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  • 1
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    Palaeoceanographic data of sediment core MD01-2416
    PANGAEA
    In:  Supplement to: Maier, Edith; Chapligin, Bernhard; Abelmann, Andrea; Gersonde, Rainer; Esper, Oliver; Ren, Jian; Friedrichsen, Hans; Meyer, Hanno; Tiedemann, Ralf (2013): Combined oxygen and silicon isotope analysis of diatom silica from a deglacial subarctic Pacific record. Journal of Quaternary Science, 28(6), 571-581, https://doi.org/10.1002/jqs.2649
    Details
    Publication Date: 2023-05-12
    Description: We present an SiF4 separation line, coupled to a laser fluorination system, which allows for an efficient combined silica d18O and d30Si analysis (50 min per sample). The required sample weight of 1.5-2.0 mg allows for high-resolution isotope studies on biogenic opal. Besides analytical tests, the new instrumentation set-up was used to analyse two marine diatom fractions (〉63 µm, 10-20 µm) with different diatom species compositions extracted from a Bølling/Allerød-Holocene core section [MD01-2416, North-West (NW) Pacific] to evaluate the palaeoceanographic significance of the diatom isotopic signals and to address isotopic effects related to contamination and species-related isotope effects (vital and environmental effects). While d30Si offsets between the two fractions were not discernible, supporting the absence of species-related silicon isotope effects, systematic offsets occur between the d18O records. Although small, these offsets point to species-related isotope effects, as bias by contamination can be discarded. The new records strengthen the palaeoceanographic history during the last deglaciation in the NW Pacific characterized by a sequence of events with varying surface water structure and biological productivity. With such palaeoceanographic evolution it becomes unlikely that the observed systematic d18O offsets signal seasonal temperature variability. This calls for reconsideration of vital effects, generally excluded to affect d18O measurements.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 5 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink, supplementary datasets (2015)
    PANGAEA
    In:  Supplement to: Abelmann, Andrea; Gersonde, Rainer; Knorr, Gregor; Zhang, Xu; Chapligin, Bernhard; Maier, Edith; Esper, Oliver; Friedrichsen, Hans; Lohmann, Gerrit; Meyer, Hanno; Tiedemann, Ralf (2015): The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink. Nature Communications, 6, 8136, https://doi.org/10.1038/ncomms9136
    Details
    Publication Date: 2023-03-30
    Description: Reduced surface-deep ocean exchange and enhanced nutrient consumption by phytoplankton in the Southern Ocean have been linked to lower glacial atmospheric CO2. However, identification of the biological and physical conditions involved and the related processes remains incomplete. Here we specify Southern Ocean surface-subsurface contrasts using a new tool, the combined oxygen and silicon isotope measurement of diatom and radiolarian opal, in combination with numerical simulations. Our data do not indicate a permanent glacial halocline related to melt water from icebergs. Corroborated by numerical simulations, we find that glacial surface stratification was variable and linked to seasonal sea-ice changes. During glacial spring-summer, the mixed layer was relatively shallow, while deeper mixing occurred during fall-winter, allowing for surface-ocean refueling with nutrients from the deep reservoir, which was potentially richer in nutrients than today. This generated specific carbon and opal export regimes turning the glacial seasonal sea-ice zone into a carbon sink.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 12 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Supplementary Table 2) Vertical abundances of the radiolarian species Actinomma antarctica and Spongotrochus glacialis from four plankton stations (2015)
    PANGAEA
    Details
    Publication Date: 2023-03-30
    Keywords: Actinomma antarctica; ANT-IX/4; Atlantic Ridge; AWI_Paleo; Depth, bottom/max; Depth, top/min; DEPTH, water; Discovery Seamount; Event label; MSN; Multiple opening/closing net; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS18; PS18/259; PS18/261; PS18/263; PS18/265; PS2101-2; PS2103-3; PS2105-4; PS2107-2; Spongotrochus glacialis
    Type: Dataset
    Format: text/tab-separated-values, 59 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Oxygen and hydrogen isotopes at DSDP Leg 65 Holes
    PANGAEA
    In:  Supplement to: Hoernes, Stephan; Friedrichsen, Hans (1983): Oxygen isotopic composition of basalts from Leg 65, Deep Sea Drilling Project. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 661-665, https://doi.org/10.2973/dsdp.proc.65.132.1983
    Details
    Publication Date: 2023-06-27
    Description: In order to provide information on the degree of alteration of the very young basaltic basement drilled on Leg 65 in the mouth of the Gulf of California, we have measured the oxygen isotopic composition of whole rocks and mineral separates. Considerable data already exist for older ocean crust, in particular for the deep holes drilled in the Atlantic Ocean on Deep Sea Drilling Project (DSDP) Legs 37, 45, 46, and 51-53. These data indicate that in all of these holes, which include crust as young as 3.5 m.y. old, a significant amount of alteration has taken place as the result of low-temperature interaction between basalt and seawater (cf. Muehlenbachs, 1977, 1980; Hoernes et al., 1978; Friedrichsen and Hoernes, 1980). It is therefore of interest to determine whether Leg 65 crust, which is only 0.5 to 1.5 m.y. old, has experienced a similar degree of alteration.
    Keywords: 65-482B; 65-482D; 65-483; 65-483B; 65-485A; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg65; North Pacific/Gulf of California/CONT RISE; North Pacific/Gulf of California/SEDIMENT POND
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    87Sr/86Sr ratios, Sr and Rb concentrations and stable oxygen isotope values for some basalts from ODP Hole 504B (Table 1)
    PANGAEA
    In:  Supplement to: Barrett, T J; Friedrichsen, Hans (1982): Strontium and oxygen isotopic composition of some basalts from Hole 504B, Costa Rica Rift, DSDP Legs 69 and 70. Earth and Planetary Science Letters, 60(1), 27-38, https://doi.org/10.1016/0012-821X(82)90017-6
    Details
    Publication Date: 2023-06-27
    Description: Seventeen whole-rock samples, generally taken at 25-50 m intervals from 5 to 560 m sub-basement in Hole 504B, drilled in 6.2 m.y. old crust, were analysed for 87Sr/86Sr ratios, Sr and Rb concentrations, and 18O/16O ratios. Sr isotope ratios for 8 samples from the upper 260 m of the hole range from 0.70287 to 0.70377, with a mean of 0.70320. In the 330-560 m interval, 5 samples have a restricted range of 0.70255-0.70279, with a mean of 0.70266, the average value for fresh mid-ocean ridge basalts (MORB). In the 260-330 m interval, approximately intermediate Sr isotopic ratios are found. Delta18O values (‰) range from 6.4 to 7.8 in the upper 260 m, 6.2-6.4 in the 270-320 m interval, and 5.8-6.2 in the 320-560 m interval. The values in the upper 260 m are typical for basalts which have undergone low-temperature seawater alteration, whereas the values for the 320-560 m interval correspond to MORB which have experienced essentially no oxygen isotopic alteration. The higher 87Sr/86Sr and 18O/16O ratios in the upper part of the hole can be interpreted as the result of a greater overall water/rock ratio in the upper part of the Hole 504B crust than in the lower part. Interaction of basalt with seawater (87Sr/86Sr = 0.7091) increased basalt 87Sr/86Sr ratios and produced smectitic alteration products which raised whole-rock delta18O values. Seawater circulation in the lower basalts may have been partly restricted by the greater number of relatively impermeable massive lava flows below about 230 m sub-basement. These flows may have helped to seal off lower basalts from through-flowing seawater.
    Keywords: 69-504B; 70-504B; Alteration; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope ratio mass spectrometry; Leg69; Leg70; Lithology/composition/facies; ORDINAL NUMBER; Rubidium; Sample code/label; Sample code/label 2; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Water in rock; X-ray fluorescence (XRF); δ18O
    Type: Dataset
    Format: text/tab-separated-values, 153 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    (Table 3) Geochemistry of individual nontronite granules (6-10 mm diameter) at DSDP Holes 70-507D and 70-509B
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 70-507D; 70-509B; Aluminium oxide; Calcium oxide; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Event label; Glomar Challenger; Identification; Iron oxide, Fe2O3; Leg70; Magnesium oxide; Manganese oxide; North Pacific/MOUND; Potassium oxide; Ratio; Sample code/label; Silicon dioxide; Sodium oxide; Total
    Type: Dataset
    Format: text/tab-separated-values, 192 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    (Table 1) Geochemistry of adjacent nontronite granules from a stratigraphically shallow nontronite DSDP Sample 70-509B-2-1,44-48
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 70-509B; Aluminium oxide; Calcium oxide; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Glomar Challenger; Identification; Iron oxide, Fe2O3; Leg70; Magnesium oxide; Manganese oxide; North Pacific/MOUND; Potassium oxide; Ratio; Sample code/label; Silicon dioxide; Sodium oxide; Total
    Type: Dataset
    Format: text/tab-separated-values, 120 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    (Table 5) Rare-earth element contents of metalliferous and pelagic sediments at DSDP Leg 70 Holes
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 70-506; 70-506B; 70-507D; 70-507F; 70-509B; Cerium; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Europium; Event label; Gadolinium; Glomar Challenger; Holmium; Instrumental neutron activation analysis (INAA); Lanthanum; Latitude of event; Leg70; Lithology/composition/facies; Longitude of event; Lutetium; Neodymium; North Pacific/MOUND; Samarium; Sample code/label; Sample ID; Terbium; Ytterbium
    Type: Dataset
    Format: text/tab-separated-values, 195 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    (Table 4) Geochemistry of Mn-oxide crust fragments from DSDP Holes 70-507D and 70-509B
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 70-507D; 70-509B; Aluminium oxide; Calcium oxide; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Event label; Glomar Challenger; Identification; Iron oxide, FeO; Leg70; Magnesium oxide; Manganese oxide; North Pacific/MOUND; Potassium oxide; Ratio; Sample code/label; Silicon dioxide; Sodium oxide; Total
    Type: Dataset
    Format: text/tab-separated-values, 91 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    (Table 2) Hydrogen isotopes for selected whole rock samples at DSDP Leg 65 Holes
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 65-482B; 65-482D; 65-483; 65-483B; 65-485A; Bromine pentafluoride procedure (Clayton and Mayeda, 1963); Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Latitude of event; Leg65; Longitude of event; North Pacific/Gulf of California/CONT RISE; North Pacific/Gulf of California/SEDIMENT POND; Sample code/label; Sample ID; δ Deuterium
    Type: Dataset
    Format: text/tab-separated-values, 27 data points
    Location Call Number Limitation Availability
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