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  • 1
    Keywords: Granit ; Gesteinskunde ; Geologie ; Geochemie ; Kongress ; Huelva ; Magmatisches Gestein ; Magmatismus ; Magma ; Magmakammer ; Schmelze ; Intrusion ; Erdkruste ; Erdmantel ; Viskosität ; Angewandte Geophysik ; Textur ; Modellierung
    Description / Table of Contents: Understanding granites: integrating new and classical techniques / Antonio Castro, Carlos Fernández and Jean Louis Vigneresse / Geological Society, London, Special Publications, 168, 1-5, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.01 --- Some time-space relationships for crustal melting and granitic intrusion at various depths / Alan Bruce Thompson / Geological Society, London, Special Publications, 168, 7-25, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.02 --- Granitic melt viscosities / Donald B. Dingwell / Geological Society, London, Special Publications, 168, 27-38, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.03 --- Geophysical imaging of the shape of granitic intrusions at depth: a review / L. Améglio and J. L. Vigneresse / Geological Society, London, Special Publications, 168, 39-54, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.04 --- What do experiments tell us about the relative contributions of crust and mantle to the origin of granitic magmas? / Alberto E. Patiño Douce / Geological Society, London, Special Publications, 168, 55-75, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.05 --- Geometry of granite emplacement in the upper crust: contributions of analogue modelling / Teresa Román-Berdiel / Geological Society, London, Special Publications, 168, 77-94, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.06 --- A multidisciplinary approach combining geochemical, gravity and structural data: implications for pluton emplacement and zonation / L. Hecht and J. L. Vigneresse / Geological Society, London, Special Publications, 168, 95-110, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.07 --- The Coastal Batholith and other aspects of Andean magmatism in Peru / E. J. Cobbing / Geological Society, London, Special Publications, 168, 111-122, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.08 --- Contrasts in morphogenesis and tectonic setting during contemporaneous emplacement of S- and I-type granitoids in the Eastern Lachlan Fold Belt, southeastern Australia / R. Trzebski, P. Lennox and D. Palmer / Geological Society, London, Special Publications, 168, 123-140, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.09 --- Structure and geophysics of the Gåsborn granite, central Sweden: an example of fracture-fed asymmetric pluton emplacement / Alexander R. Cruden, Håkan Sjöström and Sven Aaro / Geological Society, London, Special Publications, 168, 141-160, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.10 --- Emplacement of the Joshua Flat-Beer Creek Pluton (White Inyo Mountains, California): a story of multiple material transfer processes / Carlo Dietl / Geological Society, London, Special Publications, 168, 161-176, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.11 --- Petrology, magnetic fabric and emplacement in a strike-slip regime of a zoned peraluminous granite: the Campanario-La Haba pluton, Spain / A. Alonso Olazabal, M. Carracedo and A. Aranguren / Geological Society, London, Special Publications, 168, 177-190, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.12 --- Brittle behaviour of granitic magma: the example of Puente del Congosto, Iberian Massif, Spain / Carlos Fernández and Antonio Castro / Geological Society, London, Special Publications, 168, 191-206, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.13 --- Origin of megacrysts in granitoids by textural coarsening: a crystal size distribution (CSD) study of microcline in the Cathedral Peak Granodiorite, Sierra Nevada, California / Michael D. Higgins / Geological Society, London, Special Publications, 168, 207-219, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.14 --- Movement of melt during synchronous regional deformation and granulite-facies anatexis, an example from the Wuluma Hills, central Australia / E. W. Sawyer, C. Dombrowski and W. J. Collins / Geological Society, London, Special Publications, 168, 221-237, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.15 --- Partial melting and P-T-t evolution of LP/HT metamorphic terranes: an example from the Svecofennian K-feldspar-poor leucosome migmatite belt, Southern Finland / H. Mouri and K. Korsman / Geological Society, London, Special Publications, 168, 239-253, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.16 --- Evidence of magmatic hybridization related with feeding zones: the synkinematic Guitiriz granitoid, NW Iberian Massif / M. Menéndez and L. A. Ortega / Geological Society, London, Special Publications, 168, 255-272, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.17
    Pages: Online-Ressource (272 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1862390584
    Language: English
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  • 2
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Twenty-three Escherichia coli O26 strains from humans, cattle, sheep, pigs and chicken were investigated for virulence markers and for genetic similarity by pulsed field gel electrophoresis and multi locus sequence typing. Two groups of genetically closely related O26 strains were defined. One group is formed by enteropathogenic (EPEC) and enterohemorrhagic (EHEC) E. coli strains, which do not ferment rhamnose and dulcitol and most of these carry a plasmid encoding enterohemolysin. The other group consists of rhamnose and dulcitol fermenting EPEC strains, which carry plasmids encoding α-hemolysin. Multiple species of domestic animals were shown to serve as a reservoir for human pathogenic O26 EPEC and EHEC strains.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of earth sciences 73 (1984), S. 869-880 
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Some plutons of the Central-Extremadura batholith show lateral widening at the final stage of their emplacement. Consequently, various fracture systems have developed, generally filled by aplites that appear both in the plutonic mass and in the metamorphic host rocks. The spatial arrangement of fractures may be interpreted in a simple model in which an important role is played by fluid pressure, as it determines the value of the acting effective stress and, naturally, the different failure mechanisms reflected in different dike systems.
    Abstract: Résumé Quelques plutons du batholite de l'Estremadure centrale ont donné lieu à une expansion latérale au stade final de leur mise en place. Plusieurs systèmes de fractures se sont ainsi développées; elles sont généralement occupées par des aplites et apparaissent aussi bien à l'intérieur de la masse plutonique que dans l'encaissant métamorphique. La distribution spatiale de ces fractures a pu être interprétée par un modèle simple dans lequel la pression des fluides joue un rôle important: cette pression détermine la valeur de la contrainte effective et conditionne les divers mécanismes de facturation, qui se traduisent dans différents systèmes de filons.
    Notes: Zusammenfassung In einigen Granit-Plutonen des Zentralextremadura-Batholithen konnte eine laterale Ausdehnung in den Endetappen ihrer Platznahme festgestellt werden. Dabei wurden verschiedene Bruchsysteme entwickelt, die im allgemeinen mit Aplit gefüllt sind und sowohl im Inneren der plutonischen Masse als auch im metamorphen Nebengestein auftreten. Die spezielle Anordnung der Bruchsysteme konnte anhand eines einfachen Modells interpretiert werden. Dabei spielt der Durchströmungsdruck eine wichtige Rolle, da er den Wert der effektiven Spannung bestimmt und verschiedene Bruchmechanismen, die sich in verschiedenen Gangsystemen widerspiegeln.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
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    Springer
    International journal of earth sciences 76 (1987), S. 101-124 
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Granitoid magmas are emplaced at the upper crust under a complex interaction of gravitational processes and horizontal tectonics. Natural intrusive bodies show a wide variety of structural patterns that must be strongly related with their dynamic history of ascent and emplacement. Comparisons of natural structural patterns with experimental and numerical models are necessary to interpret in a coherent fashion the emplacement mechanism involved. From natural, experimental, numerical and theoretical considerations one can reach important conclusions on the problem of ascent and final emplacement of granitoid magmas in the Earth's crust. The present paper reviews the principal emplacement mechanisms referred to in the literature; that is, doming, diapirism, ballooning, stoping, cauldron subsidence and dike propagation. Dike propagation is the most effektive process in magma transport from deep zones in the crust and upper mantle. Extensional fractures for dike propagation and magma ascent can be developed at depth in the crust according to the modern dike propagation theory. In orogenic domains, magmas reach the upper crust through narrow channels or dikes and are accumulated in a final reservoir in the form of a discordant supracrustal pluton or a ballooning pluton if, during emplacement, any regional deformation acts simultaneously.
    Abstract: Resumen Los magmas graníticos se emplazan en la corteza superior bajo una compleja interaccion entre procesos gravitatorios y tectónica horizontal. Los cuerpos intrusivos naturales muestran una amplia variedad de patrones estructurales que pueden estar directamente relacionados con la dinámica de ascenso y emplazamiento. Para explicar de forma cohérente el mecanismo de emplazamiento implicado en un plutón es necesario establecer comparaciones entre patrones estructurales de plutones y modelos experimentales y numéricos. A partir de consideraciones naturales, experimentales, numéricas y teóricas, se pueden extraer importantes conclusiones sobre el problema del ascenso y emplazamiento de magmas en la corteza. En este trabajo se revisan los principales mecanismos de emplazamiento referidos en la literatura; es decir, doming, diapirismo, ballooning, stoping, cauldron subsidence y propagación de diques. Propagación de diques es el proceso más efectivo en el transporte de magmas desde zonas profundas en la corteza y manto superior. De acuerdo con la moderna teoría de propagación de diques, las fracuras extensionales pueden producirse en profundidad en la corteza. En dominios orogénicos, los magmas alcanzan la corteza superior a través de estrechos canales o diques y se acumulan en un reservorio final, bien en forma de plutones discordantes supracrustales, o bien en la forma de un »ballooning pluton« si durante el emplazamiento actûa alguna deformación regional.
    Notes: Zusammenfassung Die Intrusion granitischer Magmen in die obere Krust ist das Ergebnis eines komplexen Zusammenspiels von schwerkraftbedingten Prozessen und horizontalen, tektonichen Bewegungen. Die gro\e Vielfalt tektonischer Strukturen von granitischen Plutonen spiegelt die Geschichte der Dynamik, ihres Aufstieges und ihrer Platznahme wider. Um den jeweils vorhandenen Intrusionsmechanismus zusammenhängend deuten zu können, sind Vergleiche der natürlichen, tektonischen Elemente mit experimentellen und numerischen Modellen notwendig. Hieraus lassen sich gegebenenfalls weitreichende Schlüsse zum Problem des Aufstiegs und der endgültigen Platznahme der Magmen in der Erkruste ziehen. In dieser Arbeit werden die wesentlichen Aufstiegsmechanismen von Magmen aus der Literatur diskutiert. Im Einzelnen sind dieses: Aufwölbung, Diapirismus, Aufweitung, Abbau, Kraterbildung und Gangentwicklung. Das Vordringen von Gängen ist der wirksamste Proze\ des Magmentransports aus tieferen Zonen der Kruste und des oberen Mantels. Ausdehnungsklüfte lassen sich als Ursache für das Vordringen von Gängen und den Magmenaufstieg nach der heutigen Theorie über die Entwicklung von Gängen in der tiefen Kruste herleiten. In orogenen Zonen erreichen Magmen die obere Erdkruste durch enge Kanäle oder Gänge und reichern sich dort auch in Form eines dikordanten, subkrustalen oder aufgweiteten Plutons an, wenn gleichzeitig mit der Platznahme regionaltektonische Deformationen ablaufen.
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  • 5
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    Springer
    Contributions to mineralogy and petrology 106 (1990), S. 9-26 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The mechanisms by which felsic and mafic magmas interact and approach a uniform hybrid composition through the processes of mingling and mixing have been studied in a high-level subvolcanic setting in the Spanish Hercynian at Gerena, near Seville. The compositions involved are calc-alkaline and the situation is one of tonalite-quartz diorite synplutonic dykes injected into a granitic magma chamber. The resulting hybrids include dykes, pillows and globules of tonalite with chilled margins which are variously disrupted and homogenised with the host granite. The present investigation is based on field and petrographic observations of hybridization textures, the identification of different stages in the crystallisation history of the tonalite through mineral textures, and the characterization of mineral compositions at these various stages. Proportions of the end-member magmas involved were obtained by major-oxide mixing models and tested satisfactorily with trace elements. A mechanistic model is presented to account for these observations which involves the early quenching of the tonalite when it was emplaced into the granite magma chamber. After high temperature crystallization had occurred the two magmas attained thermal equilibrium and disruption of the tonalite in the high energy regime of this subvolcanic complex resulted in dispersion of fragments and crystals through the granite giving rise to hybrid granodiorite compositions. It is argued that such high-energy flow conditions are a necessary requirement for effective hybridization in this environment in contrast to most large-scale magma chamber settings where mixing is driven by thermal and buoyancy contrasts.
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  • 6
    Electronic Resource
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    Contributions to mineralogy and petrology 120 (1995), S. 137-149 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The Gredos massif is one the better exposed granitoid complexes of the Iberian massif. It is composed mainly of peraluminous granitoids with subordinate basic and ultrabasic complexes. The massif also contains mega-enclaves of migmatites with which the granitoids show transitional contacts. Two major magmatic associations have been distinguished in this study: (1) One comprises the granitoids with microgranular enclaves, the enclaves, and basic rocks; (2) the other is formed by leucogranites, intrusive into the former series and free of microgranular enclaves. Field relationships and microstructures indicate that the rocks of the first series are related by a dominant hybridization process. The Sr-Nd isotopic study reveals that this process is complex, relating different end- members of mantle and crustal affinities, and occurred around 295 Ma ago, late with respect to the main deformation phases of the Hercynian orogeny. The granitoids with microgranular enclaves (GME) are part of an overall mixing trend involving Palaeozoic mantle-derived magma and melts of older crustal material. Amphibole-bearing GME, in general, contain greater proportions of the mantle-derived component than the cordierite-bearing GME. The actual mixing processes took place on a variety of scales, sometimes between melts which were themselves hybrids. On a local scale this hybridization process can be modelled by simple binary mixing as documented in the case of a composite dyke. The isotopic signatures of the basic rocks are probably, to a large degree, the result of interaction with crustal melts, though additionally the presence of an enriched mantle source cannot be eliminated. Microgranular enclaves and their immediate hosts have differing initial Sr and Nd isotopic signatures, indicating that isotopic equilibrium was not attained. This suggests that the enclaves did not reside in their final granitic melt for long before cooling of the whole system. The enclaves are considered to have been derived from basaltic melts which had fractionated and hybridised to varying degrees. Late-stage peraluminous leucogranites have similar initial Nd isotopic compositions to the evolved GME; a crustal source with a radically different Nd isotopic composition or age does not need to be invoked in their petrogenesis.
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  • 7
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The discrimination between potential source materials involved in the genesis of Iberian granites and granodiorites, as well as the role of mantle-crust interactions, are examined using constraints imposed by melting experiments, melting-assimilation experiments and Sr-Nd isotope systematics. The Sr-Nd isotope relationships indicate the existence of different genetic trends in which juvenile mantle materials are involved by different mechanisms: (1) a source trend, traced by a particular evolution of the pre-Hercynian basement and indicating mantle participation at the time of sedimentation; (2) a set of magmatic trends traced by gabbro-tonalite-enclave-granodiorite associations, implying the incorporation of new mantle material at the time of granite generation. These relationships strongly support a pure crustal origin for the peraluminous leucogranites, derived from partial melting of crustal protoliths, and a hybrid origin for the peraluminous granodiorites. These granodiorites are the most abundant granitic rocks of the Central Iberian zone (CIZ) of the Iberian massif, implying that processes of hybridisation by assimilation and/or magma mixing played an important role in granitoid production during the Hercynian orogeny. These hypotheses have been tested by means of melting and assimilation experiments. Melting experiments in the range 800–900 °C and at pressures of 3, 6, 10 and 15 kbar indicate that: (1) several potential source materials such as Bt-Ms gneisses and metagreywackes are suitable for the production of peraluminous leucogranite melts; (2) the melt compositions are always leucogranitic, regardless of pressure; (3) pressure exerts a strong influence on the fertility of the source: experiments at 3 kbar produce more than 20 vol% of melt, compared with less than 5 vol% of melt produced at 10 and 15 kbar and at the same temperature. The melting-assimilation experiments carried out at 1000 °C and 4, 7 and 10 kbar and using a proportion of 50% gabbro and 50% gneiss give high melt proportions (more than 50 vol.%) and noritic residues. These melts have the composition of leucogranodiorites, and overlap with part of the compositional range of peraluminous granodiorites of the Iberian massif. The generation of more mafic granodiorites may be explained by the incorporation of some residual orthopyroxene to the granodiorite magmas. The low solubility of Fe + Mg prevents the generation of granodiorite melts with more than 3 wt% of MgO + FeO at all crustal pressures. The large volumes of peraluminous, hybrid granodiorites, produced by assimilation of crustal rocks by mantle magmas, imply that an important episode of crustal growth took place during the Late-Palaeozoic Hercynian orogeny in the Iberian massif.
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  • 8
    Electronic Resource
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    Foundations of physics 21 (1991), S. 649-663 
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some postulates are introduced to go from the classical Hamilton-Jacobi theory to the quantum one. We develop two approaches in order to calculate propagators, establishing the connection between them and showing the equivalence of this picture with more known ones such as the Schrödinger's and the Feynman's formalisms. Applications of the above-mentioned approaches to both the standard case of the harmonic oscillator and to the harmonic oscillator with time-dependent parameters are made.
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  • 9
    Publication Date: 2009-12-22
    Description: Following a Middle-Late Devonian (c. 390-360 Ma) phase of crustal shortening and mountain building, continental extension and onset of high-medium-grade metamorphic terrains occurred in the SW Iberian Massif during the Visean (c. 345-326 Ma). The Evora-Aracena-Lora del Rio metamorphic belt extends along the Ossa-Morena Zone southern margin from south Portugal through the south of Spain, a distance of 250 km. This major structural domain is characterized by local development of high-temperature-low-pressure metamorphism (c. 345-335 Ma) that reached high amphibolite to granulite facies. These high-medium-grade metamorphic terrains consist of strongly sheared Ediacaran and Cambrian-early Ordovician (c. 600-480 Ma) protoliths. The dominant structure is a widespread steeply-dipping foliation with a gently-plunging stretching lineation generally oriented parallel to the fold axes. Despite of the wrench nature of this collisional orogen, kinematic indicators of left-lateral shearing are locally compatible with an oblique component of extension. These extensional transcurrent movements associated with pervasive mylonitic foliation (c. 345-335 Ma) explain the exhumation of scarce occurrences of eclogites (c. 370 Ma). Mafic-intermediate plutonic and hypabyssal rocks (c. 355-320 Ma), mainly I-type high-K calc-alkaline diorites, tonalites, granodiorites, gabbros and peraluminous biotite granites, are associated with these metamorphic terrains. Volcanic rocks of the same chemical composition and age are preserved in Tournaisian-Visean (c. 350-335 Ma) marine basins dominated by detrital sequences with local development of syn-sedimentary gravitational collapse structures. This study, supported by new U-Pb zircon dating, demonstrates the importance of intra-orogenic transtension in the Gondwana margin during the Early Carboniferous when the Rheic ocean between Laurussia and Gondwana closed, forming the Appalachian and Variscan mountains.
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  • 10
    Publication Date: 2019-03-01
    Print ISSN: 0022-2488
    Electronic ISSN: 1089-7658
    Topics: Mathematics , Physics
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