaternary sediments from the middle and lower regions of the Mississippi Fan show that the sediments are normally to overly consolidated to a depth of 40 to 50 m below the seafloor. Below that depth, the sediments become highly underconsolidated and exhibit high excess pore-water pressures. The state of underconsolidation is attributed to the rapid rates of sediment accumulation and the low permeability of smectite-rich clays.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 10
    Publication Date: 2019-02-11
    Type: Dataset
    Format: text/tab-separated-values, 17 data points
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