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  • 1
    Online Resource
    Online Resource
    Preservation of geochemical proxies in foraminifera during carbonate diagenesis in sediments of the eastern equatorial Pacific : = Erhaltung geochemischer Proxies in Foraminiferen während der Karbonatdiagenese in Sedimentkernen des östlichen äquatorialen Pazifiks (2015)
    Kiel : Universitätsbibliothek Kiel
    Details Availability
    Keywords: Hochschulschrift ; Pazifischer Ozean Ost ; Foraminiferen ; Carbonatisierung ; Diagenese
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (202, X Seiten) , Illustrationen
    URL: http://nbn-resolving.org/urn:nbn:de:gbv:8-diss-172992
    URL: http://d-nb.info/1169652735/34
    URL: https://macau.uni-kiel.de/receive/dissertation_diss_00017299
    URN: urn:nbn:de:gbv:8-diss-172992
    DDC: 550
    Language: English
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  • 2
    Online Resource
    Online Resource
    Determination of the critical aragonite saturation state under which skeleton structures of the cold-water coral Lophelia pertusa begin to dissolve (2010)
    Rostock
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (92 Seiten = 18 MB) , Illustrationen, Graphen, Karten
    Edition: 2021
    URL: https://oceanrep.geomar.de/10545/
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 3
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    Miocene stable isotope record of benthic foraminifera from IODP Site 320-U1336 (2015)
    PANGAEA
    In:  Supplement to: Voigt, Janett; Hathorne, Ed C; Frank, Martin; Holbourn, Ann E (2016): Minimal influence of recrystallization on middle Miocene benthic foraminiferal stable isotope stratigraphy in the eastern equatorial Pacific. Paleoceanography, 31(1), 98-114, https://doi.org/10.1002/2015PA002822
    Details
    Publication Date: 2023-12-14
    Description: Stable carbon and oxygen isotopes (d13C and d18O) of foraminiferal tests are amongst the most important tools in paleoceanography but the extent to which recrystallization can alter the isotopic composition of the tests is not well known. Here, we compare three middle Miocene (16–13 Ma) benthic foraminiferal stable isotope records from eastern equatorial Pacific sites with different diagenetic histories to investigate the effect of recrystallization. To test an extreme case, we analyzed stable isotope compositions of benthic foraminifera from Integrated Ocean Drilling Program Site U1336, for which the geochemistry of bulk carbonates and associated pore waters indicate continued diagenetic alteration in sediments 〉 14.7 Ma. Despite this diagenetic overprinting, the amplitudes and absolute values of the analyzed U1336 stable isotopes agree well with high resolution records from better preserved Sites U1337 and U1338 nearby. Our results suggest that although benthic foraminiferal tests of all three sites show some degree of textural changes due to recrystallization, they have retained their original stable isotope signatures. The good agreement of the benthic foraminiferal stable isotope records demonstrates that recrystallization occurred extremely rapidly (〈100 kyr) after deposition. This is confirmed by the preservation of orbital cyclicities in U1336 stable isotope data and d18O values being different to inorganic calcite that would precipitate from U1336 pore waters during late recrystallization. The close similarity of the benthic foraminiferal stable isotope records between the sites allows the well resolved paleo-magnetic results of Site U1336 to be transferred to Sites U1337 and U1338 improving the global Geological Timescale.
    Keywords: 320-U1336; AGE; COMPCORE; Composite Core; Depth, composite revised; DEPTH, sediment/rock; Exp320; Foraminifera, benthic δ13C; Foraminifera, benthic δ18O; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Pacific Equatorial Age Transect I; Sample code/label; Species
    Type: Dataset
    Format: text/tab-separated-values, 1835 data points
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    DATA PANGAEA
  • 4
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    Variability of carbonate diagenesis in equatorial Pacific sediments deduced from radiogenic and stable Sr isotopes (2015)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 148 . pp. 360-377.
    Details
    Publication Date: 2019-09-23
    Description: The recrystallisation (dissolution–precipitation) of carbonate sediments has been successfully modelled to explain profiles of pore water Sr concentration and radiogenic Sr isotope composition at different locations of the global ocean. However, there have been few systematic studies trying to better understand the relative importance of factors influencing the variability of carbonate recrystallisation. Here we present results from a multi-component study of recrystallisation in sediments from the Integrated Ocean Drilling Program (IODP) Expedition 320/321 Pacific Equatorial Age Transect (PEAT), where sediments of similar initial composition have been subjected to different diagenetic histories. The PEAT sites investigated exhibit variable pore water Sr concentrations gradients with the largest gradients in the youngest sites. Radiogenic Sr isotopes suggest recrystallisation was relative rapid, consistent with modelling of other sediment columns, as the 87Sr/86Sr ratios are indistinguishable (within 2σ uncertainties) from contemporaneous seawater 87Sr/86Sr ratios. Bulk carbonate leachates and associated pore waters of Site U1336 have lower 87Sr/86Sr ratios than contemporaneous seawater in sediments older than 20.2 Ma most likely resulting from the upward diffusion of Sr from older recrystallised carbonates. It seems that recrystallisation at Site U1336 may still be on-going at depths below 102.5 rmcd (revised metres composite depth) suggesting a late phase of recrystallisation. Furthermore, the lower Sr/Ca ratios of bulk carbonates of Site U1336 compared to the other PEAT sites suggest more extensive diagenetic alteration as less Sr is incorporated into secondary calcite. Compared to the other PEAT sites, U1336 has an inferred greater thermal gradient and a higher carbonate content. The enhanced thermal gradient seems to have made these sediments more reactive and enhanced recrystallisation. In this study we investigate stable Sr isotopes from carbonate-rich deep sea sediments for the first time. Pore water δ88/86Sr increases with depth (from 0.428‰ to values reaching up to 0.700‰) at Site U1336 documenting an isotope fractionation process during recrystallisation. Secondary calcite preferentially incorporates the lighter Sr isotope (86Sr) leaving pore waters isotopically heavy. The δ88/86Sr values of the carbonates themselves show more uniform values with no detectable change with depth. Carbonates have a much higher Sr content and total Sr inventory than the pore waters meaning pore waters are much more sensitive to fractionation processes than the carbonates. The δ88/86Sr results indicate that pore water stable Sr isotopes have the potential to indicate the recrystallisation of carbonate sediments.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.gca.2014.10.001
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Minimal influence of recrystallization on middle Miocene benthic foraminiferal stable isotope stratigraphy in the eastern equatorial Pacific (2016)
    AGU (American Geophysical Union) | Wiley
    In:  Paleoceanography, 31 (1). pp. 98-114.
    Details
    Publication Date: 2019-09-23
    Description: Stable carbon and oxygen isotopes (δ13C and δ18O) of foraminiferal tests are amongst the most important tools in paleoceanography, but the extent to which recrystallization can alter the isotopic composition of the tests is not well known. Here we compare three middle Miocene (16–13 Ma) benthic foraminiferal stable isotope records from eastern equatorial Pacific sites with different diagenetic histories to investigate the effect of recrystallization. To test an extreme case, we analyzed stable isotope compositions of benthic foraminifera from Integrated Ocean Drilling Program Site U1336, for which the geochemistry of bulk carbonates and associated pore waters indicates continued diagenetic alteration in sediments 〉 14.7 Ma. Despite this diagenetic overprinting, the amplitudes and absolute values of the analyzed U1336 stable isotopes agree well with high-resolution records from better preserved Sites U1337 and U1338 nearby. Our results suggest that although benthic foraminiferal tests of all three sites show some degree of textural changes due to recrystallization, they have retained their original stable isotope signatures. The good agreement of the benthic foraminiferal stable isotope records demonstrates that recrystallization occurred extremely rapidly (〈 100 kyr) after deposition. This is confirmed by the preservation of orbital cyclicities in U1336 stable isotope data and δ18O values being different to inorganic calcite that would precipitate from U1336 pore waters during late recrystallization. The close similarity of the benthic foraminiferal stable isotope records between the sites allows the well-resolved paleomagnetic results of Site U1336 to be transferred to Sites U1337 and U1338 improving the global geological timescale.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2015PA002822
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Carbonate diagenesis in the sediments from the Pacific Equatorial Age Transect (PEAT) (2013)
    In:  [Talk] In: Gemeinsames IODP/ICDP Kolloquium 2013, 27.03.2013, Freiberg .
    Details
    Publication Date: 2016-04-26
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 7
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    Carbonate diagenesis in the Pacific Equatorial Age Transect (PEAT) Sites and the preservation of geochemical signals in foraminifera (2012)
    In:  [Poster] In: Gemeinsames IODP/ICDP Kolloquium 2012, 07.03.-09.03.2012, Kiel .
    Details
    Publication Date: 2012-04-12
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 8
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    Reliable geochemical proxy data from recrystallised foraminifera (2013)
    In:  [Poster] In: 11. International Conference on Paleoceanography (ICP11) 2013, 01.-06.09.2013, Sitges - Barcelona, Spain .
    Details
    Publication Date: 2016-04-26
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 9
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    Preservation and reliability of geochemical proxy data from foraminifera (2013)
    In:  [Talk] In: TMS Conference 2013 – Micropalaeontology and the IODP: Past, Present and Future Applications, 19.11.2013, London, UK .
    Details
    Publication Date: 2016-04-26
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 10
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    Carbonate diagenesis in the Pacific Equatorial Age Transect (PEAT) sites and the preservation of geochemical signals in foraminifera (2012)
    In:  [Talk] In: 22. V. M. Goldtschmidt Conference 2012, Earth in Evolution, 28.06.2012, Montréal, Québec, Canada .
    Details
    Publication Date: 2016-04-26
    Description: The calcite shells (tests) of foraminifera used for reconstructions of oceanic and climatic conditions in the past can be altered after deposition by a process where the original biogenic calcite is replaced by secondary (inorganic) calcite. It is important to quantify changes in the elemental and isotopic composition of the tests caused by this recrystallisation process and thus the reliability of the proxy data. We present initial results from a multi-component study of recrystallisation in sediments from the IODP Expedition 320/321 Pacific Equatorial Age Transect (PEAT), where sediments of similar age and initial composition have been subjected to different diagenetic histories. 87Sr/86Sr ratios of bulk carbonate leachates and the associated pore waters generally suggest that recrystallisation occurred relatively rapidly as the values are indistinguishable (within 2σ uncertainties) from contemporaneous seawater [1]. Notable exceptions include Site U1336, where pore waters and the bulk carbonates in sediments older than 20.3 Ma have lower 87Sr/86Sr ratios than contemporaneous seawater, most likely resulting from the upward diffusion of Sr from older recrystallised carbonates. Furthermore, the lower Sr/Ca ratios of bulk carbonates from Site U1336, compared to the other PEAT sites, suggest more extensive diagenetic alteration as less Sr is incorporated into secondary calcite. Although the recrystallisation of bulk carbonates is well documented, the fate of foraminiferal chemistry is potentially different. To investigate this, laser ablation ICP-MS element/Ca ratio depth profiles through tests of the planktonic foraminifera G. venezuelana from Sites U1336 and U1338 were obtained for two time intervals (13.9 Ma and 15.5 Ma). The depth profiling technique reveals heterogeneity of Mg/Ca and Mn/Ca ratios through the wall of the tests comparable to those reported for modern foraminifera from sediment traps [2]. The Sr/Ca ratios show little heterogeneity and fluctuate around 1.1-1.2 mmol/mol as also observed for modern tests. The Sr/Ca ratios exhibit no systematic difference between the sites and time intervals. Therefore, the intra-test element/Ca heterogeneity suggests that foraminifera react differently to bulk carbonates (nanno-fossils) during diagenetic recrystallisation and much of the original geochemical proxy signal may have been retained. [1] McArthur et al. (2001) The Journal of Geology 109, 155-170 [2] Hathorne et al. (2009) Paleoceanography 24, PA4204
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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    OceanRep: Talk
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