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  • 1
    Electronic Resource
    Electronic Resource
    Rare earth and trace element characteristics of ophiolitic metabasalts from the Alpine-Apennine belt
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 53 (1981), S. 109-123 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(81)90032-7
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  • 2
    Electronic Resource
    Electronic Resource
    Clinopyroxene composition of ophiolitic metabasalts in the Mediterranean area
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 43 (1979), S. 61-73 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(79)90155-9
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  • 3
    Electronic Resource
    Electronic Resource
    The trace element geochemistry of Corsican ophiolites (1977)
    Springer
    Contributions to mineralogy and petrology 64 (1977), S. 11-31 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Ultramafic rocks, gabbros, plagiogranites, dolerites and basaltic dikes and pillows lavas of the ophiolite slices of eastern Corsica have been metamorphosed in both oceanic and orogenic environments. The trace element content of the metabasaltic rocks which exhibit a tholeiitic differentiation trend towards a ferrobasaltic composition, is similar to that of oceanic basalts. The cumulate sequence is interpreted to have been formed by fractional crystallization from an olivine-tholeiite magma. The troctolites representing cumulates derived from melts representing liquid fractions in the range F=1-0.85, gabbros from melts with F=0.85-0.45, and ferrogabbros and plagiogranites from melts with F〈0.45. An oceanic environment with moderate spreading rates and magmatic processes similar to present-day normal oceanic ridge segments is considered the more probable original setting of the Corsican ophiolites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00375283
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  • 4
    Electronic Resource
    Electronic Resource
    Petrogenesis of calc-alkaline, shoshonitic and associated ultrapotassic Oligocene volcanic rocks from the Northwestern Alps, Italy (1984)
    Springer
    Contributions to mineralogy and petrology 86 (1984), S. 209-220 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Along the Western Alps there is geological evidence of late-Alpine (Oligocene) magmatic activity which clearly postdates the Lepontine (Eocene-early Oligocene) metamorphism and related deformation of the Alpine nappe pile. This magmatic activity was notably delayed in relation to the most important convergent processes and may be related to buoyancy of lithosphere, tensional tectonics and thermal updoming subsequent to the collision between the Eurasian and African plates. The geochemical features of the rocks and the geophysical characteristics of the Alpine chain, suggest that: (a) shoshonitic and calcalkaline melts may have been generated by partial melting of metasomatized peridotitic material and subsequent fractional crystallization and crustal contamination; silicic andesites and latites, however, could have been also derived from metasomatized eclogite or deep continental crust material; (b) the ultrapotassic lamprophyres with high K, P, LREE, Th, Zr, U and high 87Sr/86Sr ratios were generated by partial melting of strongly metasomatized mantle; the varied Sr-isotopic ratios may partially also reflect additional radiogenic component from the continental crust following magma segregation from the source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373666
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  • 5
    Electronic Resource
    Electronic Resource
    The geochemistry and petrogenesis of an ophiolitic sequence from Pindos, Greece (1980)
    Springer
    Contributions to mineralogy and petrology 74 (1980), S. 189-200 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The ophiolites of Northern Pindos have been studied in a section close to the village of Perivoli (Grevena District). The section comprises cumulus rocks ranging from ultramafics to gabbros, overlain by dolerites (non-cumulus microgabbro) capped by thick frequently pillowed lava flows. The sequence is cut by basaltic dykes. While the cumulus rocks and the dolerites are mostly fresh, the lavas and dykes are strongly transformed. Major and trace element (Ni, Cr, Sc, Y, Zr, Nb, Sr, Ba, Zn, Cu, V, Li) data are presented for selected samples from the sequence. For some elements, the volcanic/subvolcanic rocks (flows, dykes, dolerites) exhibit wide chemical characteristics which are considered to mainly reflect variations within the parent magmas. Some lavas appear to be closely comparable with the present-day ocean-floor basalts, while other flows and most of the dykes are strongly depleted in some “incompatible” elements and are similar to some rocks from immature island arcs. The dolerites have transitional chemical features. The Pindos lavas differ from Western Mediterranean ophiolites in that the former have lower Ti,P,Zr,Y, higher Fe tot. and normally higher Ti/Zr ratio. The volcanic/subvolcanic rocks from Pindos have been derived from separate magmas. Some lavas were possibly produced by variable partial melting of an already depleted mantle source, while the lavas exhibiting ocean-floor affinity were probably generated by partial melting of a less depleted source. The wide chemical variations of the Pindos lavas cannot be easily explained by an ocean-ridge system. An “island arc-marginal basin system” could better account for the observed chemical features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132004
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  • 6
    Electronic Resource
    Electronic Resource
    Geochemistry and petrogenesis of ophiolites from Northern Pindos (Greece) (1984)
    Springer
    Bulletin of volcanology 47 (1984), S. 39-46 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The ophiolitic complex of Northern Pindos (Greece) contains ocean-floor basalts and low-Ti mafic rocks. The former rocks are similar to recent mid-ocean ridge basalts with a light REE depletion and a La/Yb ratio 〈 2. The low-Ti rocks resemble boninites in their high Mg and very low Ti and Zr contents and in their REE patterns which have convex-downwards shape with a slight light REE enrichment. However, their Zr/Ti, Ti/V and Zr/Y ratios are lower than in boninites. Both rock-types could be generated by dynamic partial melting of a rising upper mantle diapir. Slight enrichment in light REE, Sr, Rb and Ba in low-Ti rocks could be the result of either metasomatic or alteration processes. Although a subduction zone origin of the sequence is possible, the geochemical data do not necessarily imply such a setting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960539
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  • 7
    Electronic Resource
    Electronic Resource
    Uranium in clinopyroxenes of ophiolitic metabasalts from the Mediterranean area (1988)
    Springer
    Mineralogy and petrology 38 (1988), S. 285-289 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Die Urangehalte von Klinopyroxenen ophiolitischer Metabasalte aus mediterranen Ophioliten wurden mit der Fission-track-Methode bestimmt. Die Werte liegen zwischen 4.3 und 25.6 ppb und zeigen eine deutliche Korrelation mit Zr, Y, P2O5 sowie mit den Ce/Yb-Verhältnissen der Muttergesteine. Die Zusammensetzung der Magmen dürfte der dominierende Faktor für die Uranverteilung sein.
    Notes: Summary The uranium content in clinopyroxenes of ophiolitic metabasalts from the Mediterranean ophiolites, determined by fission-track mapping, varies between 4.3 and 25.6 ppb. It is strongly correlated with Zr, Y, P2O5 and the Ce/Yb ratio of the host rocks, suggesting that it depends mainly on the chemistry of the parent magmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01167094
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  • 8
    Electronic Resource
    Electronic Resource
    Geochemistry and petrogenesis of two-Pyroxene andesites from Sierra de Gata (SE Spain) (1990)
    Springer
    Mineralogy and petrology 41 (1990), S. 199-213 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Die miozäne Vulkanitabfolge der Sierra de Gata (Betische Kordillere) wird von Daciten, Rhyodaciten, Rhyoliten sowie basaltischen Andesiten and Andesiten aufgebaut, letztere sind in einem guten Erhaltungszustand and zeigen die geringste Fraktionierung. Sie wurden daher genauer untersucht, um Aussagen über die Genese dieser Vulkanite machen zu können. Phenokrysten und Grundmasse bestehen aus Plagioklas, Orthopyroxen, Klinopyroxen und Magnetit. Manchmal kommen Olivin und Ilmenit hinzu. Die Geochemie der Andesite folgt typisch “orogenen” Trends. Sie sind durch sehr niedrige Ni-, Co- und Cr-Gehalte und negative Eu-Anomalien charakterisiert; dies belegt eine Fraktionierung der mafischen Gemengteile und des Plagioklases in der Tiefe. Die petrogenetische Entwicklung der Andesite kann allerdings nicht einfach mit Fraktionierungsprozessen eines einzigen mafischen Magmas erklärt werden. Das Fehlen von Element-Korrelationen, das starke Streuen der Sr-Isotopenverhältnisse und das Isotopenungleichgewicht zwischen den einzelnen Mineralphasen stehen in Widerspruch zu einem derartigen einfachen Modell. Ein Modell, das die Petrogenese der untersuchten Andesite besser erklärt, zieht die Beteiligung verschiedener mafischen Schmelzen-sie bildeten sich in einem heterogenen Mantel und sind durch Unterschiede im Chemismus und ihrer Isotopenzusammensetzung charakterisiert—in Betracht. Dabei kam es zu Fraktionierung dieser Magmen in der Tiefe und zu beträchtlichen Reaktionen mit kontinentalem Krustenmaterial.
    Notes: Summary The Miocene volcanic suite of Sierra de Gata (Betic Cordillera) is composed of dacites, rhyodacites and rhyolites, besides basaltic andesites and andesites. The latter are very fresh and are the least fractionated rock types; thus they have been investigated in order to put some constraints on the genetic interpretation of the volcanic sequence. These rocks are composed of plagioclase, orthopyroxene, clinopyroxene and magnetite both as phenocrysts and in the groundmass. Olivine and ilmenite occur occasionally. The andesites exhibit “orogenic” chemical features. They are characterized by very low Ni, Co and Cr contents and show negative Eu anomalies, which support fractionation of mafic phases and plagioclase at depth. The petrogenesis of the andesites, however, cannot be related simply to fractionation processes of a single mafic magma since the lack of good interelemental correlations, the scattering of Sr-isotope ratios and the isotope disequilibrium between the phases conflict with such a simple mechanism. A model which can better explain the petrogenesis of the analyzed andesites considers the intervention of different mafic melts, generated in a heterogeneous mantle and characterized by different chemical and isotopic compositions, which fractionated at depth and concomitantly interacted significantly with the continental crust.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168495
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  • 9
    Electronic Resource
    Electronic Resource
    Clinopyroxenes and amphiboles in a metadolerite from the northern apennines. Implications on the palaeogeographic role of ophiolites (1979)
    Springer
    Mineralogy and petrology 26 (1979), S. 21-37 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Ein Metadolerit aus den Ophiolithen des Nördlichen Apennins (Vignola im Panaro-Tal bei Modena, Italien) entspricht in den Gehalten an Ti, P, Zr, Cr, Y und Nb den Tholeiiten der Ozeanböden. Er weicht hingegen von typischen ozeanischen Tholeiiten dadurch ab, daß er 1. primäre Alkaliamphibole enthält, daß 2. seine Klinopyroxene im Diagramm TiO2−MnO−Na2O nicht in die Felder der Tholeiite der Ozeanböden fallen und daß 3, der berechnete U-Gehalt für die mit seinen magmatischen Mineralen im Gleichgewicht stehenden liquiden Phase ähnlich jener ist, die für Alkalibasalte angegeben wird. Diese Ergebnisse schränken die generelle Bedeutung, die den Ophiolithen des Nördlichen Apennins bisher allgemein zugeschrieben wurde, ein: Nicht alle entstanden an sich ausdehnenden Rücken ähnlich jenen der heutigen Ozeanböden. Die metamorphen Parageneses zeigen, daß das Gestein bei niedrigem Druck, wahrscheinlich in ozeanischer Umgebung, Umwandlungen erlitt; dann folgten Rekristallisationen unter höherem Druck, die wohl zeitlich mit einer Orogenese zusammenfielen.
    Notes: Summary A metadolerite of the ophiolites of the Northern Apennines (Vignola, Panaro Valley, near Modena, Italy) behaves as ocean-floor tholeiites when Ti, P, Zr, Cr, Y and Nb are considered. However, it deviates from typical oceanic tholeiites in that(1) it contains primary alkali amphiboles, (2) its clinopyroxenes plot in the diagram TiO2−MnO−Na2O not in the fields of the ocean-floor basalts, and (3) the calculated uranium content of the liquid in equilibrium with its magmatic minerals is similar to the one reported for alkali basalts. These results put constraints on the generalized significance attributed to the ophiolites of the Northern Apennines, i. e. not all of them were generated at spreading ridges similar to the “normal ridge segments” of the present-day ocean-floors, as has been generally accepted by now. The metamorphic parageneses indicate that the rock underwent low-pressure transformations, probably in oceanic environment, followed by recrystallizations at higher pressure, reasonably in concomitance with an orogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081288
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  • 10
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    Low- and high-Ti ophiolites in Northern Pindos: Petrological and geological constraints (1981)
    Springer
    Details
    Publication Date: 1981-09-01
    Print ISSN: 0258-8900
    Electronic ISSN: 1432-0819
    Topics: Geosciences
    Published by Springer
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