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  • 1
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    Stable isotopes, counts and raw element data of Globorotalia inflata from sediment cores, Southwest Atlantic (2020)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-03
    Beschreibung: Sedimentary specimens of the planktonic foraminifera Globorotalia inflata can provide much needed information on subsurface conditions of past oceans. However, interpretation of its geochemical signal is complicated by possible effects of cryptic diversity and encrustation. Here we address these issues using plankton tow and sediment samples from the western South Atlantic, where the two genotypes of G. inflata meet at the Brazil-Malvinas Confluence Zone. The δ18O and δ13C of encrusted specimens from both genotypes from a core within the confluence zone are indistinguishable. However, we do find a large influence of encrustation on δ18O and Mg/Ca. Whereas crust Mg/Ca ratios are at all locations lower than lamellar calcite, the crust effect on δ18O is less consistent in space. Plankton tows show that encrusted specimens occur at any depth and that even close to the surface crust Mg/Ca ratios are lower than in lamellar calcite. This is inconsistent with formation of the crust at lower temperature at greater depth. Instead we suggest that the difference between the crust and lamellar calcite Mg/Ca ratio is temperature-independent and due to the presence of high Mg/Ca bands only in the lamellar calcite. The variable crust effect on δ18O is more difficult to explain, but the higher incidence of crust free specimens in warmer waters and the observation that a crust effect is clearest in the confluence zone, hint at the possibility that the difference reflects advective mixing of specimens from warmer and colder areas, rather than vertical migration.
    Schlagwort(e): Center for Marine Environmental Sciences; MARUM
    Materialart: Dataset
    Format: application/zip, 3 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 2
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    Minor element profiles through Globorotalia inflata shells from cores GeoB6209-2, GeoB6220-1, GeoB6311-2, GeoB2722-1 and plankton tows MP11 (M133-34-1), MP13 (M133-56-1), MP17 (M133-65-1) (2020)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-03
    Beschreibung: Measurement were conducted using a NewWave UP193 solid-state laser coupled to a Thermo‐Finnigan Element2 HR-ICP-MS at the Department of Geosciences, University of Bremen. Isotope abundances of 25Mg, 27Al, 43Ca, 55Mn, 57Fe and 87Sr in foraminifera shells were determined at an irradiance of 1.3 GW cm-2, a laser pulse rate of 5 Hz and a spot size of 50–100 μm. Plasma power was 1200 W, and Helium (0.7 L min-1) and Argon (0.9 L min-1) were used as sample and make-up gases, respectively. All isotopes were analysed at low resolution with five samples in a 20% mass window and a total dwell time of 25 ms per isotope. Blanks were measured for 30 s prior to ablation and every analysis was followed by a wash out time of at least 60 s to avoid cross-contamination between samples. A glass reference material (NIST610) was measured before every five ablation spots as an external calibration standard using the values of Jochum et al. (2011). To assess data quality, a pressed pellet of MACS-3 carbonate standard powder (n=4) and the USGS reference material BHVO‐2G (n=18) were analysed as control standards along with the samples. External precision is better than 3.9%, and accuracy as determined by comparison of our reference material data with the GeoReM database (as of July 2020) is better than 3.4% for all elements except for Mg (7.7%). The 43Ca isotope was used as an internal standard. The files contain raw and despiked element counts, calibration factors and calibrated element/calcium ratios.
    Schlagwort(e): Center for Marine Environmental Sciences; MARUM
    Materialart: Dataset
    Format: application/zip, 3.8 MBytes
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 3
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    Counts of Globorotalia inflata genotypes in core GeoB13862-1 (2020)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): 496; AGE; Center for Marine Environmental Sciences; counting 300-1000 µm fraction; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; GC; GeoB13862-1; Globorotalia inflata; Gravity corer; M78/3B; MARUM; Meteor (1986)
    Materialart: Dataset
    Format: text/tab-separated-values, 280 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    Stable O and C isotopes of Globorotalia inflata in sediment cores GeoB6209-2, GeoB6220-1, GeoB13862-1, GeoB6311-2, GeoB2722-1 (2020)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Beschreibung: Measurements were performed on groups of 3 shells in core GeoB13862-1 and on groups of 3-10 shells in the core top samples using a Thermo MAT 253plus coupled to a Kiel IV device at MARUM. Analytical precision was determined through repeat measurements of an in-house carbonate standard (Solnhofen limestone), which was calibrated to the NBS 19 calcite standard, and amounted to 0.06 and 0.03 ‰ for δ18O and δ13C, respectively.
    Schlagwort(e): 496; AGE; Center for Marine Environmental Sciences; Comment; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; GC; Genotype; GeoB13862-1; GeoB2722-1; GeoB6209-2; GeoB6220-1; GeoB6311-2; Giant box corer; GKG; Globorotalia inflata, δ13C; Globorotalia inflata, δ18O; Gravity corer; Latitude of event; Longitude of event; M29/1; M46/2; M46/3; M78/3B; MARUM; Mass spectrometer, Finnigan, MAT 253; coupled with Carbonate preparation device, Finnigan, KIEL IV; Meteor (1986); MUC; MultiCorer; Size fraction, lower threshold; Size fraction, upper threshold; Slope off Argentina; western South Atlantic
    Materialart: Dataset
    Format: text/tab-separated-values, 1568 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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