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  • 11
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    Element mobility in paragneisses and metabasites of the Continental Deep Drilling Project (KTB/Germany) (1997)
    Springer
    Details
    Publication Date: 1997-06-30
    Print ISSN: 0016-7835
    Electronic ISSN: 1432-1149
    Topics: Geosciences
    Published by Springer
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  • 12
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    Crystallization behaviour of CaBa(PO3)4 glass depending on temperature and load (1991)
    Elsevier
    Details
    Publication Date: 1991-01-01
    Print ISSN: 0022-3093
    Electronic ISSN: 1873-4812
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 13
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    First40Ar/39Ar age constraints for the Caledonian evolution of the Trans–European Suture Zone in NE Germany (1999)
    Geological Society of London
    Details
    Publication Date: 1999-03-01
    Print ISSN: 0016-7649
    Topics: Geosciences
    Published by Geological Society of London
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  • 14
    Electronic Resource
    Electronic Resource
    Detrital composition of Ordovician sandstones from the Rügen boreholes: implications for the evolution of the Tornquist Ocean (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 293-308 
    Details
    ISSN: 1437-3262
    Keywords: Rügen boreholes ; Palaeogeographic reconstructions ; Provenance studies ; Sedimentary sequences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Lower Palaeozoic sequences of the Rügen boreholes are composed of pelitic-clastic sediments which range in age from the Cambro-Ordovician boundary to the Late Ordovician. Provenance studies have been carried out on Cambro-Ordovician sandstones from the Loissin borehole and on Middle-Upper Ordovician greywackes of the Rugen 5 borehole. The Loissin sandstones were deposited as turbidites and debris flows in an unstable sedimentary basin. They form immature arkoses and subarkoses with high matrix contents. Their debris derived from a polycyclic, sedimentary cratonic provenance and from a monocyclic magmatic provenance. This is reflected in the heavy mineral spectrum, which is dominated by an anhedral, coloured zircon fraction and a euhedral, transparent zircon fraction. The Middle-Upper Ordovician Rügen greywackes derived from proximal, high energy turbidites which were transported into a deep marine basin. They form homogeneous lithic arkoses and arkosic litharenites. Their debris derived from a composite provenance with an ultramafic-mafic, ophiolitic source, an acidic magmatic source and a heterogeneous sedimentary cratonic source. Although the Loissin sandstones probably originated in an intracratonic, rift-related sedimentary basin, the debris of the Rugen greywackes is regarded as derived from a heterogeneous active continental margin. Results and interpretations of the provenance study are discussed in the light of proposed Lower Palaeozoic palaeogeographic reconstructions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210546
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  • 15
    Electronic Resource
    Electronic Resource
    Element mobility in paragneisses and metabasites of the Continental Deep Drilling Project (KTB/Germany) (1997)
    Springer
    Geologische Rundschau 86 (1997), S. S184 
    Details
    ISSN: 0016-7835
    Keywords: Key words Leaching experiment ; Cation-exchange resin ; Alteration ; Hydrothermal fluids ; Element transport ; Shear zone ; Factor analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Leaching experiments (pH=3, T=70 °C) have been performed on paragneisses and metabasites from the KTB drill cores. The experiments yielded the fraction of total element content that is easily available to acidic aqueous fluids. The intensity of mineralogic alteration in the studied samples is expressed in terms of easily leachable fractions of K or Ba. Its reliability is shown by correlation with a petrographically determined alteration index. For the paragneisses, the easily available fractions of Fe, Mg, Mn, Ca, Na, K, Ba, Co, Cr, Ni, Sr, V, and Y together with the variables whole-rock content and depth of samples were subjected to a factor analysis, the results of which are presented as a five-factor model. Correlation plots of easily leachable element fraction and whole-rock content vs an alteration index (percentage of leachable K) reveal the changes in leachability as a function of intensity of alteration. In a cataclastic boundary between paragneisses and metabasites at 1610 m depth, the changes in whole-rock content and leachability of elements are studied in detail and compared with the general trends in alteration. The results point to considerable intercrystalline element redistribution during retrograde metamorphism, with only insignificant element transport on a meter scale. Although considerable fractions of many elements were easily available to acidic fluids (3〈pH〈4) in the experiments, the whole-rock element content was maintained during retrogression, suggesting that water/rock ratio and fluid flow were low. During alteration K, Ba, Fe, Co, Ni, Cr, and V are immobilized in situ, whereas Sr, Ca, and Y become more leachable. Across the studied, strongly altered, lithologic contact, element transport up to 7 m normal to foliation can be traced. Here, Ca, Sr, Mg, Co, Ni, and Cr are slightly enriched, whereas K, Ba, Fe, and Mn are slightly depleted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00014653
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  • 16
    Electronic Resource
    Electronic Resource
    Structural framework of the Bashkirian anticlinorium, SW Urals (1999)
    Springer
    Geologische Rundschau 87 (1999), S. 526-544 
    Details
    ISSN: 0016-7835
    Keywords: Key words Structural analysis ; Bashkirian anticlinorium ; SW Urals ; URSEIS '95 profile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Bashkirian anticlinorium of the southwestern Urals shows a much more complex structural architecture and tectonic evolution than previously known. Pre-Uralian Proterozoic extensional and compressional structures controlled significantly the Uralian tectonic convergence. A long-lasting Proterozoic rift process created extensional basement structures and a Riphean basin topography which influenced the formation of the western fold-and-thrust-belt with inversion structures during the Uralian deformation. A complete orogenic cycle during Cadomian times, including terrane accretion at the eastern margin of the East European platform, resulted in a high-level Cadomian basement complex, which controlled the onset of Uralian deformation, and resulted in intense imbrication and tectonic stacking in the subjacent footwall of the Main Uralian fault. The Uralian orogenic evolution can be subdivided into three deformation stages with differently oriented stress regimes. Tectonic convergence started in the Late Devonian with ophiolite obduction, tectonic accretion of basin and slope units and early flysch deposits (Zilair flysch). The accretionary complex prograded from the SE to the NW. Continuous NW/SE-directed convergence resulted finally in the formation of an early orogenic wedge thrusting the Cadomian basement complex onto the East European platform. The main tectonic shortening was connected with these two stages and, although not well constrained, appears to be of Late Devonian to Carboniferous age. In the Permian a final stage of E–W compression is observed throughout the SW Urals. In the west the fold-and-thrust-belt prograded to the west with reactivation of former extensional structures and minor shortening. In the east this phase was related to intense back thrusting. The East European platform was subducted beneath the Magnitogorsk magmatic arc during the Late Paleozoic collision. The thick and cold East European platform reacted as a stable rigid block which resulted in a narrow zone of intense crustal shortening, tectonic stacking and high strain at its eastern margin. Whereas the first orogenic wedge is of thick-skinned type with the involvement of crystalline basement, even the later west-directed wedge is not typically thin-skinned as the depth of the basal detachment appears below 15 km and the involvement of Archean basement can be assumed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050229
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  • 17
    Electronic Resource
    Electronic Resource
    Incipient metamorphism between Ufa and Beloretzk, western fold-and-thrust belt, southern Urals, Russia (1999)
    Springer
    Geologische Rundschau 87 (1999), S. 545-560 
    Details
    ISSN: 0016-7835
    Keywords: Key words incipient metamorphism ; Southern Urals ; Clay mineral crystallinity ; Vitrinite reflectance ; Conodont color alteration index (CAI)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The low-temperature thermal history of Paleozoic and Precambrian shales and slates was studied in detail along a NW–SE transect between Ufa and Beloretzk in the western fold-and-thrust belt of the southern Urals, Russia. The aim of the investigations was to compare four thermal parameters, namely illite and chlorite crystallinity, vitrinite reflectance, and Conodont color alteration index (CAI), in order to quantify the finite (i.e. maximum) thermal grade. The transect extends from Devonian to Permian sedimentary units of the pre-Uralian foredeep, crossing Precambrian siliciclastic and carbonate units of the Bashkirian megaanticlinorium into the Paleozoic units of the Ural-Tau antiform. In general, the four methods indicate similar metamorphic grades of the samples. The finite thermal grade ranges from lower diagenesis (Ro=0.9%, CIS-FWHMill001ad=0.770 Δ°2Θ, CIS-FWHMchl002ad=0.447 Δ°2Θ, CAI=1.5) in the pre-Uralian foredeep to epizone (CIS-FWHMill001ad=0.243 Δ°2Θ, CIS-FWHMchl002ad=0.252 Δ°2Θ, CAI=6) in the eastern part of the Bashkirian mega-anticlinorium and the Zilair synclinorium. All parameters show a sudden change in value at thrust boundaries and an increase in metamorphic grade with stratigraphic age within structural units. In comparison, the westernmost Precambrian units of the Ala-Tau-anticlinorium are characterized by thermal grades of lower diagenesis. Magmatic dikes cause a wide variation of the thermal grade in the western part of the Bashkirian megaanticlinorium. Also in areas with an intensive cleavage development (Zilair synclinorium) the finite thermal grade shows a stronger relationship towards the deformation than the stratigraphic position.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050230
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  • 18
    Electronic Resource
    Electronic Resource
    Voltammetrische Bestimmung von Metallionen hoher Konzentration in einer Durchflußzelle an Glascarbon-Elektroden (1985)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 322 (1985), S. 334-335 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Durch extrem kurze Vorelektrolysezeiten und eine hohe Scan-Rate ist es möglich, hohe Konzentrationen an Metallionen in wäßrigen Lösungen ohne vorherige Verdünnung quantitativ invers-voltammetrisch zu bestimmen. Für die exemplarisch untersuchten Elemente Blei und Cadmium betragen die Obergrenzen etwa 100 g/l. Damit ist es möglich, mit einer relativ einfachen und preiswerten Meßapparatur über einen Konzentrationsbereich von ca. 10 Zehnerpotenzen zu arbeiten. Das Verfahren ist mit geringem Aufwand automatisierbar und bei Bedarf auch zur Prozeßsteuerung ausbaubar. Von einer Vielzahl von Anwendungsmöglichkeiten sei die gleichzeitige Badkontrolle und Abwasserüberwachung in galvanischen Betrieben genannt.
    Notes: Summary An inverse-voltammetric method, well known for the determination of metal ions in the ppm to ppb range is now extended for determining high concentrations from aqueous solutions without prior dilution. The feasibility of this method is demonstrated for lead and cadmium up to concentrations of about 100 g/l. Automation and processing is possible. This technique can be used to solve several analytical problems, e. g. for the simultaneous determination of components in an electrochemical bath and in waste water of a galvanotechnical factory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00490919
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  • 19
    Electronic Resource
    Electronic Resource
    Determination of chlorinated hydrocarbons in single and multi component test gases (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 610-614 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary For comparing the efficiency of active and diffusive sampling methods two diffusive samplers with different properties were used to determine chlorinated hydrocarbons (CH2Cl2, CHCl3, CCl4) in single and multi component test gas mixtures. One of the chosen diffusive samplers can also be used for active sampling. In general, good correlations of all tested methods could be observed in the direct comparison of active and diffusive sampling and in the determination of the efficiencies. During the application of active and diffusive sampling methods in multi component test gases of the analytes possible interferences could not be ascertained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324018
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  • 20
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    Age constraints for the tectonometamorphic evolution of the Pulo do Lobo zone in SW Spain (1999)
    In:  Zeitschrift der Deutschen Geologischen Gesellschaft
    Details
    Publication Date: 2020-02-12
    Description: Combined geological, structural, petrological and radiometric investigations provide constraints for the polyphase Variscan tectonothermal evolution of the Pulo de Lobo Zone in SW Spain. First phase deformation structures are intensively overprinted and only preserved in microlithons of the second Variscan phase. As Late Devonian overstep sequences are undeformed by the first Variscan deformation, this phase can be dated around the Frasnian/Famennian boundary. It argues for an early accretion of the Pulo do Lobo Zone to the Ossa-Morena Zone which was terminated in the late Devonian. During the Early Carboniferous the Pulo do Lobo Zone was successively deformed and sandwiched inbetween the Ossa-Morena Zone and the South Portuguese Zone. Oblique convergence resulted in a prominent phase of transpression. This stage comprises the second and third Variscan deformation phase, both with SSW directed thrusting and left-lateral displacement. Synkinematic intrusions started to ascend contemporaneously. Their final emplacement occured between the second and third deformation phase, cooling of the intrusions outlasted the third Variscan phase. The regional metamorphism of the Pulo do Lobo Zone reaches in the basal units upper greenschist to lower amphibolite facies conditions. The metamorphism is connected with the second Variscan deformation phase. As it is closely associated with a wide-spread contact metamorphism, the Spanish part of the Pulo do Lobo Zone appears widely underlain by synkinematic intrusions. The timing of transpression in the Pulo do Lobo Zone can be constrained by 40Ar/39Ar and 87Rb/86Sr isotope dates of synkinematic intrusions which range between 337 Ma and 328 Ma. They are interpreted as cooling ages and can be related to microstructural observations in the contact aureole of the intrusives. According to this Variscan transpression. low-grade metamorphism and magmatism occured almost contemporaneously in the late Visean and was terminated by the end of the Early Carboniferous. The Variscan deformation of the Pulo do Lobo Zone ended with left-lateral movements along previously generated thrusts during the late Carboniferous.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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