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  • 1
    Keywords: Kongreß Konferenz ; palaeolimnology ; paleolimnology ; Konferenzschrift 1991 ; Europa ; Maar ; Paläolimnologie
    Type of Medium: Book
    Pages: IX, 513 S , Ill., graph. Darst
    ISBN: 3540565701 , 0387565701
    Series Statement: Lecture notes in earth sciences 49
    DDC: 551.48/2/094
    RVK:
    Language: English
    Note: Literaturan
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Climate dynamics 6 (1992), S. 229-232 
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Annually laminated, non-glacial lake sediments from Lake Holzmaar (Eifel, western Germany) were investigated using large “Merkt” thin sections. The absolute age of varve intervals with variations in thickness and composition were correlated to climatic changes recorded by glacier fluctuations in the Alps. Back to 8800 years VT (varve time = varve years before 1950) glacier advances coincide with sedimentation rate minima; prior to 8800 years VT they coincide with sedimentation rate maxima. The early and middle Holocene sediments suggest a periodicity of about 1000 years for cold/warm cycles. A sequence of 512 varve-thickness measurements was subjected to spectral analysis. These provide apparent evidence for a 11-year sun-spot cycle.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 214 (1991), S. 59-61 
    ISSN: 1573-5117
    Keywords: varves ; absolute dating ; Late Quaternary ; West Germany
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A high precision absolute timescale has been developed from annually laminated lake sediments from lakes in the Eifel area, West Germany. Calibration of relative dating methods (palynology, paleomagnetism) was carried out successfully. In addition palecological and astronomical information was obtained from varve thickness measurements, and the composition of annual layers.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2023-06-09
    Description: In den verlandeten und wasserführenden Maaren der Westeifel läßt sich die jüngste Erdgeschichte Mitteleuropas anhand hoch zeitauflösender Sedimentsequenzen erfassen. Die Arbeiten haben mit der Dokumentation des Hoch-, Spät- und Postglazials in den wasserführenden Maaren begonnen, deren Alter größer als 18-20000 Jahre B. R zu sein scheint, da eine heute 10 bis 12 m unter Wasser liegende Terrasse dem letzten, stark ariden hochglazialen Stadium zugewiesen wird. Für diese Aussage sprechen auch die alten morphologischen Formen. Eine seismische Vorsondierung im Meerfelder Maar hatte komplizierte Lagerungsverhältnisse ergeben, die auch in der 45 m tiefen „Sondierung'7 angetroffen wurden. Die im wesentlichen aus Turbiditen, Sideriten und jahreszeitlich geschichteten Diatomeengyttjen bestehende Gesamtabfolge in allen untersuchten Maarseen der Eifel wird durch zwei markante Tephrahorizonte gegliedert. Es handelt sich um einen hochglazialen „Basaltischen Aschentuff" und um den Laacher Bimstuff. Die Warvenstratigraphie im Meerfelder Maar und Holzmaar ergab für Mitteleuropa den ersten 13 000 Jahreskalender. Die Basis des Holozäns kann danach auf etwa 12 800 vor heute verlegt werden. Die Spektralanalyse an den Sedimentationsraten der organischen Warven im Holzmaar erbrachte die bekannten spektralen Perioden, die verschiedene Ursachen besitzen, so u. a. die Sonnenfleckentätigkeit und andere astronomische Periodizitäten, die das Klima der Erde modifizieren.
    Description: Abstract: The young geological history of central Europe is documented in high resolution sedimentary sequences of Westeifel-maars. Investigations started with studies of Pleistocene and Holocene lake Sediments. According to terraces existing 10-12 m below the today water tables the lakes have an age older than 18000-20000 years. Seismic pre-studies revealed complicated „layerings" which could be proved during drilling. The sedimentary sequence consists of turbidites, siderites and annualy laminated diatomaceous gyttja and is characterized by two tephrachronological marked horizons, an high glacial „Basaltic Tuff" and the Laach Pumice Tuff. Varvechronology of Meerfeld Maar and Holzmaar Sediments allowed the assessment of the first 13 000 year calendar in central Europe. The base of the Holocene, therefore, can be fixed around 12 800 before today. Spectral analysis of the thickness of the organic varves revealed well-known sun spot cycles and astronomical periods modifying our climate on earth.
    Description: research
    Keywords: ddc:554.3 ; Eifel ; Maare
    Language: German
    Type: doc-type:article , publishedVersion
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