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  • 1
    Online Resource
    Online Resource
    A 12 Million Year Record of Caribbean Outflow to the Northwest Atlantic Based on Radiogenic Nd Isotopes Obtained from ODP Site 1006 (2013)
    Saint Petersburg
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (66 Blatt = 2,2 MB) , Illustrationen
    URL: https://oceanrep.geomar.de/23152/
    Language: English
    Note: Zusammenfassung in englischer und russischer Sprache
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  • 2
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    A 12 Million Year Record of Caribbean Outflow to the Northwest Atlantic Based on Radiogenic Nd Isotopes Obtained from ODP Site 1006 (2013)
    In:  (Master thesis), Saint Petersburg State University ; University of Hamburg, Saint Petersburg, Russia ; Hamburg, 66 pp
    Details
    Publication Date: 2015-03-04
    Description: The closure of the Central American Seaway (CAS) has been an interesting research problem for several decades. The exact timing of Panama seaway closure is still unknown, though many methods have been used to try and solve this scientific problem. One such method uses the neodymium isotopic composition (Nd IC) of authigenic Fe-Mn oxihydroxides, which has been successfully applied as a paleoceanographic tool for water mass tracing due to the residence time of Nd in the oceans being shorter than the ocean overturning time and due to independence of Nd IC from biological fractionation and physical processes. The aim of our project was to reconstruct the paleocirculation in the Florida Straits for the last 12 Myrs, and to consider the results in connection with either the Panama closure or the Northern Hemisphere Glaciation. For this purpose we carried out isotopic measurements of Nd, Sr and Pb on the sediment core from ODP Site 1006 (water depth 658 m). The methods applied included the leaching of sediments to obtain the authigenic water signal from Fe-Mn oxyhydroxides and total dissolution to obtain the detrital fraction composition. Measurements were made at GEOMAR Helmholtz Centre for Ocean Research, Kiel, using an Inductive-Coupled Plasma Mass Spectrometer (ICP-MS). Pb IC results were obtained only for the detrital material since the concentrations of Pb in the leachate samples were too low for the isotopic measurements. Isotopic compositions in several core-top sediments were also measured, which could tell us if our signal was a true seawater one. The εNd curves obtained for authigenic and detrital material almost replicate each other. However we observed a strong correlation of our Nd IC record for leachates with other records for Sites close to our. This is why we suggest that we can trust our age model and consider our seawater signal as not having been contaminated by the detrital fraction. According to the Nd IC curve, most likely the Panama seaway was closed by 9.5 Ma for intermediate water exchange, but the final closure timing is hard to evaluate. It has also been shown that an intensive boundary exchange with the material from the continents plays an important role in deriving isotopic signals (since the Site is so shallow and close to the ocean margin). Core top Nd IC was different depending on whether carbonate was removed prior to leaching or not. Therefore as possible future work we would suggest to constrain measurements of Nd IC using fossil fish teeth, as they should reflect a true bottom water signal. Direct seawater measurements in this location would also be very helpful.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 3
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    Miocene restriction of the Pacific-North Atlantic throughflow strengthened Atlantic overturning circulation (2019)
    Nature Research
    In:  Nature Communications, 10 (Article number: 4025 ).
    Details
    Publication Date: 2022-01-31
    Description: Export of warm and salty waters from the Caribbean to the North Atlantic is an essential component of the Atlantic Meridional Overturning Circulation (AMOC). However, there was also an active AMOC during the Miocene, despite evidence for an open Central American Seaway (CAS) that would have allowed low-salinity Pacific waters to enter the Caribbean. To address this apparent contradiction and to constrain the timing of CAS closure we present the first continuous Nd isotope record of intermediate waters in the Florida Strait over the past 12.5 million years. Our results indicate that there was no direct intermediate water mass export from the Caribbean to the Florida Strait between 11.5 and 9.5 Ma, at the same time as a strengthened AMOC. After 9 Ma a strong AMOC was maintained due to a major step in CAS closure and the consequent cessation of low-salinity Pacific waters entering the Caribbean.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
    Format: text
    DOI: 10.1038/s41467-019-12034-7
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    (Table 2a) Neodymium isotopic results for ODP Site 166-1006A (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Keywords: 166-1006A; Age model; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Foraminifera, planktic ε-Neodymium, standard deviation; Joides Resolution; Leg166; Neodymium-143/Neodymium-144 ratio; Sample ID; South Atlantic Ocean; ε-Neodymium, standard deviation; ε-Neodymium (0); ε-Neodymium (T)
    Type: Dataset
    Format: text/tab-separated-values, 292 data points
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  • 5
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    (Table 3a) Strontium isotopic results for ODP Site 166-1006A (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Keywords: 166-1006A; Age model; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Joides Resolution; Leg166; Sample ID; South Atlantic Ocean; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 130 data points
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    DATA PANGAEA
  • 6
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    (Table 2b) Neodymium isotopic results for ODP Site 165-1000 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Keywords: 165-1000A; Age model; Caribbean Sea; Depth, composite; DRILL; Drilling/drill rig; Foraminifera, planktic ε-Neodymium, standard deviation; Joides Resolution; Leg165; Neodymium-143/Neodymium-144 ratio; Sample ID; ε-Neodymium, standard deviation; ε-Neodymium (0); ε-Neodymium (T)
    Type: Dataset
    Format: text/tab-separated-values, 151 data points
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    DATA PANGAEA
  • 7
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    (Table 3b) Strontium isotopic results for ODP Site 165-1000 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Keywords: 165-1000A; Age model; Caribbean Sea; Depth, composite; DRILL; Drilling/drill rig; Joides Resolution; Leg165; Sample ID; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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    DATA PANGAEA
  • 8
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    (Table 1) Neodymium isotopic results for core top samples in the vicinity of ODP Site 1006 (2019)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Keywords: Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; Florida Strait; Foraminifera, planktic ε-Neodymium, standard deviation; GC; Gravity corer; KN166-2; Knorr; KNR166-2; KNR166-2-101; KNR166-2-102; KNR166-2-103; KNR166-2-83; KNR166-2-99; Latitude of event; Layer description; Longitude of event; Method/Device of event; MUC; MultiCorer; Neodymium-143/Neodymium-144 ratio; ε-Neodymium (0)
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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  • 9
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    Neodymium and Strontium isotope compositions from ODP sites 166-1006 and 165-1000 (2019)
    PANGAEA
    In:  Supplement to: Kirillova, Valeriia; Osborne, Anne H; Störling, Tjördis; Frank, Martin (2019): Miocene restriction of the Pacific-North Atlantic throughflow strengthened Atlantic overturning circulation. Nature Communications, 10(1), https://doi.org/10.1038/s41467-019-12034-7
    Details
    Publication Date: 2024-04-25
    Description: Nd isotope composition of weakly cleaned foraminifera in core tops close to ODP Site 1006. 12 Myr record of Nd isotopes measured in weakly cleaned foraminifera from ODP Site 1006. Record from 5.5 to 13.5 Myr of Nd isotopes measured in weakly cleaned foraminifera from ODP Site 1000. 12 Myr record of Nd and Sr isotopes measured in the detrital fraction from ODP Site 1006. Record from 5.5 to 13.5 Myr of Nd and Sr isotopes measured in the detrital fraction from ODP Site 1000.
    Keywords: core top; detrital; Foraminifera; Miocene; Paleoceanography; Pleistocene; Pliocene
    Type: Dataset
    Format: application/zip, 5 datasets
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    DATA PANGAEA
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