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  • Pyrenees  (2)
  • Analytical Chemistry and Spectroscopy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    High-frequency cycles in the upper Aptian carbonates of the Organyà basin, NE spain (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 586-605 
    Details
    ISSN: 1437-3262
    Keywords: Carbonate ramp ; Sequence stratigraphy ; Cyclostratigraphy ; Pyrenees ; Aptian ; Albian
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract High-frequency cycles in Upper Aptian carbonates have been studied on the carbonate ramp of Organyà (southeastern Pyrenees). The depositional area comprises a shallow marine to deeper marine transect. A detailed facies model is developed subdividing the transect into an inner ramp area (above fairweather wave base), a mid-ramp area (between fairweather wave base and storm wave base) and an outer ramp area (below storm wave base). Based on microfacies analysis a cyclostratigraphic and sequence stratigraphic interpretation is established. Variations of the sedimentary patterns within different sections of the homoclinal ramp are due mainly to sea level changes. Sea level changes of third and fourth order are reflected by the shifting of the shallow subtidal facies belts up and down the ramp. The study of fifth-order sea level changes is based on statistical methods (quantitative facies analysis and principal component analysis). The ratio of the fourth- and fifth-order cycles is very similar to the well-known ratio of the eccentricity (100 ka) and the precession (18.6/22.5 ka). The absolute age values derived from the cyclostratigraphy fit into the biostratigraphic framework. Thus, a global eustatic control is assumed to be responsible for the cycles of higher frequency. The lower frequency third-order sequences, however, were considerably influenced by local tectonic processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02369013
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High-frequency cycles in the upper Aptian carbonates of the Organyà basin, NE spain (1996)
    Springer
    Geologische Rundschau 85 (1996), S. 586-605 
    Details
    ISSN: 0016-7835
    Keywords: Key words Carbonate ramp ; Sequence stratigraphy ; Cyclostratigraphy ; Pyrenees ; Aptian ; Albian
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  High-frequency cycles in Upper Aptian carbonates have been studied on the carbonate ramp of Organyà (southeastern Pyrenees). The depositional area comprises a shallow marine to deeper marine transect. A detailed facies model is developed subdividing the transect into an inner ramp area (above fair-weather wave base), a mid-ramp area (between fair-weather wave base and storm wave base) and an outer ramp area (below storm wave base). Based on microfacies analysis a cyclostratigraphic and sequence stratigraphic interpretation is established. Variations of the sedimentary patterns within different sections of the homoclinal ramp are due mainly to sea level changes. Sea level changes of third and fourth order are reflected by the shifting of the shallow subtidal facies belts up and down the ramp. The study of fifth-order sea level changes is based on statistical methods (quantitative facies analysis and principal component analysis). The ratio of the fourth- and fifth-order cycles is very similar to the well-known ratio of the eccentricity (100 ka) and the precession (18.6/22.5 ka). The absolute age values derived from the cyclostratigraphy fit into the biostratigraphic framework. Thus, a global eustatic control is assumed to be responsible for the cycles of higher frequency. The lower frequency third-order sequences, however, were considerably influenced by local tectonic processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050099
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Hochauflösungs-13C-NMR-Spektroskopie. III. Mitteilung s. Lit. 1. - Die Spektren von (2-Dimethylamino-1-propenyl)triazinen (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 199-205 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Using the pulse Fourier transform technique, the undecoupled carbon-13 NMR spectra of the products obtained in the reaction of methyltriazines with 1-(dimethylamino)-1-ethoxyethylene have been recorded and completely assigned. A comparison of the observed 13C chemical shifts and 13C—H coupling constants with those in the starting triazines and in 2-dimethylamino-2-penten-4-one confirms the (2-dimethylamino-1-propenyl) triazine structure. The data are discussed in terms of steric effects and of the configuration and conformation of the sidechain.
    Notes: Die unentkoppelten 13C-NMR-Spektren der bei der Reaktion von Methyltriazinen mit 1-Äthoxy-1-(dimethylamino)-äthylen entstandenen Produkte wurden mit Hilfe der Puls-Fourier-Transform-Technik aufgenommen und analysiert. Der Vergleich der beobachteten 13C-chemischen Verschiebungen und 13C—H-Kopplungskonstanten mit denen der Ausgangstriazine und des 2-Dimethylamino-2-penten-4-ons bestätigt die (2-Dimethylamino-1-propenyl)triazin-Struktur. Die Daten werden im Hinblick auf sterische Effekte sowie die Konfiguration und Konformation der Seitenkette diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070504
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    Paper (German National Licenses)
    Fulltext
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