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  • 1
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    Thorium and radiocarbon measurements on sediment cores from the Northseast Atlantic (1993)
    PANGAEA
    In:  Supplement to: Thomson, John; Colley, S; Anderson, Robert F; Cook, G T; MacKenzie, Angus; Harkness, Douglas D (1993): Holocene sediment fluxes in the northeast Atlantic from 230Th excess and radiocarbon measurements. Paleoceanography, 8(5), 631-650, https://doi.org/10.1029/93PA01366
    Details
    Publication Date: 2024-02-01
    Description: Radiocarbon and 230Thexcess data from six NE Atlantic box cores are considered. The cores form a transect from the Porcupine Abyssal Plain over the East Thulean Rise to the southern end of Feni Drift. The chronology for the cores is established from bulk sediment carbonate radiocarbon data and reveals that sections exhibiting constant accumulation rates can be identified in all the cores, with rates of 3.0-3.5 cm/kyr on the plain through the Holocene and late Holocene rates of 4.3-6.6 cm/kyr elsewhere. Five out of the six cores show accumulations of more 230Thexcess than is produced in the overlying water column, with the greatest inventories (up to 225% of production) in the cores from the rise and drift. A size fraction comparison between two cores from the plain and rise reveals that the higher overall accumulation rates and 230Thexcess inventories in the off-plain cores are due to an increased fine (〈5 µm) component fraction, whereas the flux of coarser material is similar to that received on the plain. This suggests that the higher fluxes of materials observed are physically (rather than biogeochemically) driven and also that drift formation has been continuously active in the late Holocene. Sections of all the cores where regular accumulation is defined by the radiocarbon data are modeled first by a linear radiocarbon age/depth model and second by a constant rain (230Thexcess)0 model prorated for the observed core inventories. These modeling approaches yield historical mass accumulation rate estimates which are generally in reasonable agreement (±30%), but the differences observed appear to be well organized in time rather than random.
    Keywords: BC; Biogeochemical Ocean Flux Study; BOFS; BOFS11880#5; BOFS11881#4; BOFS11882#3; BOFS11884#2; BOFS11886#4; BOFS11889#4; BOFS3C; BOFS4C; BOFS5C; BOFS7C; BOFS8C; BOFS9C; Box corer; D184; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; Northeast Atlantic
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 2
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    (Table 2) Age determination and sedimentation rates from surface sediments (1993)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Age, 14C conventional; Age, dated; BC; Biogeochemical Ocean Flux Study; BOFS; BOFS11880#5; BOFS11881#4; BOFS11882#3; BOFS11884#2; BOFS11886#4; BOFS11889#4; BOFS3C; BOFS4C; BOFS5C; BOFS7C; BOFS8C; BOFS9C; Box corer; Calculated; D184; DEPTH, sediment/rock; Discovery (1962); Elevation of event; Event label; JGOFS; Joint Global Ocean Flux Study; Latitude of event; Longitude of event; Mixing depth; Northeast Atlantic; Sedimentation rate
    Type: Dataset
    Format: text/tab-separated-values, 23 data points
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  • 3
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    (Table 1) Geochemistry of sediment core BOFS4C (1993)
    PANGAEA
    Details
    Publication Date: 2024-05-15
    Keywords: AGE; Age, standard deviation; BC; Biogeochemical Ocean Flux Study; BOFS; BOFS11881#4; BOFS4C; Box corer; Calcium carbonate; Calculated from mass/volume; Coulometrics Carbon Analyzer; D184; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; Northeast Atlantic; Thorium; Thorium, standard deviation; Thorium/Uranium ratio; Thorium/Uranium ratio, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Uranium; Uranium, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 210 data points
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  • 4
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    (Table 1) Geochemistry of sediment core BOFS3C (1993)
    PANGAEA
    Details
    Publication Date: 2024-05-15
    Keywords: AGE; Age, standard deviation; BC; Biogeochemical Ocean Flux Study; BOFS; BOFS11880#5; BOFS3C; Box corer; Calcium carbonate; Calculated from mass/volume; Coulometrics Carbon Analyzer; D184; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; Northeast Atlantic; Thorium; Thorium, standard deviation; Thorium/Uranium ratio; Thorium/Uranium ratio, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Uranium; Uranium, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 210 data points
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  • 5
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    (Table 1) Geochemistry of sediment core BOFS7C (1993)
    PANGAEA
    Details
    Publication Date: 2024-05-15
    Keywords: AGE; Age, standard deviation; BC; Biogeochemical Ocean Flux Study; BOFS; BOFS11884#2; BOFS7C; Box corer; Calcium carbonate; Calculated from mass/volume; Coulometrics Carbon Analyzer; D184; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; Northeast Atlantic; Thorium; Thorium, standard deviation; Thorium/Uranium ratio; Thorium/Uranium ratio, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Uranium; Uranium, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 168 data points
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  • 6
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    (Table 1) Geochemistry of sediment core BOFS5C (1993)
    PANGAEA
    Details
    Publication Date: 2024-05-15
    Keywords: AGE; Age, standard deviation; BC; Biogeochemical Ocean Flux Study; BOFS; BOFS11882#3; BOFS5C; Box corer; Calcium carbonate; Calculated from mass/volume; Coulometrics Carbon Analyzer; D184; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; Northeast Atlantic; Thorium; Thorium, standard deviation; Thorium/Uranium ratio; Thorium/Uranium ratio, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Uranium; Uranium, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 126 data points
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  • 7
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    (Table 1) Geochemistry of sediment core BOFS9C (1993)
    PANGAEA
    Details
    Publication Date: 2024-05-15
    Keywords: AGE; Age, standard deviation; BC; Biogeochemical Ocean Flux Study; BOFS; BOFS11889#4; BOFS9C; Box corer; Calcium carbonate; Calculated from mass/volume; Coulometrics Carbon Analyzer; D184; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; Northeast Atlantic; Thorium; Thorium, standard deviation; Thorium/Uranium ratio; Thorium/Uranium ratio, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Uranium; Uranium, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 231 data points
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  • 8
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    (Table 1) Geochemistry of sediment core BOFS8C (1993)
    PANGAEA
    Details
    Publication Date: 2024-05-15
    Keywords: AGE; Age, standard deviation; BC; Biogeochemical Ocean Flux Study; BOFS; BOFS11886#4; BOFS8C; Box corer; Calcium carbonate; Calculated from mass/volume; Coulometrics Carbon Analyzer; D184; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; Northeast Atlantic; Thorium; Thorium, standard deviation; Thorium/Uranium ratio; Thorium/Uranium ratio, standard deviation; Thorium-230; Thorium-230, standard deviation; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Uranium; Uranium, standard deviation; Uranium-234; Uranium-234, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 210 data points
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  • 9
    Electronic Resource
    Electronic Resource
    Palaeolimnology of the Upper Lerma Basin, Central Mexico: a record of climatic change and anthropogenic disturbance since 11 600 yr BP (1991)
    Springer
    Journal of paleolimnology 5 (1991), S. 197-218 
    Details
    ISSN: 1573-0417
    Keywords: palaeolimnology ; Quaternary ; diatoms ; Mexico ; climatic change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The Upper Río Lerma valley, Estado de México, is a high-altitude (2575 m a.s.l.) basin floored by Quaternary alluvial, lacustrine and pyroclastic deposits. Two pits were dug in the swampy bed of the recently drained L. Chiconahuapan. Ten 14C dates have been obtained from these profiles, which consist of diatomaceous organic lake muds and peats with intercalated tephras. The oldest unit is the Upper Toluca Pumice (Tripartite Ash), dated 11 580±70 yr BP. Analyses of sediment chemistry, loss-onignition, mineral-magnetic variations and subfossil diatom assemblages provide evidence of environmental changes since this date. Alkaline ponds or freshwater lakes developed during the intervals 9000–6000, 6000–5500, 3600–1400 and 800–0 yr BP, and acidic marshes or bogs during the intervening dry episodes. An important phase of accelerated erosion, beginning around 3100 yr BP and culminating around 1400–700 yr BP, appears to have been associated with human disturbance of the basin soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00200345
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  • 10
    Electronic Resource
    Electronic Resource
    AMS radiocarbon dating of organic fractions from varved lake sediments: an empirical test of reliability (1997)
    Springer
    Journal of paleolimnology 18 (1997), S. 87-91 
    Details
    ISSN: 1573-0417
    Keywords: radiocarbon ; AMS ; organic fractions ; late Holocene ; varves ; chronology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Replicate cores of annually laminated (varved) sediments have been used to test the accuracy and precision of chronologies of lake sediment accumulation over the last 1000 years, based on AMS 14C measurements. The internally consistent results show that in the case of the soft-water lake sediments studied (Kassjön, northern Sweden), all the organic fractions that include aquatic components give significantly older dates than expected. Only the single terrestrial macrofossil and the fine, unidentified residual particulate fraction provide dates close to the true age of the sediments. The results also show that age discrepancies for some fractions are not constant over time. The age discrepancies may arise from some carbon reservoir effect within the aquatic ecosystem, from resuspension and focusing of older marginal organic material into the deepest part of the lake or from some combination of these processes. More work is needed on the 14C ‘age’ of organic fractions in varve-dated sediments from a range of lake types.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007985119922
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    Paper (German National Licenses)
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