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  • 1
    Electronic Resource
    Electronic Resource
    Geological constraints on tidal dissipation and dynamical ellipticity of the Earth over the past three million years (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 409 (2001), S. 1029-1033 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The evolution of the Solar System has been shown to be chaotic, which limits our ability to retrace the orbital and precessional motion of the Earth over more than 35–50 Myr (ref. 2). Moreover, the precession, obliquity and insolation parameters can also be influenced by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35059062
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A Geochemical Record of Precession-Induced Cyclic Eastern Mediterranean Sedimentation: Implications for Northern Sahara Humidity During the Pliocene (1999)
    Springer
    Naturwissenschaften 86 (1999), S. 281-286 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Description / Table of Contents: Abstract. The chemical composition of lithogenic components in Pliocene sediments from the eastern Mediterranean displays periodic variations that are related to earth's orbital parameters owing to changes in insolation of the northern hemisphere. This can be explained by two different paleoclimatic/palaeoceanographic scenarios. During oligotrophic periods, similar to those persisting in the modern Mediterranean, sedimentation is rather uniform, and sediments receive high proportions of eolian material from the surrounding deserts. During more humid intervals sedimentation is dominated by fluviatile material that has been introduced by the Nile and northern borderland rivers. Higher nutrient loads associated with enhanced riverine input and a change in water circulation led to eutrophication, water column anoxia, and sapropel deposition in the eastern Mediterranean. Our investigations confirm earlier works claiming that in large parts of the northern Sahara palaeoclimatic conditions changed frequently from arid to more humid. Our results suggest that these changes in the Pliocene match with the approximately 22-ka insolation cyclicity.
    Notes: Zusammenfassung Der Chemismus lithogener Komponenten pliozäner Sedimente des östlichen Mittelmeers weist periodische Änderungen auf, die mit den Orbitalparametern der Erde und dadurch hervorgerufenen Variationen der Sonneneinstrahlung im Bereich der Nordhemisphäre einhergehen. Dadurch entstehen zwei gegensätzliche paläoklimatische bzw. paläozeanographische Szenarien. In Zeiten mit geringen Niederschlägen und oligotrophen Bedingungen im Mittelmeer, wie sie auch heute vorherrschen, ist die Sedimentation sehr stark von äolischen Staubeinträgen angrenzender Wüstengebiete gekennzeichnet. Demgegenüber dominiert in feuchten Klimaperioden die Sedimentation von fluviatilem Material, das durch den Nil und Flüsse der nördlich an das Mittelmeer grenzenden Gebiete eingetragen wird. Die durch Zirkulationsänderungen sowie den Nährstoffeintrag der Flüsse induzierten eutrophen Bedingungen führten schließlich zur Ausbildung von Wassersäulen-Anoxia und der Ablagerung von Sapropelen im östlichen Mittelmeer. Unsere Untersuchungen unterstützen frühere Forschungsergebnisse, wonach in weiten Teilen der nördlichen Sahara ein häufigerer Wechsel zwischen ariden und humideren Klimabedingungen stattfand. Nach unseren Ergebnissen folgte dieser rhythmische Wechsel im Pliozän dem Insolationszyklus von ca. 22 ka.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050615
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  • 3
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    The sapropel record of the eastern Mediterranean Sea (2000)
    PANGAEA
    In:  Supplement to: Emeis, Kay-Christian; Sakamoto, Tatsuhiko; Wehausen, Rolf; Brumsack, Hans-Jürgen (2000): The sapropel record of the eastern Mediterranean Sea - results of Ocean Drilling Program Leg 160. Palaeogeography, Palaeoclimatology, Palaeoecology, 158(3-4), 371-395, https://doi.org/10.1016/S0031-0182(00)00059-6
    Details
    Publication Date: 2024-01-09
    Description: Research on sediments recovered during Ocean Drilling Leg 160 has concentrated on two issues: the first concerned the stratigraphy of sapropel formation, the second was oriented to clarify specific processes that explain sapropel origin. Progress has been made in the construction of stratigraphic composites out of sedimentary sequences from individual holes at each of the palaeoceanographic sites. On the composites, initial work has resulted in the establishment of high-resolution and intermediate-resolution stratigraphies for three sites (963, 964, 967); correlation of sedimentary cycles to astronomical (insolation) cycles extends the stratigraphies to Sites 969 and 966. The sapropel occurrences in the marine and land sequences over the entire Eastern Mediterranean are correlated; with the resolution that can be obtained from isotope studies, groups of sapropels occurred simultaneously over the entire basin. In detail, however, the temporal and facies patterns of sapropel sequences differ between individual sites and depositional basins. The differences may be related to effects of water depth, diagenesis, and post-depositional tectonic attenuation of sequences. Studies on the geochemistry and facies of sapropels agree that anoxic conditions favoured preservation of organic matter in sapropels, caused the enrichment of trace metals associated with sapropels, and helped to preserve primary sedimentary structures. Besides, all evidence is consistent with elevated fluxes of organic matter and associated elements during sapropel events.
    Keywords: 160-964; 160-966; 160-967; 160-969; COMPCORE; Composite Core; Eastern Basin; Joides Resolution; Leg160; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 4
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    (Table T1) Geochemical composition of ODP Site 184-1143 late Pliocene sediments (2003)
    PANGAEA
    In:  Supplement to: Wehausen, Rolf; Tian, Jun; Brumsack, Hans-Jürgen; Cheng, Xinrong; Wang, Pinxian (2003): Geochemistry of Pliocene sediments from ODP Site 1143 (southern South China Sea). In: Prell, WL; Wang, P; Blum, P; Rea, DK; Clemens, SC (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 184, 1-25, https://doi.org/10.2973/odp.proc.sr.184.201.2003
    Details
    Publication Date: 2024-01-09
    Description: Pliocene core intervals from Ocean Drilling Program Site 1143 located in the southern part of the South China Sea were measured for their major and minor element composition at ~2-k.y. resolution. Changes in sediment composition parallel glacial-interglacial changes as indicated by the corresponding oxygen isotope record of benthic foraminifers. Carbonate contents are lower during glacial stages and higher during interglacial stages. This is attributed to dilution by a higher contribution of terrigenous detrital matter during glacial intervals and to enhanced biological productivity during interglacials as indicated by enrichments in barium. The terrigenous detrital matter fraction shows small but distinct changes in composition. These variations may be explained by multiple processes, including changes in provenance and weathering caused by monsoonal climate variability and sea level fluctuations. Gradual or long-term changes in sediment composition also occur during the investigated interval. There is a shift toward lower TiO2 (carbonate-free basis; cfb) values at around 2.9 Ma and an increase in Al2O3 (cfb) variations at around 2.55 Ma. These changes can be explained in both cases by an increasing contribution from the Mekong River, delivering material with low TiO2 (cfb)/Al2O3 (cfb) ratios, followed by a gradual increase in weathering, causing higher Al2O3 (cfb) (probably reflecting kaolinite) contents. Both may be the result of an enhanced summer monsoon. The manganese and phosphate geochemistry of Site 1143 sediments seem to be strongly dominated by biological productivity and a high burial flux of carbonate, which acts as an adsorbing agent and/or substrate. During strong interglacials and corresponding times of enhanced productivity, Mn may be remobilized from continental margin sediments deposited within an oxygen minimum zone and subsequently exported into the pelagic region, where it oxidizes and settles to form Mn-enriched layers in the sediment.
    Keywords: 184-1143; Aluminium oxide; Arsenic; Barium; Calcium oxide; Carbon, inorganic, total; Carbon, organic, total; Chromium; Cobalt; COMPCORE; Composite Core; Coulometric titration; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Iron oxide, Fe2O3; Joides Resolution; Leg184; Manganese oxide; Nickel; Ocean Drilling Program; ODP; Phosphorus pentoxide; Potassium oxide; Rubidium; Sample code/label; Silicon dioxide; South China Sea; Strontium; Titanium dioxide; Vanadium; X-ray fluorescence spectrometer (Philips PW2400); Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 6714 data points
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  • 5
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    Ti/Al ratios of ODP Site 160-967 (2001)
    PANGAEA
    In:  Supplement to: Lourens, Lucas Joost; Wehausen, Rolf; Brumsack, Hans-Jürgen (2001): Geological constraints on tidal dissipation and dynamical ellipticity of the Earth over the past three million years. Nature, 409(6823), 1029-1033, https://doi.org/10.1038/35059062
    Details
    Publication Date: 2024-01-09
    Description: The evolution of the Solar System has been shown to be chaotic (Laskar, 1990, doi:10.1016/0019-1035(90)90084-M), which limits our ability to retrace the orbital and precessional motion of the Earth over more than 35-50 Myr (Laskar, 1999, doi:10.1098/rsta.1999.0399). Moreover, the precession, obliquity and insolation parameters (Laskar et al., 1993; Quinn et al., 1991) can also be influenced by secular variations in the tidal dissipation and dynamical ellipticity of the Earth induced by glacial cyclicity (Laskar et al., 1993; Dehant et al., 1990, doi:10.1029/JD095iD06p07573; Tushingham et al., 1991, doi:10.1029/90JB01583; Peltier and Jiang, 1994, doi:10.1029/94GL02058; Mitrovica and Forte, 1995, doi:10.1111/j.1365-246X.1995.tb03508.x, Mitrovica et al., 1997, doi:10.1111/j.1365-246X.1997.tb01554.x) and mantle convection (Forte and Mitrovica, 1997, doi:10.1038/37769). Here we determine the average values of these dissipative effects over the past three million years. We have computed the optimal fit between an exceptional palaeoclimate record from the eastern Mediterranean Sea and a model of the astronomical and insolation history3 by testing a number of values for the tidal dissipation and dynamical ellipticity parameters. We find that the combined effects of dynamical ellipticity and tidal dissipation were, on average, significantly lower over the past three million years, compared to their present-day values (determined from artificial satellite data and lunar ranging (Laskar et al., 1993; Quinn et al., 1991; Stephenson and Morrison, 1995). This secular variation associated with the Plio-Pleistocene ice load history has caused an average acceleration in the Earth's rotation over the past 3 Myr, which needs to be considered in the construction of astronomical timescales and in research into the stationarity of phase relations in the ocean-climate system through time.
    Keywords: 160-967; COMPCORE; Composite Core; Depth, bottom/max; Depth, composite revised; Depth, composite revised, adjusted; DEPTH, sediment/rock; Depth, top/min; DSDP/ODP/IODP sample designation; Eastern Basin; Intercore correlation; Joides Resolution; Leg160; Ocean Drilling Program; ODP; Sample code/label; Titanium/Aluminium ratio; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 3276 data points
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    DATA PANGAEA
  • 6
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    (Table 2) Occurrence of sapropels and marker layers in ODP Site 160-966 in the eastern Mediterranean Sea (2000)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 160-966; AGE; Comment; COMPCORE; Composite Core; Depth, composite; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Eastern Basin; Joides Resolution; Leg160; Lithologic unit/sequence; Ocean Drilling Program; ODP; Sample code/label; Sample comment; Sediment thickness
    Type: Dataset
    Format: text/tab-separated-values, 610 data points
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    DATA PANGAEA
  • 7
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    (Table 4) Occurrence of sapropels and marker layers in ODP Site 160-969 in the eastern Mediterranean Sea (2000)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 160-969; AGE; Comment; COMPCORE; Composite Core; Depth, composite; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Eastern Basin; Joides Resolution; Leg160; Lithologic unit/sequence; Ocean Drilling Program; ODP; Sample code/label; Sample comment; Sediment thickness
    Type: Dataset
    Format: text/tab-separated-values, 813 data points
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  • 8
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    (Fig. 5) Strontium and Neodymium data of sediment core M40/4_MC540E (2003)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: 87; Balearic Islands, western Mediterranean Sea; Calculated; DEPTH, sediment/rock; GeoTü; M40/4; M40/4_MC540E; Mass spectrometer Finnigan MAT 262; Meteor (1986); MUC; MultiCorer; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Paleoceanography at Tübingen University; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; ε-Neodymium
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 9
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    (Fig. 4) Si/Al ratios and Ti/Al ratios of sediment core M40/4_SL87 (2003)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: DEPTH, sediment/rock; GeoTü; Gravity corer (Kiel type); M40/4; M40/4_87-6SL; M40/4_SL87; Meteor (1986); Paleoceanography at Tübingen University; Silicon/Aluminium ratio; SL; Titanium/Aluminium ratio; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 314 data points
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  • 10
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    (Table 1) Occurrence of sapropels and marker layers in ODP Site 160-964 in the eastern Mediterranean Sea (2000)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 160-964; AGE; Comment; COMPCORE; Composite Core; Depth, composite; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Eastern Basin; Joides Resolution; Leg160; Lithologic unit/sequence; Ocean Drilling Program; ODP; Sample code/label; Sample comment; Sediment thickness
    Type: Dataset
    Format: text/tab-separated-values, 496 data points
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