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  • Darfur Dome  (2)
  • Dike rocks  (2)
  • Pan-African  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The Darfur Dome, western Sudan: the product of a subcontinental mantle plume (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 614-623 
    Details
    ISSN: 1437-3262
    Keywords: Darfur Dome ; Mantle plume ; Intracontinental volcanism ; Alkaline magmas ; K-Ar age data Bouguer gravity anomaly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Field investigations, K-Ar age determinations and chemical data were used to describe the development of an intraplate volcanic province, the Darfur Dome, Sudan. Magmatism started 36 Ma ago at a small subvolcanic complex (Jebel Kussa) in the center of the dome and was active in the same area between 26 and 23 Ma. Two major volcanic fields (Marra Mountains and Tagabo Hills) developed between 16 and 10 Ma. Volcanism started again at 6.8 Ma with a third volcanic field (Meidob Hills) and at 4.3 Ma in the Marra Mountains and with the reactivation of the center. Activity then continued until the late Quaternary. Having started in the center of the Darfur Dome, volcanism moved in 36 Ma 200 km towards the NNE and 100 km SSW No essential difference in the alkaline magma types (basanitic to phonolitic-trachytic, with different amounts of assimilation of crustal material) in the different fields, was observed. Magmatism is thought to have been produced by a rising mantle plume and volcanism was triggered by stress resolution along the Central African Fault Zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194166
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Darfur Dome, western Sudan: the product of a subcontinental mantle plume (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 614-623 
    Details
    ISSN: 1437-3262
    Keywords: Darfur Dome ; Mantle plume ; Intracontinental volcanism ; Alkaline magmas ; K-Ar age data Bouguer gravity anomaly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Field investigations, K-Ar age determinations and chemical data were used to describe the development of an intraplate volcanic province, the Darfur Dome, Sudan. Magmatism started 36 Ma ago at a small subvolcanic complex (Jebel Kussa) in the center of the dome and was active in the same area between 26 and 23 Ma. Two major volcanic fields (Marra Mountains and Tagabo Hills) developed between 16 and 10 Ma. Volcanism started again at 6.8 Ma with a third volcanic field (Meidob Hills) and at 4.3 Ma in the Marra Mountains and with the reactivation of the center. Activity then continued until the late Quaternary. Having started in the center of the Darfur Dome, volcanism moved in 36 Ma 200 km towards the NNE and 100 km SSW No essential difference in the alkaline magma types (basanitic to phonolitic-trachytic, with different amounts of assimilation of crustal material) in the different fields, was observed. Magmatism is thought to have been produced by a rising mantle plume and volcanism was triggered by stress resolution along the Central African Fault Zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01083232
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dike rock generation and magma interactions in the Bir Safsaf igneous complex, south-west Egypt: Implications for the Pan-African evolution in north-east Africa (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 523-536 
    Details
    ISSN: 1437-3262
    Keywords: Pan-African ; SW-Egypt ; Dike rocks ; Calcalkaline dikes ; Tholeiitic dikes ; S-Nd isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The geological setting, ages, petrography and geochemistry of late Pan-African (≈ 580 Ma) calc-alkaline and tholeiitic dike rocks in the Bir Safsaf igneous complex of south-west Egypt are discussed. These basaltic to rhyolitic dikes intruded contemporaneously and shortly after the intrusion of granitoids. The major and trace element data, Sr and Nd isotope relations, in combination with textural observations, confirm complex interactions between most of the intermediate calcalkaline dike melts and plutonic melts, with different degrees of mixing, assimilation, replenishment and tapping of magma chambers. Trachytic and rhyolitic dikes are strongly differentiated melts from the granitic pluton. The tholeiitic dikes evolved dominantly by fractional crystallization processes. It is inferred that open system and closed system processes operated in calc-alkaline magma chambers, and that the calc-alkaline melts came from a garnet-and amphibole-bearing mantle, modified by a subduction component. Tholeiitic rocks were formed later by fractional crystallization and assimilation processes. Magma ascent of both dike types took place in an extensional environment and the presumed subduction zone has to be seen in connection with the Atmur-Delgo suture zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194159
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  • 4
    Electronic Resource
    Electronic Resource
    Dike rock generation and magma interactions in the Bir Safsaf igneous complex, south-west Egypt: Implications for the Pan-African evolution in north-east Africa (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 523-536 
    Details
    ISSN: 1437-3262
    Keywords: Pan-African ; SW-Egypt ; Dike rocks ; Calcalkaline dikes ; Tholeiitic dikes ; S-Nd isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The geological setting, ages, petrography and geochemistry of late Pan-African (≈ 580 Ma) calc-alkaline and tholeiitic dike rocks in the Bir Safsaf igneous complex of south-west Egypt are discussed. These basaltic to rhyolitic dikes intruded contemporaneously and shortly after the intrusion of granitoids. The major and trace element data, Sr and Nd isotope relations, in combination with textural observations, confirm complex interactions between most of the intermediate calcalkaline dike melts and plutonic melts, with different degrees of mixing, assimilation, replenishment and tapping of magma chambers. Trachytic and rhyolitic dikes are strongly differentiated melts from the granitic pluton. The tholeiitic dikes evolved dominantly by fractional crystallization processes. It is inferred that open system and closed system processes operated in calc-alkaline magma chambers, and that the calc-alkaline melts came from a garnet-and amphibole-bearing mantle, modified by a subduction component. Tholeiitic rocks were formed later by fractional crystallization and assimilation processes. Magma ascent of both dike types took place in an extensional environment and the presumed subduction zone has to be seen in connection with the Atmur-Delgo suture zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01083225
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    Paper (German National Licenses)
    Fulltext
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