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  • 1
    Electronic Resource
    Electronic Resource
    Freshwater chlorophycean algae in recent marine sediments of the Beaufort, Laptev and Kara Seas (Arctic Ocean) as indicators of river runoff (2000)
    Springer
    International journal of earth sciences 89 (2000), S. 470-485 
    Details
    ISSN: 1437-3262
    Keywords: Arctic Ocean Beaufort Sea Laptev Sea Kara Sea Recent sediments Chlorophyte distribution Freshwater discharge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract. Freshwater chlorophycean algae are characteristic organic-walled microfossils in recent coastal and shelf sediments from the Beaufort, Laptev and Kara seas (Arctic Ocean). The persistent occurrence of the chlorophycean algae Pediastrum spp. and Botryococcus cf. braunii in marine palynomorph assemblages is related to the discharge of freshwater and suspended matter from the large Siberian and North American rivers into the Arctic shelf seas. The distribution patterns of these algae in the marine environments reflect the predominant deposition of riverine sediments and organic matter along the salinity gradient from the outer estuaries and prodeltas to the shelf break. Sedimentary processes overprint the primary distribution of these algae. Resuspension of sediments by waves and bottom currents may transport sediments in the bottom nepheloid layer along the submarine channels to the shelf break. Bottom sediments and microfossils may be incorporated into sea ice during freeze-up in autumn and winter leading to an export from the shelves into the deep sea. The presence of these freshwater algae in sea-ice and bottom sediments in the central Arctic Ocean confirm that transport in sea ice is an important process which leads to a redistribution of shallow water microfossils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310000127
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    Paper (German National Licenses)
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  • 2
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    Unknown
    (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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    DATA PANGAEA
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