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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of earth sciences 88 (2000), S. 803-813 
    ISSN: 1437-3262
    Keywords: Key words Pyriclasite ; Granulite ; Amphibolite ; Shear zone ; Metamorphism Dehydration ; Hoher-Bogen ; Teplá-Barrandian ; Moldanubian ; Bohemian massif
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Ductile extensional movements along the steeply inclined Hoher-Bogen shear zone caused the juxtaposition of Teplá-Barrandian amphibolites, granulites, and metaperidotites against Moldanubian mica schists and paragneisses. Garnet pyriclasites are well preserved within low-strain domains of this shear zone. Their degree of metamorphism is significantly higher than that of the surrounding rocks. Microstructural and mineral chemical data suggest in situ formation of the garnet pyriclasite by dehydration of pyroxene amphibolite at T〉750–840°C and P〈10–13 kbar including recrystallization-accommodated grain-size reduction of plagioclase and clinopyroxene, nucleation of garnet, and breakdown of amphibole into garnet+clinopyroxene+rutile. Subsequent decompression and retrograde extensional shearing led to the formation of mylonitic epidote amphibolite. The presence of lower crustal and mantle-derived slices within the Hoher-Bogen shear zone supports the view that (a) in Upper Devonian times the Teplá-Barrandian unit was thrust over Moldanubian rocks as a complete crustal unit, and (b) that during the subsequent Lower Carboniferous orogenic collapse, the garnet pyriclasite and metaperidotite were scraped off from the basal parts of the Teplá-Barrandian unit being dragged into the Hoher-Bogen shear zone due to dramatic and large-scale elevator-style movements.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Wood science and technology 23 (1989), S. 280-280 
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1436-736X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: A decrease of tracheid lengths as well as of the lumina of early wood has been ascertained in sapwood annual rings smaller than 0.5 mm in width of mature spruce, the wood of which having been subject to heavy damage due to pollution. The late wood was characterized by decreasing cell wall thickness and larger microfibril angles within the cell wall layer The anatomical and structural features of wood distinguished by narrow annual rings have been found both in heavily pollution-damaged trees as well as in trees with comparably narrow annual rings of non-polluted sites. Strength investigations in terms of materials testing according to DIN yielded normal strength values of wood that was not affected by secondary agents. Investigations on particularly small test specimens (Dynstat examinations) up to a minimal annual ring width confirm the known relationships between wood density and impact bending strength. Thus, the wood of spruces growing in the high-altitude belts of the eastern parts of Erz Gebirge may be used without reservations.
    Notes: Im Holz von durch -Immissionen stark geschädigten Altfichten wurden in weniger als 0,5 mm breiten Splintholzjahrringen eine Verringerung der Tracheidenlangen und abnehmende Frühholzzellumina gefunden. Das Spätholz war durch abnehmende Zellwandstärken und flachere Mikrofibrillenwinkel in der Zellwandschicht charakterisiert. Die anatomischen und strukturellen Merkmale des Holzes schmaler Jahrringe wurden sowohl in stark immissions- geschädigten Bäumen als auch in Bäumen mit vergleichbar schmalen Jahrringen auf unbelasteten Standorten gefunden. Festigkeitsuntersuchungen in Form von Werkstoffprüfungen nach DIN zeigten normale Festigkeitswerte in sekundär unbeeinflußtem Holz. Untersuchungen an besonders kleinen Prüfkörpern (Dynstatprüfungen) bestätigen bis zu einer minimalen Jahrringbreite von 0,4 mm die bekannten Beziehungen zwischen Rohdichte und Schlagbiegefestigkeit. Somit kann das Holz von Fichten aus den Hochlagen des Osterzgebirges uneingeschränkt verwendet werden.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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