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  • 1
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    Stable isotope from Miocene exceptionally preserved foraminifera from Tanzania (2023)
    PANGAEA
    Details
    Publication Date: 2023-03-10
    Description: The dataset presents oxygen and carbon stable isotopes measured on multispecies planktonic foraminiferal shells and on Cibicidoides spp. and Uvigerina spp. (benthic foraminifera). The data were obtained from three samples from marine deposits outcropping in coastal Tanzania dating back to the early and middle Miocene. The samples are characterized by an exceptionally good preservation of foraminiferal shells.
    Keywords: Age model, Berggren et al (1995) BKSA95; Biostratigraphic zone; Calculated, δ18O; Event label; foraminiferal stable isotopes; Miocene; OUTCROP; Outcrop sample; paleotemperature; RAS99-38; RAS99-42; Site180906/1; Species; Tanzania; Temperature, calculated; δ13C; δ18O
    Type: Dataset
    Format: text/tab-separated-values, 205 data points
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  • 2
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    Boron isotope and Mg/ca ratio of Trilobatus trilobus (2019)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 122-761B; 144-872C; 154-926A; 154-926B; 165-1000A; AGE; Age model, paleomag, Cande and Kent (1992); boron isotopes; carbonate system; Caribbean Sea; Comment; Core; Depth, composite; Depth, description; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Foraminifera; Joides Resolution; Leg122; Leg144; Leg154; Leg165; Miocene; Neogene; North Pacific Ocean; Sample comment; Section; Site; South Atlantic Ocean; South Indian Ridge, South Indian Ocean; Trilobatus trilobus, δ11B; Trilobatus trilobus, δ11B, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 469 data points
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  • 3
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    New composite bio- and isotope stratigraphies spanning the Middle Eocene Climatic Optimum at tropical ODP Site 143-865 in the Pacific Ocean (2020)
    PANGAEA
    Details
    Publication Date: 2023-07-24
    Description: The Middle Eocene Climatic Optimum (MECO) at ca. 40 Ma is one of the largest of the transient Eocene global warming events. However, it is relatively poorly known from tropical settings since few sites span the entirety of the MECO event and/or host calcareous microfossils, which are the dominant proxy carrier for palaeoceanographic reconstructions. Ocean Drilling Program (ODP) Pacific Ocean Site 143-865 in the low-latitude North Pacific (Allison Guyot) has the potential to provide a useful tropical MECO reference but detailed stratigraphic and chronological constraints needed to evaluate its completeness were previously lacking. We have addressed this deficit by generating new high-resolution biostratigraphic, stable isotope and X-ray fluorescence (XRF) records spanning the MECO interval (~38.0-43.0 Ma) in two holes drilled at Site 143-865. XRF-derived strontium/calcium (Sr/Ca) and barium/strontium (Ba/Sr) ratio and Fe count records allow correlation between holes and reveal pronounced rhythmicity, enabling us to develop the first composite section for Holes 143-865B and 143-865C and a preliminary cyclostratigraphy for the MECO. Using this new framework, the sedimentary record is interpreted to be continuous across the event, as identified by a pronounced transient benthic foraminiferal δ¹⁸O shift of ~0.8‰. Calcareous microfossil biostratigraphic events from widely used zonation schemes are recognized, with generally good agreement between the two holes, highlighting the robustness of the new composite section and allowing us to identify planktic foraminiferal Zones E10-E15 and calcareous nannofossil Zones NP15-18. However, discrepancies in the relative position and ordering of several primary and secondary bioevents with respect to published schemes are noted. Specifically, the stratigraphic highest occurrences of planktic foraminifera Acarinina bullbrooki, Guembelitrioides nuttalli, and Morozovella aragonensis, and calcareous nannofossils Chiasmolithus solitus and Sphenolithus furcatolithoides and the lowest occurrence of Reticulofenestra reticulata, all appear higher in the section than would be predicted relative to other bioevents. We also note conspicuous reworking of older microfossils (from planktic foraminiferal Zones E5-E9 and E13) into younger sediments (planktic foraminiferal Zones E14-15) within our study interval consistent with reworking above the MECO interval. Regardless of reworking, the high-quality XRF records enable decimeter scale correlation between holes and highlight the potential of Site 143-865 for constraining tropical environmental and biotic changes, not just across the MECO but also throughout the Paleocene and early-to-middle Eocene interval.
    Type: Dataset
    Format: application/zip, 14 datasets
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  • 4
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    Boron isotope, Mg/Ca, Al/Ca data and reconstructed pH and CO2 concentrations from IODP sites (2020)
    PANGAEA
    Details
    Publication Date: 2023-09-25
    Description: This dataset includes measurements on mixed layer planktonic foraminifera from IODP/ODP sites for boron isotopes and trace elements. Boron isotopes were measured after column chemistry and solution analyses on a Neptune multi collector ICPMS, while trace elements were measured on pre-columned aliquots of the same samples, using Element XR ICP-MS. Furthermore, the dataset includes the seawater pH and atmospheric CO2 calculated from B isotopes measurements and Mg/Ca-temperature estimates, for no-vital effect treatment (T. sac-vital effect corrections at Eocene d11Bsw conditions result in d11B offsets within analytical uncertainty), and no pH correction on Mg/Ca-temperature relationship (assuming T. sac like species). Carbonate system calculations incorporate MyAMI ion-pairing corrections (https://github.com/MathisHain/MyAMI), and surface Omega values specific for the Eocene and the paleo-latitude of the core location. Propagation of uncertainties for pH and CO2 is completed through 1000 Monte Carlo simulations.
    Keywords: 143-865B; 207-1258A; 207-1258B; 207-1258C; 207-1260A; 342-U1407A; 342-U1409B; 342-U1409C; AGE; Aluminium/Calcium ratio; Atmospheric CO2; Carbon dioxide; Carbon dioxide, standard deviation; climate sensitivity; Comment; Core; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Eocene; Event label; Exp342; Foraminifera, planktic δ11B; GMT; Hole; Joides Resolution; Leg143; Leg207; Magnesium/Calcium ratio; North Pacific Ocean; Paleogene Newfoundland Sediment Drifts; pH; pH, standard deviation; Sea surface temperature; Section; Site; Size fraction; South Atlantic Ocean; Species; surface seawater pH; δ11B, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1239 data points
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  • 5
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    Calcium isotopes of planktonic foraminifera (2005)
    PANGAEA
    In:  Supplement to: Heuser, Alexander; Eisenhauer, Anton; Böhm, Florian; Wallmann, Klaus; Gussone, Nikolaus; Pearson, Paul N; Nägler, Thomas F; Dullo, Wolf-Christian (2005): Calcium isotope (d44/40Ca) variations of Neogene planktonic foraminifera. Paleoceanography, 20(2), PA2013, https://doi.org/10.1029/2004PA001048
    Details
    Publication Date: 2024-01-09
    Description: Measurements of the calcium isotopic composition (d44/40Ca) of planktonic foraminifera from the western equatorial Pacific and the Indian sector of the Southern Ocean show variations of about 0.6 per mil over the past 24 Myr. The stacked d44/40Ca record of Globigerinoides trilobus and Globigerina bulloides indicates a minimum in d44/40Casw (seawater calcium) at 15 to 16 Ma and a subsequent general increase toward the present, interrupted by a second minimum at 3 to 5 Ma. Applying a coupled calcium/carbon cycle model, we find two scenarios that can explain a large portion of the observed d44/40Casw variations. In both cases, variations in the Ca input flux to the ocean without proportional changes in the carbonate flux are invoked. The first scenario increases the riverine calcium input to the ocean without a proportional increase of the carbonate flux. The second scenario generates an additional calcium flux from the exchange of Ca by Mg during dolomitization. In both cases the calcium flux variations lead to drastic changes in the seawater Ca concentrations on million year timescales. Our d44/40Casw record therefore indicates that the global calcium cycle may be much more dynamic than previously assumed.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 6
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    (Table 1) Boron-isotope measurements of planktonic and benthic foraminifera of ODP Hole 144-871A (1998)
    PANGAEA
    In:  Supplement to: Palmer, Martin R; Pearson, Paul N; Cobb, S J (1998): Reconstructing Past Ocean pH-Depth Profiles. Science, 282(5393), 1468-1471, https://doi.org/10.1126/science.282.5393.1468
    Details
    Publication Date: 2024-01-09
    Description: Measurement of boron isotope compositions in species of planktonic foraminifera that calcified their tests at different depths in the water column are used to reconstruct the pH profile of the upper water column of the tropical ocean. Results for five time windows from the middle Miocene to the late Pleistocene indicate pH-depth profiles similar to that of the modern ocean in this area, which suggests that this method may greatly aid in our understanding of the global carbon cycle.
    Keywords: 144-871A; Comment; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg144; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Size; Species; δ11B
    Type: Dataset
    Format: text/tab-separated-values, 225 data points
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  • 7
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    (Table 1) Boron-isotope measurements of shallow-dwelling planktonic foraminifera of ODP Holes 144-817A, 144-872C and 143-865C (2000)
    PANGAEA
    In:  Supplement to: Pearson, Paul N; Palmer, Martin R (2000): Atmospheric carbon dioxide concentrations over the past 60 million years. Nature, 406, 695-699, https://doi.org/10.1038/35021000
    Details
    Publication Date: 2024-01-09
    Description: Knowledge of the evolution of atmospheric carbon dioxide concentrations throughout the Earth's history is important for a reconstruction of the links between climate and radiative forcing of the Earth's surface temperatures. Although atmospheric carbon dioxide concentrations in the early Cenozoic era (about 60 Myr ago) are widely believed to have been higher than at present, there is disagreement regarding the exact carbon dioxide levels, the timing of the decline and the mechanisms that are most important for the control of CO2 concentrations over geological timescales. Here we use the boron-isotope ratios of ancient planktonic foraminifer shells to estimate the pH of surface-layer sea water throughout the past 60 million years, which can be used to reconstruct atmospheric CO2 concentrations. We estimate CO2 concentrations of more than 2,000 p.p.m. for the late Palaeocene and earliest Eocene periods (from about 60 to 52 Myr ago), and find an erratic decline between 55 and 40 Myr ago that may have been caused by reduced CO2 outgassing from ocean ridges, volcanoes and metamorphic belts and increased carbon burial. Since the early Miocene (about 24 Myr ago), atmospheric CO2 concentrations appear to have remained below 500 p.p.m. and were more stable than before, although transient intervals of CO2 reduction may have occurred during periods of rapid cooling approximately 15 and 3 Myr ago.
    Keywords: 143-865C; 144-871A; 144-872C; AGE; Age, maximum/old; Age, minimum/young; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg143; Leg144; modelled; North Pacific Ocean; Ocean Drilling Program; ODP; pH; Sample code/label; Size; Species; δ11B; δ11B, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 326 data points
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  • 8
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    (Table 3) Coiling measurements on the Pulleniatina lineage, ODP Hole 144-871A (1995)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 144-871A; Coiling ratio; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg144; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Species
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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  • 9
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    (Table 6) Coiling measurements on the Pulleniatina lineage, ODP Hole 144-872C (1995)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 144-872C; Coiling ratio; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg144; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Species
    Type: Dataset
    Format: text/tab-separated-values, 90 data points
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  • 10
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    (Table 4) Stratigraphic ranges of planktonic foraminifers in ODP Hole 144-872C (1995)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 144-872C; Candeina nitida; Cassigerinella chipolensis; Catapsydrax dissimilis; Catapsydrax unicavus; Chiloguembelina cubensis; Clavatorella bermudezi; Contamination; Dentoglobigerina altispira; Dentoglobigerina baroemoenensis; Dentoglobigerina galavisi; Dentoglobigerina globularis; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Epoch; Fohsella fohsi; Fohsella lobata; Fohsella peripheroacuta; Fohsella peripheroronda; Fohsella praefohsi; Fohsella robusta; Foraminifera, planktic, Cretaceous; Foraminifera, planktic, Eocene; Fragments; Globigerina angulisuturalis; Globigerina bulloides; Globigerina ciperoensis; Globigerina ouachitaensis; Globigerina praebulloides; Globigerina prasaepis; Globigerinatella insueta; Globigerinatella sp.; Globigerinella calida; Globigerinella obesa; Globigerinella praesiphonifera; Globigerinella siphonifera; Globigerinita glutinata; Globigerinita uvula; Globigerinoides altiaperturus; Globigerinoides bisphericus; Globigerinoides conglobatus; Globigerinoides extremus; Globigerinoides fistulosus; Globigerinoides mitra; Globigerinoides obliquus; Globigerinoides primordius; Globigerinoides ruber; Globigerinoides ruber pink; Globigerinoides sacculifer; Globigerinoides trilobus; Globoquadrina binaiensis; Globoquadrina dehiscens; Globoquadrina larmeui; Globoquadrina praedehiscens; Globoquadrina sellii; Globoquadrina sp.; Globoquadrina tripartita; Globoquadrina venezuelana; Globorotalia archeomenardii; Globorotalia crassaformis; Globorotalia flexuosa; Globorotalia hirsuta; Globorotalia inflata; Globorotalia limbata; Globorotalia menardii; Globorotalia merotumida; Globorotalia multicamerata; Globorotalia pertenuis; Globorotalia plesiotumida; Globorotalia praemenardii; Globorotalia praescitula; Globorotalia scitula; Globorotalia tosaensis; Globorotalia truncatulinoides; Globorotalia tumida; Globorotalia ungulata; Globorotaloides hexagonus; Globorotaloides suteri; Globoturborotalita nepenthes; Globoturborotalita rubescens; Globoturborotalita tenella; Globoturborotalita woodi; Joides Resolution; Leg144; Nannofossil zone; Neogloboquadrina acostaensis; Neogloboquadrina dutertrei; Neogloboquadrina humerosa; North Pacific Ocean; Ocean Drilling Program; ODP; Orbulina suturalis; Orbulina universa; Paragloborotalia continuosa; Paragloborotalia kugleri; Paragloborotalia mayeri; Paragloborotalia nana; Paragloborotalia opima; Paragloborotalia pseudokugleri; Praeorbulina circularis; Praeorbulina curva; Praeorbulina glomerosa; Praeorbulina sicana; Protentella sp.; Pseudohastigerina micra; Pulleniatina finalis; Pulleniatina obliquiloculata; Pulleniatina praecursor; Pulleniatina praespectabilis; Pulleniatina primalis; Pulleniatina spectabilis; Reworked; Sample code/label; Sphaeroidinella dehiscens; Sphaeroidinella excavata; Sphaeroidinellopsis disjuncta; Sphaeroidinellopsis kochi; Sphaeroidinellopsis paenedehiscens; Sphaeroidinellopsis seminulina; Streptochilus spp.; Subbotina gortanii; Subbotina praeturritilina; Tenuitella clemenciae; Tenuitella gemma; Tenuitella iota; Tenuitella sp.; Tenuitellinata angustiumbilicata; Turborotalita humilis
    Type: Dataset
    Format: text/tab-separated-values, 13440 data points
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