ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Collection
Years
  • 1
    facet.materialart.
    Unknown
    The mantle-plume model, its feasibility and consequences (1981)
    In:  Leidse Geologische Mededelingen (0075-8639) vol.52 (1981) nr.1 p.73
    Details
    Publication Date: 2014-10-27
    Description: High beat-flow foci on the Earth have been named ‘hot-spots’ and are commonly correlated with ‘mantle-plumes’ in the deep. A mantle plume may be described as a portion of mantle material with a higher heat content than its surroundings. The intrusion of a mantle-plume is inferred to be similar to the intrusion of a salt diapir and the process of diapirism is discussed. The theoretical mechanistic and thermal effects of hot diapirs and the tectonic and metamorphic implications are discussed. Two sets of diapirs, i.e. a first order diapir equal to a mantle-plume and, originating from it, second order diapirs causing hot spots, are invoked to give a reasonable explanation for the Palaeozoic evolution of the continental lithosphere of Western Galicia (NW Spain); the heat-flow pattern in the Rio Grande rift is also elegantly explained in a similar way. The sources of heat that might cause a mantle-plume are discussed but no one can be singled out as the most plausible. Mantle-plumes may be held responsible for the creation of a zone of weakness that is essential to initiate seafloor spreading, but certainly not every mantle-plume will play that role. The behavioural parameters of a mantle-plume are briefly explored and it is inferred that the heat content might be the most important one.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    Geochronological, geochemical and geophysical investigations in the high-grade mafic-ultramafic complex at Cabo Ortegal and other pre-existing elements in the Hercynian basement of Galicia (NW Spain) (1978)
    In:  Leidse Geologische Mededelingen (0075-8639) vol.51 (1978) nr.1 p.57
    Details
    Publication Date: 2014-10-27
    Description: Mafic and ultramafic rocks from a high-grade complex at Cabo Ortegal in NW Spain were investigated in the field and in the laboratory by means of petrological, isotope-geochronological and geochemical methods. Isotope-geochronological methods were applied to orthogneisses from a high-grade complex near Mellid and from the blastomylonitic graben between Malpica and Tuy, a mica-bearing eclogite lens from the same graben, and to a two-mica granite from the area near La Guardia. A gravity survey was carried out in part of the belt of sub-circular complexes surrounding the Ordenes basin. The geochronological investigations revealed ages of about 500 Ma to 320 Ma for older elements in the Hercynian basement of Galicia. Geochemical investigations in the Cabo Ortegal complex showed that the granulites and eclogites form a group that was part of an older, pre-existing continental crust. The ultramafic rocks of the Cabo Ortegal complex may have been derived in two melting episodes from a proposed mantle-plume. It is possible that the metagabbros in the complex originated in the second melting episode. The gravity survey showed the existence of three positive anomalies, situated below high-grade complexes near Santiago de Compostela, near Mellid and near Sobrado, that can be interpreted as ultramafic diapirs. A model involving continental rifting, mantle-plume diapirism, rejuvenation of the lower crust and initial seafloor-spreading is proposed for the evolution of the Early Palaeozoic continental lithosphere of the northwestern Iberian Peninsula.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    facet.materialart.
    Unknown
    Geochronological, geochemical and geophysical investigations in the high-grade mafic-ultramafic complex at Cabo Ortegal and other pre-existing elements in the Hercynian basement of Galicia (NW Spain) (1978)
    In:  Leidse Geologische Mededelingen vol. 51 no. 1, pp. 57-61
    Details
    Publication Date: 2024-01-12
    Description: Mafic and ultramafic rocks from a high-grade complex at Cabo Ortegal in NW Spain were investigated in the field and in the laboratory by means of petrological, isotope-geochronological and geochemical methods. Isotope-geochronological methods were applied to orthogneisses from a high-grade complex near Mellid and from the blastomylonitic graben between Malpica and Tuy, a mica-bearing eclogite lens from the same graben, and to a two-mica granite from the area near La Guardia. A gravity survey was carried out in part of the belt of sub-circular complexes surrounding the Ordenes basin.\nThe geochronological investigations revealed ages of about 500 Ma to 320 Ma for older elements in the Hercynian basement of Galicia. Geochemical investigations in the Cabo Ortegal complex showed that the granulites and eclogites form a group that was part of an older, pre-existing continental crust. The ultramafic rocks of the Cabo Ortegal complex may have been derived in two melting episodes from a proposed mantle-plume. It is possible that the metagabbros in the complex originated in the second melting episode. The gravity survey showed the existence of three positive anomalies, situated below high-grade complexes near Santiago de Compostela, near Mellid and near Sobrado, that can be interpreted as ultramafic diapirs.\nA model involving continental rifting, mantle-plume diapirism, rejuvenation of the lower crust and initial seafloor-spreading is proposed for the evolution of the Early Palaeozoic continental lithosphere of the northwestern Iberian Peninsula.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 4
    facet.materialart.
    Unknown
    The mantle-plume model, its feasibility and consequences (1981)
    In:  Leidse Geologische Mededelingen vol. 52 no. 1, pp. 73-76
    Details
    Publication Date: 2024-01-12
    Description: High beat-flow foci on the Earth have been named \xe2\x80\x98hot-spots\xe2\x80\x99 and are commonly correlated with \xe2\x80\x98mantle-plumes\xe2\x80\x99 in the deep. A mantle plume may be described as a portion of mantle material with a higher heat content than its surroundings. The intrusion of a mantle-plume is inferred to be similar to the intrusion of a salt diapir and the process of diapirism is discussed. The theoretical mechanistic and thermal effects of hot diapirs and the tectonic and metamorphic implications are discussed. Two sets of diapirs, i.e. a first order diapir equal to a mantle-plume and, originating from it, second order diapirs causing hot spots, are invoked to give a reasonable explanation for the Palaeozoic evolution of the continental lithosphere of Western Galicia (NW Spain); the heat-flow pattern in the Rio Grande rift is also elegantly explained in a similar way. The sources of heat that might cause a mantle-plume are discussed but no one can be singled out as the most plausible. Mantle-plumes may be held responsible for the creation of a zone of weakness that is essential to initiate seafloor spreading, but certainly not every mantle-plume will play that role. The behavioural parameters of a mantle-plume are briefly explored and it is inferred that the heat content might be the most important one.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 5
    facet.materialart.
    Unknown
    Mafic and related complexes in Galicia: an excursion guide (1978)
    In:  Leidse Geologische Mededelingen vol. 51 no. 1, pp. 63-88
    Details
    Publication Date: 2024-01-12
    Description: In Galicia occur several polymetamorphic complexes that contain mafic and ultramafic rocks. Mafic volcanics and gabbros are situated in or near the complexes. An episode of metamorphism and granitization encompassed the generation of the volcanics and gabbros. Gravity surveys revealed the existence of deep roots below polymetamorphic complexes. Geochronological investigations yielded Palaeozoic ages from about 500 Ma for the generation of ultramafic rocks and calcalkaline granite series, till ages of around 300 Ma for postkinematic alkaline and calcalkaline granites. A model involving mantle-plume diapirism and rejuvenation of the lower crust is proposed for the Early Palaeozoic evolution of the continental lithosphere of Galicia.\nAn excursion route is given, leading along 22 exposures of mostly mafic and ultramafic rocks, to be visited in 4 1/2 days.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 6
    facet.materialart.
    Unknown
    Catalogue of meteorites in Dutch collections (1979)
    In:  Scripta Geologica vol. 51, pp. 1-32
    Details
    Publication Date: 2024-01-12
    Description: This catalogue contains information on the meteorite collections presently on display or on storage in The Netherlands. It is organized in three separate listings. The first and shortest listing gives the meteorite names grouped according to their classification. The second listing is the main body of this catalogue and gives the meteorite names in alphabetical order with specific information on place and date of fall or find, classification, chemical and structural composition, registration number and weight. This information is mainly based on the \'Catalogue of Meteorites\' by Hey (1966) and the \'Appendix to the Catalogue of Meteorites\' by Hutchison, Bevan & Hall (1977). The third listing gives the meteorite names and their classification grouped separately for each of the eight participating institutions in numerical order of the registration numbers.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...