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  • 1
    Publication Date: 2023-06-27
    Keywords: 75-532; Age, comment; Age model; Ageprofile Datum Description; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg75; South Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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  • 2
    Publication Date: 2023-06-27
    Keywords: 75-532_Site; Accumulation rate, benthic foraminifera by number; Accumulation rate, calcium carbonate; Accumulation rate, radiolarians by number; Accumulation rate, total organic carbon; AGE; Benthic foraminifera of total foram fauna; Calcium carbonate; Carbon, organic, total; COMPCORE; Composite Core; Counting 〉250 µm fraction; Counting 〉45 µm fraction; Deep Sea Drilling Project; Density, dry bulk; DEPTH, sediment/rock; DSDP; DSDP/ODP/IODP sample designation; Foraminifera, planktic; Foraminifera, planktic, fragments; Glomar Challenger; Leg75; Radiolarian preservation; Radiolarians; Radiolarians, intermediate/radiolarians, warm ratio; Radiolarians, intermediate water depth; Radiolarians, temperate; Radiolarians, upwelling; Radiolarians, warm; Sample code/label; Sedimentation rate; South Atlantic; Uvigerina spp.; Uvigerina spp., δ18O
    Type: Dataset
    Format: text/tab-separated-values, 723 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Lazarus, David B; Bittniok, Beatrice; Diester-Haass, Lieselotte; Meyers, Philip A; Billups, Katharina (2006): Comparison of radiolarian and sedimentologic paleoproductivity proxies in the latest Miocene-Recent Benguela Upwelling System. Marine Micropaleontology, 60(4), 269-294, https://doi.org/10.1016/j.marmicro.2006.06.003
    Publication Date: 2024-01-09
    Description: Estimating past ocean productivity from ocean sediments often gives different results depending on the measurement used. We have examined a suite of paleoproductivity proxies in latest Miocene-Recent sediments from DSDP Site 532 and ODP Site 1084, two deep-sea sections underlying the Benguela Upwelling System off the Atlantic coast of southern Africa. The productivity history of this system has been previously established via organic carbon concentration, diatom floras and alkenone based estimates of surface water temperature, and shows a change from low productivity in the early Pliocene to sustain high productivity in the late Pliocene-Recent. Each of our samples was split and simultaneously analysed for several proxies of ocean productivity, including organic carbon (TOC%), carbonate, abundance of opaline radiolarians, accumulation rate of benthic foraminifera (BFAR); the radiolarian faunal composition indices Upwelling Radiolarian Index (URI) and the Water Depth Ecology index (WADE); other proxies for opal and carbonate dissolution, plus stable isotopes of benthic foraminifera. Comparisons between proxies in the same measured samples, between sites in downcore plots and to the published productivity record for this region suggest that TOC and radiolarian faunal composition, particularly the WADE index, are good indicators of past productivity, albeit with different sensitivities (log-linear correlation WADE-TOC% r=0.78, n=65, p〈0.01). In contrast, carbonate, and carbonatebased proxies such as BFAR primarily reflect changes in dissolution. Radiolarian faunal composition indices do not appear to be affected by bulk opal accumulation or changes in opal preservation. WADE analysis of radiolarian faunas and TOC% measurements appear to be useful proxies for productivity in late Neogene sediments, particularly for sections where opal or carbonate dissolution is significant.
    Keywords: 175-1084A; 75-532; 75-532_Site; Benguela Current, South Atlantic Ocean; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg175; Leg75; Ocean Drilling Program; ODP; South Atlantic
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 4
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    PANGAEA
    In:  Supplement to: Lazarus, David B; Bittniok, Beatrice; Diester-Haass, Lieselotte; Billups, Katharina; Ogawa, Yujiro; Takahashi, Kozo; Meyers, Philip A (2008): Radiolarian and sedimentologic paleoproductivity proxies in late Pleistocene sediments of the Benguela Upwelling System, ODP Site 1084. Marine Micropaleontology, 68(3-4), 223-235, https://doi.org/10.1016/j.marmicro.2008.02.004
    Publication Date: 2024-01-09
    Description: The changing composition of radiolarian faunas from late Neogene deep-sea sediments has been used in recent years as a proxy for changes in marine paleoproductivity. We examine radiolarian faunas, organic carbon content (TOC), opal and coarse-fraction components over the last 270,000 years in sediments from ODP Hole 1084A, drilled in a high productivity upwelling region within the Benguela Upwelling System off the west coast of Africa. Age control is provided by stable oxygen isotope measurements of benthic foraminifera. Prior research has established that late Pleistocene glacial intervals in this upwelling system generally had higher productivity than interglacials. The radiolarian WADE (water-depth ecology) paleoproductivity index correlates well with TOC and opal in these samples, and all three parameters change in synchrony with the benthic isotope curve over all but the MIS 5e–6 time interval. WADE inferred productivity is significantly higher in glacials than interglacials. We conclude that the WADE index is a useful proxy for paleoproductivity at this location, as are also opal and organic carbon accumulation rates. Carbonate and carbonate based indices such as the accumulation rate of benthic foraminifera (BFAR) by contrast do not correlate well either to productivity indices or to the glacial–interglacial cycle, and are interpreted to primarily reflect carbonate dissolution.
    Keywords: 175-1084A; Acanthosphaera corlocae; Accumulation rate, benthic foraminifera by number; Accumulation rate, mass; Acrosphaera murrayana; Actinomma antarcticum; Actinomma boreale; Actinomma leptodermum; Actinomma popofskii; AGE; Amphirhopalum ypsilon; Antarctissa spp.; Anthocyrtidium ophirense; Anthocyrtidium zanguebaricum; Arachnocorys circumtexta; Benguela Current, South Atlantic Ocean; Botryocyrtis scutum; Botryostrobus aquilonaris; Botryostrobus auritus/australis; Calcium carbonate; Calculated; Carbon, organic, total; Carpocaniidae indeterminata; Cladococcus sp.; Cornutella profunda; Counting 〉150 µm fraction; Counting 〉45 µm fraction; Cycladophora bicornis; Cycladophora conica; Cycladophora davisiana; Cyrtopera laguncula; DEPTH, sediment/rock; Dictiocoryne profunda; Dictyophimus crisiae; Dictyophimus infabricatus; Didymocyrtis tetrathalamus; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHNS-O; Eucyrtidium acuminatum; Eucyrtidium calvertense; Eucyrtidium teuscheri group; Heliodiscus asteriscus; Helotholus histricosa; Joides Resolution; Lamprocyclas maritalis; Lamprocyrtis heteroporos; Lamprocyrtis nigriniae; Larcopyle buetschlii; Leg175; Lipmanella dictyoceras; Lithelius minor; Lithomelissa hystrix; Lithomelissa setosa; Lithostrobus hexagonalis; Lophospyris pentagona; Mass spectrometer GV Instruments Isoprime; Ocean Drilling Program; Octopyle stenozona; ODP; Ommatodiscus irregularis; Opal, biogenic silica; Opal, extraction; Mortlock & Froelich, 1989; Peripyramis circumtexta; Phelodinium cranwelliae; Phormospyris stabilis stabilis; Phormostichoartus corbula; Phormostichoartus pitomorphus group; Plectacantha cresmastoplegma; Primary production of carbon; Prunopyle antarctica; Pseudodictyophimus gracilipes; Pterocanium auritum; Pterocanium hirundo group; Pterocanium praetextum praetextum; Pterocanium trilobum; Pterocorys minythorax; Pterocorys zancleus; Radiolarians; Radiolarians, intermediate/radiolarians, warm ratio; Radiolarians, intermediate water depth; Radiolarians, other; Radiolarians, temperate; Radiolarians, upwelling; Radiolarians, warm; Saccospyris antarctica; Sample code/label; Siphocampe arachnea; Spirocyrtis spp.; Spongocore cylindrica; Spongopyle osculosa group; Spongotrochus venustum; Stichocorys peregrina; Theocorys veneris; Theocorythium trachelium; Uvigerina spp.; Uvigerina spp., δ18O; Zygocircus spp.
    Type: Dataset
    Format: text/tab-separated-values, 2976 data points
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  • 5
    Publication Date: 2024-01-09
    Keywords: 175-1084A; Accumulation rate, benthic foraminifera by number; Accumulation rate, calcium carbonate; Accumulation rate, radiolarians by number; Accumulation rate, total organic carbon; AGE; Benguela Current, South Atlantic Ocean; Benthic foraminifera of total foram fauna; Calcium carbonate; Carbon, organic, total; Counting 〉250 µm fraction; Counting 〉45 µm fraction; Density, dry bulk; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Foraminifera, planktic; Foraminifera, planktic, fragments; Joides Resolution; Leg175; Ocean Drilling Program; ODP; Radiolarian preservation; Radiolarians; Radiolarians, intermediate/radiolarians, warm ratio; Radiolarians, intermediate water depth; Radiolarians, temperate; Radiolarians, upwelling; Radiolarians, warm; Sample code/label; Sedimentation rate; Uvigerina spp.; Uvigerina spp., δ18O
    Type: Dataset
    Format: text/tab-separated-values, 725 data points
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