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  • 1975-1979  (5)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 2 (1978), S. 0 
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A series of rock reference samples have been analyzed for Ag, Cd and Pb. All elements were determined from a single digest using a method involving solvent extraction and flameless atomic absorption spectrophotometry.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mineralogy and petrology 26 (1979), S. 87-93 
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Amphibolite mittleren Metamorphose-Grades (niedrige Drucke, hohe Temperaturen) von Acebuches, Südwest-Spanien, repräsentieren eine weithin isochemisch metamorphosierte Abfolge von Basalten, die teils differenzierte und teils Cumulus-Gesteine waren. Chemismus und Element-Variationen entsprechen den Tholeiiten von Ozeanböden. Diese Amphibolite können den Frühstadien intensiver Grabenbildung im Zuge der Entstehung des Varistischen Gürtels zugeordnet werden.
    Notes: Summary Mid-grade low P/high T Paleozoic amphibolites from Acebuches (S. W. Spain) represent a mostly isochemically metamorphosed basaltic suite which is partly cumulative and partly differentiated. They have chemical compositions and element variations similar to ocean-floor tholeiites. The amphibolites may be related to the early stages of rapid rifting during the formation of the Variscan belt.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mineralogy and petrology 24 (1977), S. 161-168 
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung In 28 ultramafischen Gesteinen von Tethys-Ophiolithen aus dem nördlichen Appenin (Italien), den Helleniden (Griechenland) und den Dinariden (Jugoslawien) wurde K, U und Li bestimmt. Die analysierten Gesteine zeigen unterschiedliche Serpentinisierung, die zu einem Anstieg des Gehaltes an diesen Elementen führt. Das Verhalten des U während der Umwandlung der ultramafischen Gesteine unterscheidet sich von dem des K und Li. Der ursprüngliche Durchschnittsgehalt an K, Li und U in den ultramafischen Gesteinen war ungefähr 15 ppm, 0,91 ppm und 〈10 ppb.
    Notes: Summary K, U and Li have been determined in 28 ultramafic rocks of the Tethyan ophiolites from the Northern Apennines (Italy), the Hellenides (Greece) and the Dinarides (Yugoslavia). The analyzed rocks show a variable degree of serpentinization, which leads to an increase in the content of these elements. The behaviour of U during alteration of the ultramafic rocks differs from that of K and Li. The average original content of K, Li and U in the ultramafic rocks was about 15 ppm, 0.91 ppm, and 〈10 ppb.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 66 (1978), S. 157-164 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Late Proterozoic calc-alkaline andesitic rocks of the Tassendjanet volcanic complex, north-western Hoggar, Algeria resemble the continental margin rocks and also are closely comparable to the Archaean andesites. Most Tassendjanet rocks were affected to various extents by low grade hydrous metamorphism which led to an increase of Na, P, Fe, Ti, and V and a decrease of Mg, Ca, Sr, Cr, and Ni. Although K, Rb, Ba, and Li are enriched in the majority of altered rocks, these elements are strongly depleted in the albitized Na-rich volcanics. REE are enriched in albitized andesites but their fractionation patterns remain unchanged. The trace element data are consistent with the derivation of the Tassendjanet andesites by partial melting of an upper mantle source enriched in LILE and presumably overlying the subduction zone.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 68 (1978), S. 89-98 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Cenozoic calc-alkaline ignimbrites and related lavas from N.W. Sardinia (Italy), which are closely associated with andesites, have dacitic to rhyolitic composition. The ignimbritic rocks underwent fractional crystallization dominated by plagioclase. The model calculations for REE, Ba, Sr, and Rb are consistent with the generation of ignimbritic magmas by partial melting of tonalitic rocks. P-T estimates for the crystallization of ignimbrites, which give temperatures in the range of 910 °–1070 ° C and P $$P - T - X_{CO_2 }$$ about 5 kb, imply a local increase of temperature in the crust, which is probably related to the ascending andesitic magma. The variations of trace elements indicate that associated andesitic rocks were contaminated by ignimbritic magma.
    Type of Medium: Electronic Resource
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