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  • 1975-1979  (5)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    K, U and Li abundances in ultramafic rocks of the Tethyan ophiolites (1977)
    Springer
    Mineralogy and petrology 24 (1977), S. 161-168 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01158193
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Petrology and geochemistry of the ignimbrites and associated lava domes from N.W. Sardinia (1978)
    Springer
    Contributions to mineralogy and petrology 68 (1978), S. 89-98 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00375450
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Catazonal xenoliths in French Neogene volcanic rocks: Constitution of the lower crust (1977)
    Springer
    Contributions to mineralogy and petrology 62 (1977), S. 283-300 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract 87 samples of granulitic xenoliths scavenged by the Neogene volcanoes in French Massif Central, have been analysed for major elements and Li, Rb, Sr, Ba, V, Cr, Co, Ni, Cu and Zn. These data confirm the presence of rocks with both sedimentary and igneous derivation chemically similar to other granulitic rocks, especially those of the Frazer Range in Australia. Relatively high K and Rb concentration of the metasedimentary rocks conflicts with the hypothesis of systematic depletion of lithophile elements in the lower continental crust. The composition and the elemental variations of the igneous derived rocks suggest a parent magma and a differentiation trend characteristic of tholeiitic rocks. It is proposed that this differentiation was produced at low pressure and consequently, the elemental variation existed before the high pressure granulite facies metamorphism of this series. Although an andesite average of the lower crust (between 25–26 and 12–16 km), directly beneath the Bournac pipe (Velay) is calculated, confirming earlier suggestions of a relatively basic composition but it does not mean that this crust was derived from andesitic rocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371016
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  • 4
    Electronic Resource
    Electronic Resource
    Geochemistry of Late Proterozoic volcanic rocks from Tassendjanet area (N.W. Hoggar, Algeria) (1978)
    Springer
    Contributions to mineralogy and petrology 66 (1978), S. 157-164 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00372154
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  • 5
    Electronic Resource
    Electronic Resource
    Trace element geochemistry of paleozoic amphibolites from S. W. Spain (1979)
    Springer
    Mineralogy and petrology 26 (1979), S. 87-93 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01081294
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    Paper (German National Licenses)
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