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  • 2020-2024  (61)
  • 1990-1994  (22)
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  • 1
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    Unknown
    An astronomically dated record of Earth's climate and its predictability over the last 66 million years (2021)
    AAAS
    Details
    Publication Date: 2023-10-26
    Description: Much of our understanding of Earth's past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states-Hothouse, Warmhouse, Coolhouse, Icehouse-are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.
    Description: Published
    Description: 1383–1387
    Description: 5A. Ricerche polari e paleoclima
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 2
    Electronic Resource
    Electronic Resource
    Molecules record sea change (1992)
    [s.l.] : Nature Publishing Group
    Nature 356 (1992), S. 385-386 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] LONG-CHAIN (Q^-Q^) alkenones are organic molecular fossils from a class of phytoplankton which can be used to create a record of sea surface temperature from marine sediment deposits. Eglinton et al. on page 423 of this issue1 have used this technique to produce a 650,000-year record ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/356385a0
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
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    An astronomically dated record of Earth’s climate and its predictability over the last 66 Million Years (2020)
    AAAS (American Association for the Advancement of Science)
    Details
    Publication Date: 2023-02-08
    Description: Much of our understanding of Earth’s past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states—Hothouse, Warmhouse, Coolhouse, Icehouse—are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Biogenic barium flux in the eastern equatorial Pacific Ocean (2020)
    PANGAEA
    Details
    Publication Date: 2023-02-08
    Description: We present the first regional-scale records of biogenic Barium (xsBa) fluxes in the Panama basin of the eastern-equatorial margin of the Pacific Ocean in order to assess xsBa as a paleoproductivity proxy. Measurements of xsBa from thirteen cores that range in water depths from about 700 ¬¬to 3000 m show an increase in 230Th normalized xsBa mass accumulation rates (MARs) with increasing water depth during both Marine Oxygen Isotope Stages (MIS) 1 and 2. The correlation of xsBa MARs with depth are strong despite differences in bulk sediment mass accumulation rates and differing degrees of sediment redistribution. We interpret the increasing xsBa with water depth as likely due to the continued decomposition and remineralization of falling and/or resuspended biogenic particles. xsBa does not seem to be affected by diagenetic sulfate reduction in most of the cores. Calculated estimates of xsBa preservation in the sediment pile are high and fluctuate between 45% - 52% throughout the last 25 kyr. Although xsBa fluxes can be a robust indicator of paleoproductivity, caution is needed if a) there is evidence of sulfate reduction in sediments being analyzed, and b) one is trying to quantify differences in paleoproductivity among sites that are located at different depths in the water column.
    Keywords: 230Th; AGE; Aluminium; authigenic Uranium (Uauth); Barite dissolution; Barium; Barium excess; Biogenic Barium (xsBa); DEPTH, sediment/rock; Eastern Equatorial Pacific Ocean; Event label; Latitude of event; Longitude of event; Melville; MUC; MultiCorer; MV1014; MV1014-01-1MC; MV1014-01-7MC; MV1014-02-16MC; MV1014-02-9MC; paleoproductivity; Panama Basin
    Type: Dataset
    Format: text/tab-separated-values, 124 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Unknown
    Benthic foraminiferal and bulk sediment stable isotope records, and carbonate content records from the eastern equatorial Pacific, and a reconstruction of the calcite compensation depth, across the EO (2023)
    PANGAEA
    Details
    Publication Date: 2023-08-22
    Description: The major Cenozoic shift from a shallow (~3‒4 km) to deep (~4.5 km) calcite compensation depth (CCD) occurred at the Eocene-Oligocene Transition (EOT; ~34 Ma), suggesting a strong relationship between calcium carbonate (CaCO3) cycling and Antarctic glaciation. To further investigate the linkages between these two events, detailed records of deep-sea carbonate content, and bulk sediment and benthic foraminiferal stable isotope records are needed. This dataset contains bulk sediment stable isotope and carbonate content records from eight sites in the eastern equatorial Pacific (ODP Leg 199 and IODP Expedition 320). These records were used to reconstruct the depth of the calcite compensation depth (CCD) across the Eocene-Oligocene Transition. The projected depth of the CCD is included in this dataset. In addition, this dataset contains a monospecific epifaunal benthic foraminiferal stable isotope stratigraphy from IODP Expedition 320 Site U1334, in the eastern equatorial Pacific, across the Eocene-Oligocene Transition.
    Keywords: CCD; Eocene-Oligocene Transition; IODP Exp. 320; ODP Leg 199
    Type: Dataset
    Format: application/zip, 23 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Chemical composition of manganese crusts dredged near the Galapagos Rift (Pleiades Leg 2 cruise of R/V Melville) (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: The samples analysed were dredged on Pleiades Leg II during a program of heat flow measurements, bottom photography and coring. They are located on topographic mounds in a band 20 km south of the Galapagos Rift on sediments ranging from 20 to 30 m in thickness. The dredge hauls were sampled to represent the diversity of dredged material either Mn encrusted altered basalt or relatively thick Mn coating deposited directly in contact with sediments. Each sample was analysed by atomic absorption spectrophotometry for major elemnts and instrumental neutron activation analysis for minor elements or rare earths.
    Keywords: Aluminium; Antimony; Arsenic; Atomic absorption spectrophotometry; Barium; Calcium; Cerium; Chromium; Cobalt; Copper; Deposit type; Dredge, pipe; DRG_P; Elevation of event; Europium; Event label; Geochemistry; Hafnium; Identification; Instrumental neutron activation analysis (INAA); Iron; Lanthanum; Latitude of event; Longitude of event; Lutetium; Magnesium; Manganese; manganese micronodule; manganese nodule; Melville; Minerals; Neodymium; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; PLDS02MV-003D; PLDS02MV-004D; PLDS02MV-005D; PLDS02MV-007D; PLDS-2; Pleiades; Potassium; Samarium; Scandium; sediment; Silicon; Sodium; Substrate type; Terbium; Thorium; Ytterbium; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 467 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Unknown
    Radiochemical data for a manganese nodule sample from the MN7601-PLEIADES campaign (R/V Melville) (2023)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Using radiochemical methods, the authors have measured the distribution of uranium, thorium, radium, polonium and protactinium isotopes from the top and bottom sides of the a manganese nodule from Station 20 of the PLEIADES Mn7601 campaign. This "apple" shaped nodule (6.5x3.0 cm) was laying on a bed of siliceous ooze (see illustrations). Successive thin layers of the nodule were carefully scraped from the surface of the measured area with a sharp surgical blade. All samples reduced to powder were air-dried at 110°C for at least two hours before analysis. The relative gross alpha activities from each layer were assayed by Alpha spectrometry using a thick-source counting in a scintillation counter.
    Keywords: Alpha spectrometry; BC; Box corer; Deposit type; DEPTH, sediment/rock; DISTANCE; Distance, maximum; Distance, minimum; Elevation of event; Event label; Geochemistry; Identification; Latitude of event; Longitude of event; manganese micronodule; manganese nodule; Melville; MN76-01, Pleiades; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; PLDS04MV-109BX; PLDS-4; Polonium-210; Protactinium-231; Protactinium-231 excess; Protactinium-231 excess, standard deviation; Radium-226; Sample type; sediment; Thorium-228; Thorium-230; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Uranium-234; Uranium-238
    Type: Dataset
    Format: text/tab-separated-values, 218 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Microprobe analysis of a manganese nodule sample from the MN7601-PLEIADES campaign (R/V Melville) (2023)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: The authors have selected for analysis a manganese nodule from Station 20 of the PLEIADES Mn7601 campaign. This "apple" shaped nodule (6.5x3.0 cm) was laying on a bed of siliceous ooze (see illustrations). Electron microprobe measurements were made on the same section as that used in the alpha-track studies. Prior to the microprobe analyses, however, the nodule slab was highly polished to reduce surface relief A MAC electron microprobe was employed and the electron beam was focused to a dmmeter of about 2 micrometers using 15 kV and 300 mA.
    Keywords: Aluminium oxide; Barium oxide; BC; Box corer; Calcium oxide; Cobalt oxide; Copper(II) oxide; Deposit type; DEPTH, sediment/rock; Distance; Elevation of event; Event label; Geochemistry; Identification; Iron oxide, Fe2O3; Latitude of event; Longitude of event; Magnesium oxide; Manganese dioxide; manganese micronodule; manganese nodule; Melville; Microprobe; MN76-01, Pleiades; Nickel oxide; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; PLDS04MV-109BX; PLDS-4; Potassium oxide; Sample type; sediment; Silicon dioxide; Sodium oxide; Titanium dioxide
    Type: Dataset
    Format: text/tab-separated-values, 543 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
    facet.materialart.
    Unknown
    Chemical composition of a manganese nodule sample from the MN7601-PLEIADES campaign (R/V Melville) (2023)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: The authors have selected for analysis a manganese nodule from Station 20 of the PLEIADES Mn7601 campaign. This "apple" shaped nodule (6.5x3.0 cm) was laying on a bed of siliceous ooze (see illustrations). Successive thin layers of the nodule were carefully scraped from the surface of the measured area with a sharp surgical blade. All samples reduced to powder were air-dried at 110°C for at least two hours before analysis. The chemical composition of (1) the top 3-5 mm, (2) the bottom 3-5 mm, and (3) the bulk nodule from a section of Mn7601-20-2 adjacent to the portion used for the radiochemical studies was determined by atomic absorption and neutron activation analysis.
    Keywords: Aluminium; Antimony; Atomic absorption spectrophotometry; Barium; BC; Box corer; Calcium; Cerium; Cobalt; Copper; Deposit type; DEPTH, sediment/rock; DISTANCE; Elevation of event; Europium; Event label; Geochemistry; Hafnium; Holmium; Identification; Iron; Lanthanum; Latitude of event; Longitude of event; Lutetium; Manganese; manganese micronodule; manganese nodule; Melville; MN76-01, Pleiades; Neodymium; Neutron activation analysis; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Pacific Ocean; PLDS04MV-109BX; PLDS-4; Samarium; Sample type; Scandium; sediment; Silicon; Terbium; Thorium; Uranium; Ytterbium; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 81 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    CCD projection based on carbonate accumulation records from the eastern equatorial Pacific (2023)
    PANGAEA
    Details
    Publication Date: 2023-08-22
    Keywords: Age; Astronomically calibrated age model modified after Westerhold et al. (2014); CCD; DEPTH, sediment/rock; Eocene-Oligocene Transition; IODP Exp. 320; ODP Leg 199
    Type: Dataset
    Format: text/tab-separated-values, 1001 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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