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Windrose

96 datasets found! (Query time: 4 ms)

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  1. St. John, KEK (2010): (Table 1) Summary of general lithology in IODP Exp302 cores
    Abstract:  The Cenozoic ice-rafted debris (IRD) history of the central Arctic is reconstructed utilizing the terrigenous coarse sand fraction in IODP 302 cores from 0 to 273 meters composite depth. This Holocene - middle Eocene quantitative record of terrigenous sand accumulation on the Lomonosov Ridge, along with qualitative information on grain texture and composition, confirms the interpretation that ice initiation (sea ice and glacial ice) occurred ~46 Ma in the Arctic, and provides a long-term pattern of Arctic ice expansion and decay since the middle Eocene. IRD mass accumulation rates range from 0 to 0.13 g/cm2/ka in the middle Eocene and from 0 to 0.36 g/cm2/ka in the Neogene. IRD mass accumulation rate (MAR) maxima in the Miocene and Pliocene cooccur with either glacial initiation or intensification in the sub-Arctic. […]
    Size:  41 data points
    https://doi.org/10.1594/PANGAEA.734547 - Score: 17.884
  2. Eynaud, F; Cronin, TM; Smith, SA et al. (2009): (Table 1) Late Pleistocene planktonic foraminifera of Hole 302-M0004C
    Abstract:  Planktonic foraminifera populations were studied throughout the top 25 meters of the IODP ACEX 302 Hole 4C from the central Arctic Ocean at a resolution varying from 5cm (at the top of the record) to 10cm. Planktonic foraminifera occur in high absolute abundances only in the uppermost fifty centimetres and are dominated by the taxa Neogloboquadrina pachyderma. Except for a few intermittent layers below this level,most samples are barren of calcareous microfossils.Within the topmost sediments, Neogloboquadrina pachyderma specimens present large morphological variability in the shape and number of chambers in the finalwhorl, chamber sphericity, size, and coiling direction. Five morphotypeswere identified among the sinistral (sin.) population (Nps-1 to Nps-5), including a small form (Nps-5) that is similar to a non-encrusted normal form also previously identified in the modern Arctic Ocean watermasses. […]
    Size:  943 data points
    https://doi.org/10.1594/PANGAEA.672078 - Score: 17.884
  3. Pagani, M; Pedentchouk, N; Huber, M et al. (2006): Stable carbon isotope ratios of alkane of IODP Hole 302-M0004A
    Abstract:  The Palaeocene/Eocene thermal maximum represents a period of rapid, extreme global warming approx ~55 million years ago, superimposed on an already warm world (Zachos et al., 2003, doi:10.1126/science.1090110; Bowen et al., 2004, doi:10.1038/nature03115; Thomas et al., 2002, doi:10.1130/0091-7613(2002)030<1067:WTFFTF>2.0.CO;2). This warming is associated with a severe shoaling of the ocean calcite compensation depth **4 and a >2.5 per mil negative carbon isotope excursion in marine and soil carbonates (Zachos et al., 2003, doi:10.1126/science.1090110; Bowen et al., 2004, doi:10.1038/nature03115; Thomas et al., 2002, doi:10.1130/0091-7613(2002)030<1067:WTFFTF>2.0.CO;2; Zachos et al., doi:10.1126/science.1109004). Together these observations indicate a massive release of 13C-depleted carbon (Zachos et al., doi:10.1126/science.1109004) and greenhouse-gas-induced warming. […]
    Size:  417 data points
    https://doi.org/10.1594/PANGAEA.733130 - Score: 17.884
  4. Sluijs, A; Röhl, U; Schouten, S et al. (2008): (Table 1) Elemental mean values of the upper Paleocene and lower Eocene in IODP Hole 302-M0004A
    Abstract:  We reconstruct the latest Paleocene and early Eocene (~57-50 Ma) environmental trends in the Arctic Ocean and focus on the Paleocene-Eocene thermal maximum (PETM) (~55 Ma), using strata recovered from the Lomonosov Ridge by the Integrated Ocean Drilling Program Expedition 302. The Lomonosov Ridge was still partially subaerial during the latest Paleocene and earliest Eocene and gradually subsided during the early Eocene. Organic dinoflagellate cyst (dinocyst) assemblages point to brackish and productive surface waters throughout the latest Paleocene and early Eocene. Dinocyst assemblages are cosmopolitan during this time interval, suggesting warm conditions, which is corroborated by TEX86'-reconstructed temperatures of 15°-18°C. Inorganic geochemistry generally reflects reducing conditions within the sediment and euxinic conditions during the upper lower Eocene. […]
    Size:  125 data points
    https://doi.org/10.1594/PANGAEA.733796 - Score: 17.651
  5. Cronin, TM; Smith, SA; Eynaud, F et al. (2008): Age determination and stable carbon isotope ratios of Neogloboquadrina pachyderma of IODP Hole 302-M0004C
    Abstract:  The Integrated Ocean Drilling Program (IODP) Arctic Coring Expedition (ACEX) Hole 4C from the Lomonosov Ridge in the central Arctic Ocean recovered a continuous 18 m record of Quaternary foraminifera yielding evidence for seasonally ice-free interglacials during the Matuyama, progressive development of large glacials during the mid-Pleistocene transition (MPT) ~1.2-0.9 Ma, and the onset of high-amplitude 100-ka orbital cycles ~500 ka. Foraminiferal preservation in sediments from the Arctic is influenced by primary (sea ice, organic input, and other environmental conditions) and secondary factors (syndepositional, long-term pore water dissolution). Taking these into account, the ACEX 4C record shows distinct maxima in agglutinated foraminiferal abundance corresponding to several interglacials and deglacials between marine isotope stages (MIS) 13-37, and although less precise dating is available for older sediments, these trends appear to continue through the Matuyama. […]
    Size:  30 data points
    https://doi.org/10.1594/PANGAEA.706303 - Score: 17.515
  6. Martinez, NC; Murray, RW; Dickens, GR et al. (2009): (Table 2a) Major and trace element analysis of sediments from IODP Exp302 sites
    Size:  1088 data points
    https://doi.org/10.1594/PANGAEA.787155 - Score: 16.253
  7. Spofforth, DJA; Pälike, H; Green, DRH (2008): Chemical composition of Eocene sediments of Hole 302-M0002A
    Size:  20790 data points
    https://doi.org/10.1594/PANGAEA.659166 - Score: 16.253
  8. Sluijs, A; Schouten, S; Donders, TH et al. (2010): Stable carbon isotope ratios of IODP Hole 302-M0004A
    Size:  231 data points
    https://doi.org/10.1594/PANGAEA.735703 - Score: 16.253
  9. Gleason, JD; Thomas, DJ; Moore, TC et al. (2012): (Table 1) Eocene fish debris, Nd-Sr isotopic compositions of chemically treated fish debris and H202-leach fractions from IODP Exp 302
    Size:  290 data points
    https://doi.org/10.1594/PANGAEA.787109 - Score: 16.253
  10. Barke, J; van der Burgh, J; van Konijnenburg-van Cittert, JHA et al. (2012): (Table 2) Distinctive microspore massula characteristics of Azolla arctica, Azolla jutlandica, Azolla sp. 1 and Azolla sp. 2
    Size:  62 data points
    https://doi.org/10.1594/PANGAEA.787096 - Score: 16.253

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