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  • 1
    Keywords: Lithosphere ; plate tectonics ; Aufsatzsammlung ; Magmatismus ; Plattentektonik ; Magmatische Lagerstättenbildung ; Plattentektonik
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (IX, 526 Seiten) , Abb
    ISBN: 090331794X
    Series Statement: Geological Society special publication 76
    DDC: 551.13
    RVK:
    Language: English
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  • 2
    Keywords: Aufsatzsammlung ; Magmatismus ; Rift ; Rifting ; Plattentektonik ; Kontinentalverschiebung ; Kontinentalverschiebung ; Magmatismus ; Bruchtektonik
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (VI, 404 Seiten)
    ISBN: 0903317834
    Series Statement: Geological Society special publication 68
    DDC: 551
    RVK:
    RVK:
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 81 (1982), S. 168-183 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The volcanic stratigraphy and trace element geochemistry of the Oman ophiolite complex indicate a multistage magmatic origin comprising: (1) magmatism due to sea-floor spreading in a marginal basin; (2) magmatism associated with discrete submarine volcanic centres or seamounts; (3) magmatism associated with crustal uplift and rifting; and (4) magmatism associated with continent-arc collision. Trace element petrogenetic modelling is used to investigate the nature of the mantle source region and the partial melting and fractional crystallization history for each magmatic event. The petrogenetic pathway for the ‘sea-floor spreading’ lavas requires a high degree of melting of a mantle that was depleted in incompatible elements prior to subduction but subsequently selectively enriched in certain elements (mostly LIL elements and H2O) from an underlying subduction zone; it also requires magma mixing in an ‘open system’ magma chamber prior to eruption. The ‘seamount’ lavas were probably derived by a similar degree of partial melting of a similar source, but fractional crystallization was restricted to smaller high-level magma chambers. The ‘rifting’ lavas were derived from a mantle source that was more depleted than the ‘seamount’ lavas prior to subduction but which was later modified by a larger subduction zone component. The ‘syn-collision’ lavas were however derived from an enriched mantle source, which probably underlay the passive continental margin rather than the marginal basin complex. Results such as these may provide considerable insight into the petrogenetic changes accompanying the transitions from spreading to arc volcanism in a supra-subduction zone setting.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The environmentalist 17 (1997), S. 197-208 
    ISSN: 1573-2991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Voluntary environmental reporting on the progress achieved against policy objectives is an emerging trend in industry and business and is recognized as a valuable aid in implementing policy and improving environmental management systems. Environmental reporting in the UK, has a whole range of formats including PERI, GEMI, WICE and EMAS, with the last, in particular, aiming to improve the level of environmental stewardship and to increase the flow of environmental information to audiences both internally and externally. Higher education institutions globally have been slow to respond in this respect and there is much that they can learn from corporate environmental reporting. An environmental policy is not sufficient proof of commitment for those institutions who have signed the global Talloires Declaration or the European COPERNICUS Charter: demonstrable progress in policy implementation is essential. The environmental management systems that higher education institutions adopt or create and the ways in which their environmental information is collated are of great significance, but the medium selected for the report is perhaps one of the most important aspects to consider. Those institutions such as the University of Sunderland, UK who are using the World Wide Web have been able to produce a flexible, hypertext-linked service on request with inbuilt feedback mechanisms containing varied, up-to-date, comprehensive and well-structured environmental information signposted to external pro-active institutions and agencies. These reports have unique educational angles and reveal links and networks that are naturally more pervasive and far-reaching in their scope and impact and could well provide a key way forward to practical and sustainable environmental reporting into the millennium.
    Type of Medium: Electronic Resource
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