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  • 2000-2004  (23)
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  • 1
    Electronic Resource
    Electronic Resource
    Wave-influenced deltas: geomorphological implications for facies reconstruction (2003)
    Oxford, UK : Blackwell Science Ltd
    Sedimentology 50 (2003), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A process-based facies model for asymmetric wave-influenced deltas predicts significant river-borne muds with potentially lower quality reservoir facies in prodelta and downdrift areas, and better quality sand in updrift areas. Many ancient barrier-lagoon systems and ‘offshore bars’ may be better reinterpreted as components of large-scale asymmetric wave-influenced deltaic systems. The proposed model is based on a re-evaluation of several modern examples. An asymmetry index A is defined as the ratio between the net longshore transport rate at the mouth (in m3 year−1) and river discharge (in 106 m3 month−1). Symmetry is favoured in deltas with an index below ≈ 200 (e.g. Tiber, lobes of the Godavari delta, Rosetta lobe of the Nile, Ebro), whereas deltas with a higher index are asymmetric (e.g. Danube – Sf. Gheorghe lobe, Brazos, Damietta lobe of the Nile). Periodic deflection of the river mouth for significant distances in the downdrift direction occurs in extreme cases of littoral drift dominance (e.g. Mahanadi), resulting in a series of randomly distributed, quasi-parallel series of sand spits and channel fills. Asymmetric deltas show variable proportions of river-, wave- and tide-dominated facies both among and within their lobes. Bayhead deltas, lagoons and barrier islands form naturally in prograding asymmetric deltas and are not necessarily associated with transgressive systems. This complexity underlines the necessity of interpreting ancient depositional systems in a larger palaeogeographic context.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3091.2003.00545.x
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    Paper (German National Licenses)
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  • 2
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    Wave-influenced deltas: geomorphological implications for facies reconstruction (2003)
    Wiley
    Details
    Publication Date: 2003-02-01
    Print ISSN: 0037-0746
    Electronic ISSN: 1365-3091
    Topics: Geosciences
    Published by Wiley
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  • 3
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    Paleoceanographic significance of sediment color on western North Atlantic Drifts: II. Late Pliocene–Pleistocene sedimentation (2002)
    Elsevier
    Details
    Publication Date: 2002-09-01
    Print ISSN: 0025-3227
    Electronic ISSN: 1872-6151
    Topics: Geosciences
    Published by Elsevier
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  • 4
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    Paleoceanographic significance of sediment color on western North Atlantic drifts: I. Origin of color (2002)
    Elsevier
    Details
    Publication Date: 2002-09-01
    Print ISSN: 0025-3227
    Electronic ISSN: 1872-6151
    Topics: Geosciences
    Published by Elsevier
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  • 5
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    Migration history of a fine-grained abyssal sediment wave on the Bahama Outer Ridge (2002)
    Elsevier
    Details
    Publication Date: 2002-12-01
    Print ISSN: 0025-3227
    Electronic ISSN: 1872-6151
    Topics: Geosciences
    Published by Elsevier
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  • 6
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    Drilling to investigate extreme environmental changes (2004)
    American Geophysical Union
    Details
    Publication Date: 2004-01-01
    Print ISSN: 0096-3941
    Electronic ISSN: 2324-9250
    Topics: Geosciences
    Published by American Geophysical Union
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  • 7
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    (Table 1) Upper Carboniferous spores abundances from ODP Holes 172-1062B, 172-1063A and 172-1063B (2002)
    PANGAEA
    In:  Supplement to: Giosan, Liviu; Flood, Roger D; Gruetzner, Jens; Mudie, Peta J (2002): Paleoceanographic significance of sediment color on western North Atlantic Drifts: II. Late Pliocene-Pleistocene sedimentation. Marine Geology, 189(1-2), 43-61, https://doi.org/10.1016/S0025-3227(02)00322-5
    Details
    Publication Date: 2024-01-09
    Description: Color variations were interpreted in paleoceanographic terms for the late Pliocene-Pleistocene sediments recovered by ODP Leg 172 on deep-sea drifts at Blake-Bahama Outer Ridge and northeastern Bermuda Rise. The color-derived parameters used in interpretation included predicted carbonate content, terrigenous fluxes, and hematite content. Abundance of Upper Carboniferous spores indicates that the hematite is probably derived from the Permo-Carboniferous red beds of the Canadian Maritimes. In the last 800 kyr sedimentation pattern changes on the Blake-Bahama Outer Ridge were determined by the sediment delivery to the deep basin as well as circulation changes. Sediment delivery increased during glacials (especially during the last 500 kyr and particularly since Stage 6). A fundamental change in the thermohaline circulation occurred at about 500 ka corresponding to the end of the Mid-Pleistocene Transition period at the onset of the predominant 100-kyr climate cyclicity. Sedimentation related to WBUC had intensified at that time and had become more focused at depths below 3000 m. Changes in hematite content and sedimentation rate show a pulse of sediment via the St. Lawrence outlet at the Pliocene-Pleistocene boundary suggesting that a likely change in the hydrography/physiography of the Laurentide Ice Sheet could have been involved in the climatic and ocean circulation changes at that time.
    Keywords: 172-1062B; 172-1063A; 172-1063B; Age, maximum/old; Age, minimum/young; Apiculatisporis; Blake-Bahama Outer Ridge, North Atlantic Ocean; Color description; Converrucosisporites; Counting, palynology; Densosporites; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Florinites; Joides Resolution; Laevigatosporites; Leg172; Leiotriletes; Lophotriletes; Lycospora; Murospora; Ocean Drilling Program; ODP; Punctatisporites; Sample code/label; Smear slide analysis; Spores indeterminata; Total counts; Triquitrites; Verrucosisporites
    Type: Dataset
    Format: text/tab-separated-values, 126 data points
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  • 8
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    (Table T1) Calcium carbonate content of sediments from ODP Leg 172 sites (2001)
    PANGAEA
    In:  Supplement to: Giosan, Liviu; Flood, Roger D; Gruetzner, Jens; Franz, Sven-Oliver; Poli, Maria-Serena; Hagen, Sveinung (2001): High-resolution carbonate content estimated from diffuse spectral reflectance for Leg 172 sites. In: Keigwin, LD; Rio, D; Acton, GD; Arnold, E (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 172, 1-12, https://doi.org/10.2973/odp.proc.sr.172.210.2001
    Details
    Publication Date: 2024-01-09
    Description: Visual-domain diffuse reflectance data collected aboard the JOIDES Resolution with the Minolta spectrometer CM-2002 during Ocean Drilling Program Leg 172 have been used to estimate successfully the carbonate content of sediments. Calibration equations were developed for each site and for each lithostratigraphic unit (or subunit at Site 1063) using multiple linear regression on raw as well as pretreated reflectance spectra (i.e., first-order derivation and squaring of raw reflectance spectra) for a total of 4141 direct carbonate measurements. The root-mean-square errors of 4% to 7% are within the range of previous estimates using diffuse reflectance data and are acceptable for the general extensive range of carbonate contents (i.e., 0-70 wt%) that characterize sedimentation at Leg 172 sites.
    Keywords: 172-1057B; 172-1061C; 172-1061D; 172-1062E; 172-1062F; 172-1063A; 172-1063B; Blake-Bahama Outer Ridge, North Atlantic Ocean; Blake Outer Ridge, North Atlantic Ocean; Calcium carbonate; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Joides Resolution; Latitude of event; Leg172; Longitude of event; Ocean Drilling Program; ODP; Sample code/label; Spectrophotometer Minolta CM-2002
    Type: Dataset
    Format: text/tab-separated-values, 166 data points
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  • 9
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    (Table 1) Color, Fe-C-S chemistry and carbonate content from ODP Sites 172-1062 and 172-1063 (2002)
    PANGAEA
    In:  Supplement to: Giosan, Liviu; Flood, Roger D; Aller, Robert C (2002): Paleoceanographic significance of sediment color on western North Atlantic drifts: I. Origin of color. Marine Geology, 189(1-2), 25-41, https://doi.org/10.1016/S0025-3227(02)00321-3
    Details
    Publication Date: 2024-01-09
    Description: Reflectance spectra collected during ODP Leg 172 were used in concert with solid phase iron chemistry, carbonate content, and organic carbon content measurements to evaluate the agents responsible for setting the color in sediments. Factor analysis has proved a valuable and rapid technique to detect the local and regional primary factors that influence sediment color. On the western North Atlantic drifts, sediment color is the result of primary mineralogy as well as diagenetic changes. Sediment lightness is controlled by the carbonate content while the hue is primarily due to the presence of hematite and Fe2+/Fe3+ changes in clay minerals. Hematite, most likely derived from the Permo-Carboniferous red beds of the Canadian Maritimes, is differentially preserved at various sites due to differences in reductive diagenesis and dilution by other sedimentary components. Various intensities for diagenesis result from changes in organic carbon content, sedimentation rates, and H2S production via anaerobic methane oxidation. Iron monosulfides occur extensively at all high sedimentation sites especially in glacial periods suggesting increased high terrigenous flux and/or increased reactive iron flux in glacials.
    Keywords: 172-1062D; 172-1062E; 172-1063A; Blake-Bahama Outer Ridge, North Atlantic Ocean; Carbon, organic, total; Carbonates; Color, C*; Color, Hue; Color, L*, lightness; Coulometry; Dithionite extraction (Lord, 1980, PhD Thesis Univ Delaware); DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHN, Carlo Erba; Event label; Factor 1; Factor 2; Factor 3; Iron; Iron, colorimetric, Ferrozine (Stookey, 1970); Joides Resolution; Leg172; Ocean Drilling Program; ODP; Sample code/label; Spectrophotometer Perkin-Elmer Lambda 6; Sulfur, total
    Type: Dataset
    Format: text/tab-separated-values, 343 data points
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  • 10
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    (Table 1) Sediment wave layer summary in ODP Holes 172-1062E-F (2002)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 172-1062; AGE; Blake-Bahama Outer Ridge, North Atlantic Ocean; Calculated, see reference(s); Comment; COMPCORE; Composite Core; Depth, logging; interpolated; Joides Resolution; Leg172; Ocean Drilling Program; ODP; Two-way traveltime; Visual stratigraphy
    Type: Dataset
    Format: text/tab-separated-values, 39 data points
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