de.pangaea.dataset696416 und dataset PANGAEA

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https://www.pangaea.de/ information pointOfContact 2026-05-01T04:32:11Z https://doi.pangaea.de/10.1594/PANGAEA.696416 1982-01-01 publication https://doi.org/10.1594/PANGAEA.696416 Hein, James R

jhein@usgs.gov

author Koski, Randolph A author Morgenson, Lisa A author PANGAEA

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https://www.pangaea.de/ information publisher tableDigital Supplement to: Hein, James R; Koski, Randolph A; Morgenson, Lisa A (1982): Uranium and thorium enrichment in rocks from the base of DSDP Hole 465A, Hess Rise, Central North Pacific. Chemical Geology, 36(3-4), 237-251, https://doi.org/10.1016/0009-2541(82)90050-X Uranium and thorium are concentrated in Cretaceous limestone, chert, ash, basalt, and other rock types at Deep Sea Drilling Project Site 465 located on the southern Hess Rise in the central North Pacific. U concentrations, up to 194 ppm on a carbonate-free basis, are among the highest recorded for any deep-sea deposits. U was initially derived from seawater and concentrated by absorption on terrigenous (humic) organic matter in limestone in a shallow marine environment. U and Th were probably concentrated further by low-temperature hydrothermal fluids emanating from the basaltic basement. Mainly montmorillonite, an alteration product of basalt and ash, and organic matter in sedimentary rocks acted as hosts for U and Th. The unique combination of sediments rich in humic organic matter, abundant smectite in altered ash and basalt, and warm hydrothermal solutions provided the necessary conditions for migration and concentration of U and Th. To better understand the conditions limiting the migrating and concentration of U and Th, other rocks deposited during the ocean-wide Cretaceous anoxic events should be analyzed for these elements. completed Hein, James R

jhein@usgs.gov

principalInvestigator DSDP Deep Sea Drilling Project theme 1995-01-01 creation PANGAEA

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https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation 178.919 178.919 33.8205 33.8205 1978-08-23T00:00:00 1978-08-23T00:00:00 392.8 419.5 In the sample 465A-40-1, 145 (calcareous ash / sulfide-rich fraction) contents of major oxides were measured by quantitative emission spectroscopy; in the samples 465A-40-2, 62 (altered ash) and 465A-40-2, 62 (altered ash, <1 µm fraction) contents of major oxides were measured by semi-quantitative emission spectroscopy. DEPTH, sediment/rock physicalMeasurement m m Sample code/label thematicClassification DSDP/ODP/IODP sample designation Rock type thematicClassification Lithology/composition/facies thematicClassification Minerals thematicClassification major Minerals thematicClassification moderate Minerals thematicClassification minor Minerals thematicClassification trace Silicon dioxide physicalMeasurement X-ray fluorescence on pressed powder % % Aluminium oxide physicalMeasurement X-ray fluorescence on pressed powder % % Titanium dioxide physicalMeasurement X-ray fluorescence on pressed powder % % Iron oxide, Fe2O3 physicalMeasurement X-ray fluorescence on pressed powder; total Fe as Fe2O3 % % Magnesium oxide physicalMeasurement X-ray fluorescence on pressed powder % % Calcium oxide physicalMeasurement X-ray fluorescence on pressed powder % % Sodium oxide physicalMeasurement X-ray fluorescence on pressed powder % % Potassium oxide physicalMeasurement X-ray fluorescence on pressed powder % % Phosphorus pentoxide physicalMeasurement X-ray fluorescence on pressed powder % % Barium oxide physicalMeasurement X-ray fluorescence on pressed powder % % Sulfite physicalMeasurement 3 by difference on barite-rich samples % % Manganese physicalMeasurement X-ray fluorescence on pressed powder mg/kg mg/kg Loss on ignition physicalMeasurement at 1050°C % % Sum physicalMeasurement Calculated % % Carbon, organic, total physicalMeasurement Element analyser CHN, LECO WR-12 % % Calcium carbonate physicalMeasurement Element analyser CHN, LECO WR-12 % % Uranium physicalMeasurement Element analysis, neutron activation (NAA) mg/kg mg/kg Thorium physicalMeasurement Element analysis, neutron activation (NAA); differences in detection limits are due to dilutions required to complete the analysis mg/kg mg/kg text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.696416?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: 62-465A * LATITUDE: 33.820500 * LONGITUDE: 178.919000 * DATE/TIME: 1978-08-23T00:00:00 * ELEVATION: -2161.0 m * PENETRATION: 476 m * RECOVERY: 98.9 m * LOCATION: North Pacific/CONT RISE * CAMPAIGN: Leg62 * BASIS: Glomar Challenger * METHOD/DEVICE: Drilling/drill rig 43 cores; 408.5 m cored; 9.5 m drilled; 24.2 % recovery 1978-08-23T00:00:00