GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • PANGAEA  (72)
Document type
Keywords
  • 1
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Katz, Miriam E; Katz, David R; Wright, James D; Miller, Kenneth G; Pak, Dorothy K; Shackleton, Nicholas J; Thomas, Ellen (2003): Early Cenozoic benthic foraminiferal isotopes: Species reliability and interspecies correction factors. Paleoceanography, 18(2), 1024, https://doi.org/10.1029/2002PA000798
    Publication Date: 2024-07-19
    Description: Oxygen and carbon isotope records are important tools used to reconstruct past ocean and climate conditions, with those of benthic foraminifera providing information on the deep oceans. Reconstructions are complicated by interspecies isotopic offsets that result from microhabitat preferences (carbonate precipitation in isotopically distinct environments) and vital effects (species-specific metabolic variation in isotopic fractionation). We provide correction factors for early Cenozoic benthic foraminifera commonly used for isotopic measurements (Cibicidoides spp., Nuttallides truempyi, Oridorsalis spp., Stensioina beccariiformis, Hanzawaia ammophila, and Bulimina spp.), showing that most yield reliable isotopic proxies of environmental change. The statistical methods and larger data sets used in this study provide more robust correction factors than do previous studies. Interspecies isotopic offsets appear to have changed through the Cenozoic, either (1) as a result of evolutionary changes or (2) as an artifact of different statistical methods and data set sizes used to determine the offsets in different studies. Regardless of the reason, the assumption that isotopic offsets have remained constant through the Cenozoic has introduced an 1-2°C uncertainty into deep sea paleotemperature calculations. In addition, we compare multiple species isotopic data from a western North Atlantic section that includes the Paleocene-Eocene thermal maximum to determine the most reliable isotopic indicator for this event. We propose that Oridorsalis spp. was the most reliable deepwater isotopic recorder at this location because it was best able to withstand the harsh water conditions that existed at this time; it may be the best recorder at other locations and for other extreme events also.
    Keywords: 114-698; 114-699; 114-700; 114-702; 145-883; 145-884; 171-1051A; 171-1051B; 171-1052A; 171-1052B; 171-1052C; 171-1052F; Blake Nose, North Atlantic Ocean; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg114; Leg145; Leg171B; North Pacific Ocean; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: dataset publication series
    Format: application/zip, 12 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Katz, Miriam E; Cramer, Benjamin S; Toggweiler, J Robbie; Esmay, Gar; Liu, Chengji; Miller, Kenneth G; Rosenthal, Yair; Wade, Bridget S; Wright, James D (2011): Impact of Antarctic Circumpolar Current development on late Paleogene ocean structure. Science, 332(6033), 1076-7079, https://doi.org/10.1126/science.1202122
    Publication Date: 2024-07-19
    Description: Global cooling and the development of continental-scale Antarctic glaciation occurred in the late middle Eocene to early Oligocene (~38 to 28 million years ago), accompanied by deep-ocean reorganization attributed to gradual Antarctic Circumpolar Current (ACC) development. Our benthic foraminiferal stable isotope comparisons show that a large d13C offset developed between mid-depth (~600 meters) and deep (〉1000 meters) western North Atlantic waters in the early Oligocene, indicating the development of intermediate-depth d13C and O2 minima closely linked in the modern ocean to northward incursion of Antarctic Intermediate Water. At the same time, the ocean's coldest waters became restricted to south of the ACC, probably forming a bottom-ocean layer, as in the modern ocean. We show that the modern four-layer ocean structure (surface, intermediate, deep, and bottom waters) developed during the early Oligocene as a consequence of the ACC.
    Keywords: 171-1053; 171-1053A; ASP-5; Carolina Slope, North Atlantic Ocean; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg171B; North Atlantic; Ocean Drilling Program; ODP
    Type: dataset publication series
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Miller, Kenneth G; Browning, James V; Aubry, Marie-Pierre; Wade, Bridget S; Katz, Miriam E; Kulpecz, Andrew A; Wright, James D (2008): Eocene-Oligocene global climate and sea-level changes: St. Stephens Quarry, Alabama. Geological Society of America Bulletin, 120(1/2), 34-53, https://doi.org/10.1130/B26105.1
    Publication Date: 2024-07-19
    Description: We integrate upper Eocene-lower Oligocene lithostratigraphic, magnetostratigraphic, biostratigraphic, stable isotopic, benthic foraminiferal faunal, downhole log, and sequence stratigraphic studies from the Alabama St. Stephens Quarry (SSQ) core hole, linking global ice volume, sea level, and temperature changes through the greenhouse to icehouse transition of the Cenozoic. We show that the SSQ succession is dissected by hiatuses associated with sequence boundaries. Three previously reported sequence boundaries are well dated here: North Twistwood Creek-Cocoa (35.4-35.9 Ma), Mint Spring-Red Bluff (33.0 Ma), and Bucatunna-Chickasawhay (the mid-Oligocene fall, ca. 30.2 Ma). In addition, we document three previously undetected or controversial sequences: mid-Pachuta (33.9-35.0 Ma), Shubuta-Bumpnose (lowermost Oligocene, ca. 33.6 Ma), and Byram-Glendon (30.5-31.7 Ma). An ~0.9 per mil d18O increase in the SSQ core hole is correlated to the global earliest Oligocene (Oi1) event using magnetobiostratigraphy; this increase is associated with the Shubuta-Bumpnose contact, an erosional surface, and a biofacies shift in the core hole, providing a first-order correlation between ice growth and a sequence boundary that indicates a sea-level fall. The d18O increase is associated with a eustatic fall of ~55 m, indicating that ~0.4 per mil of the increase at Oi1 time was due to temperature. Maximum d18O values of Oi1 occur above the sequence boundary, requiring that deposition resumed during the lowest eustatic lowstand. A precursor d18O increase of 0.5 per mil (33.8 Ma, midchron C13r) at SSQ correlates with a 0.5 per mil increase in the deep Pacific Ocean; the lack of evidence for a sea-level change with the precursor suggests that this was primarily a cooling event, not an ice-volume event. Eocene-Oligocene shelf water temperatures of ~17-19 °C at SSQ are similar to modern values for 100 m water depth in this region. Our study establishes the relationships among ice volume, d18O, and sequences: a latest Eocene cooling event was followed by an earliest Oligocene ice volume and cooling event that lowered sea level and formed a sequence boundary during the early stages of eustatic fall.
    Keywords: Alabama, Alabama, U.S.A., North America; DRILL; Drilling/drill rig; SSQ; St-Stephens-Quarry
    Type: dataset publication series
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 2024-07-19
    Description: Sedimentary records from the equatorial Pacific show that the deepening of the carbonate compensation depth (depth below which the calcium carbonate flux to the seafloor is balanced by dissolution) at the Eocene/Oligocene boundary (~33.9 Ma) was preceded by several episodes of high and low carbonate accumulation rates. However, data from other basins are scarce. Here, we report middle-late Eocene carbonate accumulation rates from sites located in the Pacific, Atlantic, Indian, and Southern Oceans. Our results show that the calcium carbonate burial was geographically, bathymetrically, and temporally heterogenous suggesting the fundamental role of surface calcium carbonate production in driving middle-late Eocene carbonate accumulation rates. Our data also suggest that an increase in ocean ventilation might have influenced calcium carbonate preservation at depths 〉 2500 m.
    Keywords: Carbonate accumulation rates; Eocene; Integrated Ocean Drilling Program; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; ocean drilling program; Ocean Drilling Program; ODP; Site 1053; Site 1090; Site 1218; Site 1263; Site 689; Site 699; Site 709; Site 711; Site 748; Site 884; Site 929; Site U1404; Site U1406
    Type: dataset publication series
    Format: application/zip, 13 datasets
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 2024-07-19
    Keywords: 145-883; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; COMPCORE; Composite Core; DEPTH, sediment/rock; Isotope ratio mass spectrometry; Joides Resolution; Leg145; North Pacific Ocean; Nuttallides truempyi, δ13C; Nuttallides truempyi, δ18O; Ocean Drilling Program; ODP
    Type: dataset
    Format: text/tab-separated-values, 28 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 2024-07-19
    Keywords: 145-884; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; COMPCORE; Composite Core; DEPTH, sediment/rock; Isotope ratio mass spectrometry; Joides Resolution; Leg145; North Pacific Ocean; Nuttallides truempyi, δ13C; Nuttallides truempyi, δ18O; Ocean Drilling Program; ODP
    Type: dataset
    Format: text/tab-separated-values, 8 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Publication Date: 2024-07-19
    Keywords: 171-1051A; Blake Nose, North Atlantic Ocean; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Isotope ratio mass spectrometry; Joides Resolution; Leg171B; Nuttallides truempyi, δ13C; Nuttallides truempyi, δ18O; Ocean Drilling Program; ODP; Oridorsalis spp., δ13C; Oridorsalis spp., δ18O
    Type: dataset
    Format: text/tab-separated-values, 16 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Publication Date: 2024-07-19
    Keywords: 171-1052A; Blake Nose, North Atlantic Ocean; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Hanzawaia ammophila, δ13C; Hanzawaia ammophila, δ18O; Isotope ratio mass spectrometry; Joides Resolution; Leg171B; Ocean Drilling Program; ODP
    Type: dataset
    Format: text/tab-separated-values, 4 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    Publication Date: 2024-07-19
    Keywords: 171-1052B; Blake Nose, North Atlantic Ocean; Bulimina spp., δ13C; Bulimina spp., δ18O; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Hanzawaia ammophila, δ13C; Hanzawaia ammophila, δ18O; Isotope ratio mass spectrometry; Joides Resolution; Leg171B; Ocean Drilling Program; ODP
    Type: dataset
    Format: text/tab-separated-values, 338 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    Publication Date: 2024-07-19
    Keywords: 171-1051B; Blake Nose, North Atlantic Ocean; Cibicidoides spp., δ13C; Cibicidoides spp., δ18O; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Isotope ratio mass spectrometry; Joides Resolution; Leg171B; Nuttallides truempyi, δ13C; Nuttallides truempyi, δ18O; Ocean Drilling Program; ODP; Oridorsalis spp., δ13C; Oridorsalis spp., δ18O; Stensioeina beccariiformis, δ13C; Stensioeina beccariiformis, δ18O
    Type: dataset
    Format: text/tab-separated-values, 172 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...