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  • 1
    Book
    Book
    Regionale und altersabhängige Variation gesteinsmagnetischer Parameter in marinen Sedimenten der Arktis : = Regional and temporal variations of rock magnetic parameters in Arctic marine sediments (1995)
    Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung
    Details Availability
    Keywords: Hochschulschrift ; Forschungsbericht ; Arktis ; Meeressediment ; Gesteinsmagnetismus ; Stratigraphie ; Arktis ; Meeressediment ; Gesteinsmagnetismus ; Stratigraphie
    Type of Medium: Book
    Pages: VII, 212 S. , Ill., graph. Darst., Kt.
    Series Statement: Berichte zur Polarforschung 164
    URL: http://www.gbv.de/dms/goettingen/18578335X.pdf
    URL: http://www.gbv.de/dms/goettingen/18578335X.pdf
    DDC: 538/.78163/2
    RVK:
    RY 20075
    RVK:
    RY 20115
    Language: German
    Note: Literaturverz. S. 163 - 174 , Intermediärsprache: Englisch , Zugl.: Bremen, Univ., Diss., 1994
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  • 2
    Online Resource
    Online Resource
    SO202 - INOPEX : Innovatives Nordpazifik Experiment ; Paläo- und Umweltmagnetik, Kernlogging ; Schlussbericht zum Teilantrag der Universität Bremen ; Berichtszeitraum: 01.04.2009 - 31.05.2012 (2012)
    Bremen : Univ., FB Geowissenschaften
    Details Availability
    Keywords: Forschungsbericht ; Beringmeer ; Pazifischer Ozean Nord ; Biogeochemie ; Paläoozeanographie
    Type of Medium: Online Resource
    Pages: Online-Ressource (28 S., 1,93 MB) , graph. Darst., Kt.
    URL: https://edocs.tib.eu/files/e01fb12/730716813.pdf
    URL: https://doi.org/10.2314/GBV:730716813
    URL: https://edocs.tib.eu/files/e01fb12/730716813l.pdf
    DOI: 10.2314/GBV:730716813
    Language: German , English
    Note: Förderkennzeichen BMBF 03G0202B. - Engl. Berichtsbl. u.d.T.: SO202 - INOPEX: Innovative North Pacific experiment: paleo- and enviromagnetics , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader. , Mit engl. Zsfassung
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  • 3
    Online Resource
    Online Resource
    A late Miocene-early Pliocene Antarctic deepwater record of repeated iron reduction events (2009)
    Associated volumes
    Details Availability
    In: Marine geology, Amsterdam [u.a.] : Elsevier Science, 1964, 266(2009), 1/4, Seite 198-211, 1872-6151
    In: volume:266
    In: year:2009
    In: number:1/4
    In: pages:198-211
    Description / Table of Contents: In this study we present a late Miocene-early Pliocene record of sixty-four zones with prominent losses in the magnetic susceptibility signal, taken on a sediment drift (ODP Site 1095) on the Pacific continental rise of the West Antarctic Peninsula. The zones are comparable in shape and magnitude and occur commonly at glacial-to-interglacial transitions. High resolution records of organic matter, magnetic susceptibility and clay mineral composition from early Pliocene intervals demonstrate that neither dilution effects nor provenance changes of the sediments have caused the magnetic susceptibility losses. Instead, reductive dissolution of magnetite under suboxic conditions seems to be the most likely explanation. We propose that during the deglaciation exceptionally high organic fluxes in combination with weak bottom water currents and prominent sediment draping diatom ooze layers produced temporary suboxic conditions in the uppermost sediments. It is remarkable that synsedimentary suboxic conditions can be observed in one of the best ventilated open ocean regions of the World.
    Type of Medium: Online Resource
    Pages: Ill., graph. Darst
    ISSN: 1872-6151
    DOI: 10.1016/j.margeo.2009.08.006
    Language: English
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetostratigraphic Data From Late Quaternary Sediments From the Yermak Plateau, Arctic Ocean: Evidence For Four Geomagnetic Polarity Events Within the Last 170 Ka of the Brunhes Chron (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 117 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Palaeomagnetic investigations of two sediment cores recovered from RV Polarstern near the eastern slope of the Yermak Plateau (sites PS 1533 and PS 2212) reveal convincing evidence for four polarity events of the Earth's magnetic field during the last 170 Ka. A comprehensive rock magnetic study of the sediments proved that fine-grained magnetite is the principal carrier of the remanent magnetization. No changes in magneto-mineralogy across the polarity transitions in the sediments investigated were found. Calcareous nannofossil biostratigraphy, AMS-14C (accelerated mass spectrometry) and oxygen isotope data, and 10Be and 230Th stratigraphies yielded age ranges of 24–29 Ka for the Mono Lake event, 34–43 Ka for the Laschamp event, 72–86 Ka for the Norwegian-Greenland Sea event and 118–128 Ka for the Blake event. Two reverse polarity samples at the base of core PS 2212–3 KAL are interpreted as the termination of the Biwa I event (171-181 Ka). the events exhibit full inversion of inclination in both cores. the data suggest that the transition process of the Earth's magnetic field during such polarity events requires some 1 Ka.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03944.x
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    Paper (German National Licenses)
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  • 5
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    Sedimentation rates in the Makarov Basin, central Arctic Ocean: A paleomagnetic and rock magnetic approach (2001)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 16 (4). pp. 368-389.
    Details
    Publication Date: 2019-09-23
    Description: Three long sediment cores from the Makarov Basin have been subjected to detailed paleomagnetic and rock magnetic analyses. Investigated sediments are dominated by normal polarity including short reversal excursions, indicating that most of the sediments are of Brunhes age. In general, the recovered sediments show only low to moderate variability in concentration and grain size of the remanence-carrying minerals. Estimations of relative paleointensity variations yielded a well-documented succession of pronounced lows and highs that could be correlated to published reference curves. However, together with five accelerator mass spectrometry C-14 ages and an incomplete Be-10 record, still two different interpretations of the paleomagnetic data are possible, with long-term sedimentation rates of either 1.3 or 4 cm kyr(-1) However, both models implicate highly variable sedimentation rates of up to 10 cm kyr(-1), and abrupt changes in rock magnetic parameters might even indicate several hiatuses.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2000PA000521
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Arctic Ocean evidence for late Quaternary initiation of northern Eurasian ice sheets (1997)
    GSA, Geological Society of America
    In:  Geology, 25 (9). pp. 783-786.
    Details
    Publication Date: 2017-04-10
    Description: A high-resolution multiparameter stratigraphy allows the identification of late Quaternary glacial and interglacial cycles in a central Arctic Ocean sediment core. Distinct sandy layers in the upper part of the otherwise fine-grained sediment core from the Lomonosov Ridge (lat 87.5°N) correlate to four major glacials since ca. 0.7 Ma. The composition of these ice-rafted terrigenous sediments points to a glaciated northern Siberia as the main source. In contrast, lithic carbonates derived from North America are also present in older sediments and indicate a northern North American glaciation since at least 2.8 Ma. We conclude that large-scale northern Siberian glaciation began much later than other Northern Hemisphere ice sheets.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1130/0091-7613(1997)​025〈0783:AOEFLQ〉​2.3.CO;2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    An astronomically dated record of Earth’s climate and its predictability over the last 66 Million Years (2020)
    AAAS (American Association for the Advancement of Science)
    Details
    Publication Date: 2023-02-08
    Description: Much of our understanding of Earth’s past climate comes from the measurement of oxygen and carbon isotope variations in deep-sea benthic foraminifera. Yet, long intervals in existing records lack the temporal resolution and age control needed to thoroughly categorize climate states of the Cenozoic era and to study their dynamics. Here, we present a new, highly resolved, astronomically dated, continuous composite of benthic foraminifer isotope records developed in our laboratories. Four climate states—Hothouse, Warmhouse, Coolhouse, Icehouse—are identified on the basis of their distinctive response to astronomical forcing depending on greenhouse gas concentrations and polar ice sheet volume. Statistical analysis of the nonlinear behavior encoded in our record reveals the key role that polar ice volume plays in the predictability of Cenozoic climate dynamics.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Dating North Pacific Abyssal Sediments by Geomagnetic Paleointensity: Implications of Magnetization Carriers, Plio-Pleistocene Climate Change, and Benthic Redox Conditions (2021)
    Frontiers
    Details
    Publication Date: 2024-02-07
    Description: Non-carbonaceous abyssal fine-grained sediments cover vast parts of the North Pacific’s deep oceanic basins and gain increasing interests as glacial carbon traps. They are, however, difficult to date at an orbital-scale temporal resolution and still rarely used for paleoceanographic reconstructions. Here, we show that sedimentary records of past geomagnetic field intensity have high potential to improve reversal-based magnetostratigraphic age models. Five sediment cores from Central North Pacific mid-latitudes (39–47°N) and abyssal water depths ranging from 3,900 to 6,100 m were cube-sampled at 23 mm resolution and analyzed by automated standard paleo- and rock magnetic methods, XRF scanning, and electron microscopy. Relative Paleointensity (RPI) records were determined by comparing natural vs. anhysteretic remanent magnetization losses during alternating field demagnetization using a slope method within optimized coercivity windows. The paleomagnetic record delivered well interpretable geomagnetic reversal sequences back to 3 Ma. This age span covers the climate-induced transition from a biogenic magnetite prevalence in the Late Pliocene and Early Pleistocene to a dust-dominated detrital magnetic mineral assemblage since the Mid-Pleistocene. Volcaniclastic materials from concurrent eruptions and gravitational or contouritic sediment re-deposition along extinct seamount flanks provide a further important source of fine- to coarse-grained magnetic carriers. Surprisingly, higher proportions of biogenic vs. detrital magnetite in the late Pliocene correlate with systematically lowered RPI values, which seems to be a consequence of magnetofossil oxidation rather than reductive depletion. Our abyssal RPI records match the astronomically tuned stack of the mostly bathyal Pacific RPI records. While a stratigraphic correlation of rock magnetic and element ratio logs with standard oxygen isotope records was sporadically possible, the RPI minima allowed to establish further stratigraphic tie points at ∼50 kyr intervals. Thus, this RPI-enhanced magnetostratigraphy appears to be a major step forward to reliably date unaltered abyssal North Pacific sediments close to orbital-scale resolution.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: image
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  • 9
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    First evidence for a late LGM subglacial lake in Pine Island Bay, Antarctica (2016)
    Geophysical Research Abstracts, Vol. 18, EGU2016-7429
    In:  EPIC3EGU General Assembly, Vienna, 2016-04-18-2016-04-22Geophysical Research Abstracts, Vol. 18, EGU2016-7429
    Details
    Publication Date: 2018-08-10
    Description: Subglacial lakes are widespread beneath the Antarctic Ice Sheet and as a source for subglacial meltwater they are assumed to modulate ice stream velocity. Further, the evacuation of subglacial meltwater at the ice sheet margin influences ocean circulation and geochemical cycles. However, despite their importance„ subglacial lakes are one of the least explored environments on our planet. As a consequence, their importance for ice sheet dynamics and their ability to harbour life remain poorly characterised. We present the first direct evidence for a palaeo-subglacial lake on the Antarctic continental shelf, document- ing that subglacial meltwater was stored during the last glacial period and evacuated during the subsequent deglaciation. A distinct sediment facies observed in a core recovered from a small bedrock basin in Pine Island Bay, Amundsen Sea, is indicative of deposition within a low-energy subglacial lake setting. Diffusive modelling demonstrates that low chloride concentrations in the pore water of this characteristic sediment facies can only be explained by original deposition in a freshwater setting. We also show that the location of the subglacial lake within a basin on the inner shelf is consistent with the predicted distribution of subglacial lakes based on bathymetric data. This finding will enable future modelling studies to investigate how the geometry and capacity of subglacial lake systems can influence ice dynamics when the substrate and profile of the ice sheet is known – especially in the highly sensitive area known as the "weak underbelly" of the WAIS. With the exception of a direct lake water access at Subglacial Lake Vostok, and some centimetres of sediment retrieval from Subglacial Lake Whillans, the subglacial hydrological system in Antarctica has hitherto mostly been explored using remote sensing and numerical models that suggest the number of potential lake sites to more than 12.000. Our study not only provides first empirical evidence for a palaeo-subglacial lake but also delivers a framework for investigating and refining exploration of these unique subglacial lake environments and their sediments beneath thick contemporary ice sheets. Our approach, however, is easier and cheaper to conduct by using ship borne coring equipment on the seasonal ice-free continental shelf.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 10
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    Erstmalige erfolgreiche Beprobung subglazialer See-Sedimente vom inneren Kontinentalschelf der Antarktis. (2016)
    Deutsche Gesellschaft für Polarforschung
    In:  EPIC340. Treffen des Arbeitskreises "Geologie und Geophysik der Polargebiete", DLR Berlin-Adlershof, 2016-05-26-2016-05-27Deutsche Gesellschaft für Polarforschung
    Details
    Publication Date: 2018-08-10
    Description: Subglaziale Seen sind unter dem Antarktischen Eisschild weit verbreitet. Sie bilden eine Quelle von subglazialem Schmelzwasser und modulieren weitgehend die Fließgeschwindigkeiten des überlagernden Eisstromes. Der Ausbruch von subglazialem Schmelzwasser am Rande des Eisschildes kann die globale ozeanographische Zirkulation, den Meeresspiegelanstieg und geochemische Zyklen beeinflussen. Trotz ihrer Bedeutung sind subglaziale Seen eine der am wenigsten erforschten Umgebungen auf unserem Planeten. Ihre Auswirkungen auf die Dynamik der Eisbedeckung und ihr Potential primitives aber autarkes Leben zu beherbergen, sind weitgehend schlecht charakterisiert. Wir präsentieren den ersten direkten Beweis für einen paläo-subglazialen See auf dem antarktischen Kontinentalschelf. Sedimentablagerungen beweisen, dass subglaziales Schmelzwasser während oder kurz nach der letzten Eiszeit unter dem Antarktischen Eisschild vorhanden war und erst bei der Enteisung entleert wurde. Im Pine Island Bay (Amundsen Sea Embayment, ASE) haben wir zum ersten Mal in der Antarktis mehr als drei Meter dieser typischen Sedimentfazies, die auf wenig dynamische Ablagerungsbedingungen in einem subglazialen See schließen lassen, beprobt. Niedrige Chloridkonzentrationen im Porenwasser des Sedimentkernes und diffus-advektive Modellierung der zeitlichen Entwicklung dieser Chloridkonzentrationen im Porenwasser zeigen eindeutig die Genese der Sedimente in einem subglazialen, schmelzwassergefüllten See. Basierend auf bathymetrischen Daten können wir zeigen, dass die Lage des subglazialen Sees mit einer prognostizierten Verteilung von subglazialen Seen in diesem Gebiet übereinstimmt. Dieser Befund ermöglicht Modellierungsstudien der Eisdynamik bei bekannter Geometrie des Eisuntergrundes, des Volumens der subglazialen Seen, der Eigenschaften des unterlagernden Substrates und der Form des Eisstroms. Dies ist besonders wichtig für den Pine Island Gletscher, der als "Weak Underbelly" des Westantarktischen Eisschildes (WAIS) gilt. Bisher wurde nur die Eis/Wasser Grenzfläche im subglazialen Wostoksee und wenige Zentimeter diamiktischen Sedimentes vom Whillans-See beprobt. Ansonsten wurde das antarktische subglaziale hydrologische System durch Fernerkundung und numerische Modelle rekonstruiert und die Anzahl der potenziellen subglazialen Seen auf mehr als 12000 geschätzt. Unsere Studie liefert nicht nur den ersten Nachweis für eiszeitliche subglaziale Seen und Beprobung dieser Sedimente in der Antarktis, sondern auch einen Rahmen für weitere Untersuchungen dieser einzigartigen subglazialen See-Umgebung in einer kostengünstigen Variante durch Schiffsexpeditionen auf dem saisonal eisfreien inneren Kontinentalschelf.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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