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  • 1
    Electronic Resource
    Electronic Resource
    Petrogenesis and 230Th-238U disequilibrium at Mt. Shasta, California, and in the Cascades (1986)
    Springer
    Contributions to mineralogy and petrology 93 (1986), S. 195-206 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Petrogenesis at Mt. Shasta is dominated by mixing of magmas and/or assimilation of wall rock, as is shown by petrographic, major and trace element chemistry, and 238U-230Th disequilibrium data. At least three end- members are involved in these mixing processes. Lavas of very young Cascades lavas, from Mt. Garibaldi in the north to Lassen Peak in the south, are characterized by a large range of thorium isotopic ratios, although series of samples from single volcanoes are characterized by approximately constant (230Th/232Th). There is a monotonic decrease in this ratio from Crater Lake south through Lassen Peak, perhaps reflecting increasing thickness of the underlying crust. Th/U fractionation in Cascades lavas, as evidenced by (230Th/238U)≥ 1, is in the opposite sense to that in most island arc lavas. This trend suggests that fluid transport, which is thought to produce uranium enrichment in island arc, is lacking or somehow modified in the petrogenesis of the Cascades lavas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371321
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    Paper (German National Licenses)
    Fulltext
  • 2
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    (Table 2) Separated phases from Mid-Indian Ocean Ridge samples
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: AGE; LATITUDE; LONGITUDE; Sample code/label; Sample comment; Uranium; Uranium, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
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  • 3
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    (Table 1) Uranium chemistry of oceanic basalt whole rock samples
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 22-213; 24-238; AGE; Comment; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Fission-track; Glomar Challenger; Indian Ocean//BASIN; Indian Ocean//FRACTURE ZONE; LATITUDE; Leg22; Leg24; LONGITUDE; Radiochemical analysis after Ku, Broecker (1969); Sample code/label; Uranium; Uranium, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
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  • 4
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    (Table 2) K/U ratios of altered basalts
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 22-213; 5-39; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Indian Ocean//BASIN; Leg22; Leg5; North Pacific/HILL; Potassium/Uranium ratio; Potassium oxide; Sample code/label; Uranium
    Type: Dataset
    Format: text/tab-separated-values, 16 data points
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  • 5
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    (Table 1) Uranium concentrations of basalts
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 16-163; 18-177A; 2-10; 22-211; 22-213; 22-215; 23-220; 24-231; 24-236; 24-238; 25-240; 34-319; 34-320; 5-32; 5-36; 5-37; 5-39; Age, maximum/old; Age, minimum/young; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Estimated; Event label; Fission-track; Glomar Challenger; Indian Ocean//BASIN; Indian Ocean//FRACTURE ZONE; Indian Ocean/Arabian Sea/HILL; Indian Ocean/Gulf of Aden/BASIN; Latitude of event; Leg16; Leg18; Leg2; Leg22; Leg23; Leg24; Leg25; Leg34; Leg5; Longitude of event; North Atlantic/CONT RISE; North Pacific/CONT RISE; North Pacific/HILL; North Pacific/PLAIN; North Pacific/RIDGE; Sample code/label; South Pacific/BASIN; Uranium; Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 216 data points
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  • 6
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    Uranium chemistry of oceanic basalts
    PANGAEA
    In:  Supplement to: MacDougall, J Douglas; Finkel, R C; Carlson, J; Krishnaswami, Seth (1979): Isotopic evidence for uranium exchange during low-temperature alteration of oceanic basalt. Earth and Planetary Science Letters, 42(1), 27-34, https://doi.org/10.1016/0012-821X(79)90187-0
    Details
    Publication Date: 2023-06-27
    Description: Measurements of uranium concentration and the 234U/238 U activity ratio in oceanic basalts which have undergone low-temperature seafloor alteration indicate that uranium uptake is a pervasive occurrence but that the various phases involved behave differently with respect to this process. Palagonite exhibits uranium contents 8-20 times higher than unaltered glass coupled with low 234U/238U, suggesting ongoing preferential leaching of 234U. Altered crystalline interiors of several old basalts have 234U/238U 〉 1, indicative of recent uranium exchange with seawater. The data also provide evidence for uranium sources with 234U/238U higher than the seawater value of 1.14. Manganese crusts on basalts of a variety of ages have isotopic ratios indicating that they either are recent deposits or also have experienced continuing uranium exchange with seawater.
    Keywords: 22-213; 24-238; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean//BASIN; Indian Ocean//FRACTURE ZONE; Leg22; Leg24
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    Uranium in marine basalts
    PANGAEA
    In:  Supplement to: MacDougall, J Douglas (1977): Uranium in marine basalts: Concentration, distribution and implications. Earth and Planetary Science Letters, 35(1), 65-70, https://doi.org/10.1016/0012-821X(77)90029-2
    Details
    Publication Date: 2023-06-27
    Description: The uranium content of glass from chilled margins of oceanic tholeiitic basalt flows is generally 〈0.1 ppm, even for old samples with highly altered crystalline interiors. Such low values represent the original whole rock concentrations, although subsequent to eruption low-temperature weathering has added uranium, and other elements, to the crystalline portions of these basalts. Consideration of the K/U ratios of altered samples suggests that basalt weathering may provide the major oceanic sink for these two elements.
    Keywords: 16-163; 18-177A; 2-10; 22-211; 22-213; 22-215; 23-220; 24-231; 24-236; 24-238; 25-240; 34-319; 34-320; 5-32; 5-36; 5-37; 5-39; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean//BASIN; Indian Ocean//FRACTURE ZONE; Indian Ocean/Arabian Sea/HILL; Indian Ocean/Gulf of Aden/BASIN; Leg16; Leg18; Leg2; Leg22; Leg23; Leg24; Leg25; Leg34; Leg5; North Atlantic/CONT RISE; North Pacific/CONT RISE; North Pacific/HILL; North Pacific/PLAIN; North Pacific/RIDGE; South Pacific/BASIN
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    (Table 1) Chemical and isotopic analyses of Rajmahal Traps and Ninetyeast Ridge volcanics
    PANGAEA
    In:  Supplement to: Mahoney, John J; MacDougall, J Douglas; Lugmair, G W; Gopalan, K (1983): Kerguelen hotspot source for Rajmahal Traps and Ninetyeast Ridge? Nature, 303(5916), 385-389, https://doi.org/10.1038/303385a0
    Details
    Publication Date: 2023-06-27
    Description: The hypothesis that hotspots are the sources of many continental flood basalts is evaluated geochemically for the proposed Rajmahal Traps-Ninetyeast Ridge-Kerguelen hotspot system. It appears that the Kerguelen hotspot did not directly feed Rajmahal magmas, although it may have provided a source of heat for Rajmahal activity.
    Keywords: 22-214; 22-216; 26-253; 26-254; Aluminium oxide; Barium; Calcium oxide; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Event label; Glomar Challenger; HAND; Indian Ocean//RIDGE; Iron oxide, FeO; Isotope dilution; Leg22; Leg26; Magnesium oxide; Neodymium; Nickel; Niobium; Phosphorus pentoxide; Potassium; Rajmahal_Traps; Rubidium; Samarium; Sample code/label; Sampling by hand; Silicon dioxide; Sodium oxide; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Titanium dioxide; Vanadium; Yttrium; Zirconium; ε-Neodymium, standard deviation; ε-Neodymium (T)
    Type: Dataset
    Format: text/tab-separated-values, 546 data points
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  • 9
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    (Table 1, pages 779) Alpha track determination of growth rates of manganese nodules, Pacific Ocean (1979)
    PANGAEA
    In:  Supplement to: MacDougall, J Douglas (1979): The distribution of total alpha radioactivity in selected manganese nodules from the North Pacific: implications for growth processes. In: Bischoff, J.L., Piper, D.Z. (Eds.), Marine Geology and Oceanography of the Pacific Manganese Nodule Province, Marine Science. Plenum Publishing Corporation, New York, U.S.A., 775-790, https://doi.org/10.1007/978-1-4684-3518-4_25
    Details
    Publication Date: 2023-08-28
    Description: Analyses of the total alpha radioactivity distribution in 31 North Pacific manganese nodules yield an average growth rate of 6.8 ( 2) mm /m.y. Samples from a single box core show almost identical total activity vs. depth profiles, regardless of nodule size or shape. A characteristic feature of many nodules examined is an apparent change (steepening) in slope of the alpha activity profile between depths of 0.5-1.5 mm. This feature may reflect a fundamental feature of nodule growth, possibly mobility of 230Th or its daughters in a regular way, interrupted growth, or nodule turnover. Near-surface decreases in total alpha activity probably result from 226Ra loss.
    Keywords: Agassiz; Argo; BC; Box corer; Core; CORE; Deposit type; DEPTH, sediment/rock; DNWB0ABD; DOMES Site C, Pacific Ocean; DOWNWIND-B1; Dredge; Dredge, bucket; DRG; DRG_BU; DSV-53P-8; DWBD1; Elevation of event; Event label; EXPL60-14D; EXPL60-4; Explorer; FFGR; Free-fall grab; GC; Grab; GRAB; Gravity corer; Growth rate; Growth rate, standard deviation; Horizon; Identification; Latitude of event; Longitude of event; MDPC01HO-005-02; MDPC01HO-016-01; Melville; Method/Device of event; MIDPAC; Mn-74-02-13B-D-001; Mn-74-02-13B-FFG-008; Mn-74-02-16-FFG-037; Mn-74-02 IDOE DOMES; MN76-01, Pleiades; Moana Wave; MONS01AR-MONS08AR; MONS08AR-150G; MONSOON; MPC-16-1; MPC-5-2; MSN-150G; MW7402; MW7402-13D01; MW7402-13G08; MW7402-16G37; NEL-14; NEL-4; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Oceanographer; Pacific Ocean; Photo/Video; PLDS04MV-109BX; PLDS-4; PV; RISEPAC; RISP-4PG; RP6OC75; RP6OC75-25-51; Sample code/label; SCR-MN-61; SCR-MN-68; SCR-MN-70; SCR-MR-55; SCR-MR-A17875; Seascope Expedition; Seattle-Norfolk_1960; Size; Spencer F. Baird; SS72/5; SS72-111DB; STYX_II; STYX02AZ; STYXII-48FF; TC; TRAWL; Trawl net; Trigger corer; Vityaz (ex-Mars); Vityaz-29; VITYAZ4221-TR
    Type: Dataset
    Format: text/tab-separated-values, 164 data points
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  • 10
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    Radiochemical data for a manganese nodule sample from the MN7601-PLEIADES campaign (R/V Melville) (2023)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Using radiochemical methods, the authors have measured the distribution of uranium, thorium, radium, polonium and protactinium isotopes from the top and bottom sides of the a manganese nodule from Station 20 of the PLEIADES Mn7601 campaign. This "apple" shaped nodule (6.5x3.0 cm) was laying on a bed of siliceous ooze (see illustrations). Successive thin layers of the nodule were carefully scraped from the surface of the measured area with a sharp surgical blade. All samples reduced to powder were air-dried at 110°C for at least two hours before analysis. The relative gross alpha activities from each layer were assayed by Alpha spectrometry using a thick-source counting in a scintillation counter.
    Keywords: Alpha spectrometry; BC; Box corer; Deposit type; DEPTH, sediment/rock; DISTANCE; Distance, maximum; Distance, minimum; Elevation of event; Event label; Geochemistry; Identification; Latitude of event; Longitude of event; manganese micronodule; manganese nodule; Melville; MN76-01, Pleiades; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; PLDS04MV-109BX; PLDS-4; Polonium-210; Protactinium-231; Protactinium-231 excess; Protactinium-231 excess, standard deviation; Radium-226; Sample type; sediment; Thorium-228; Thorium-230; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Uranium-234; Uranium-238
    Type: Dataset
    Format: text/tab-separated-values, 218 data points
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