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  • Plinian  (2)
  • Key words Explosive volcanism  (1)
  • 1995-1999  (3)
Collection
Keywords
Publisher
Years
  • 1995-1999  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Mixed deposits of complex magmatic and phreatomagmatic volcanism: an example from Crater Hill, Auckland, New Zealand (1996)
    Springer
    Bulletin of volcanology 58 (1996), S. 59-66 
    Details
    ISSN: 1432-0819
    Keywords: Key words Explosive volcanism ; Magmatic ; Phreatomagmatic ; Crater Hill ; Basalt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  A series of alternating phreatomagmatic ("wet") and magmatic ("dry") basaltic pyroclastic deposits forming the Crater Hill tuff ring in New Zealand contains one unit (M1) which can only be interpreted as the products of mixing of ejecta from simultaneous wet and dry explosions at different portions of a multiple vent system. The principal characteristics of M1 are (a) rapid lateral changes in the thicknesses of, and proportions in juvenile components in individual beds, and (b) wide ranges of juvenile clast densities in every sample. M1 appears to have been associated with an elongate source of highly variable and fluctuating magma : water ratios and magma discharge rates. This contrasts with the only other documented mixed (wet and dry) basaltic pyroclastic deposits where mixing from two point sources of quite different but stable character has been inferred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050126
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Vent migration and changing eruptive style during the 1800a Taupo eruption: new evidence from the Hatepe and Rotongaio phreatoplinian ashes (1995)
    Springer
    Bulletin of volcanology 57 (1995), S. 432-439 
    Details
    ISSN: 1432-0819
    Keywords: Taupo eruption ; Plinian ; Phreatoplinian ; Vent migration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The 1800a Taupo eruption was one of the most complex silicic eruptions worldwide within the past 5000 years. New work on phases 3 and 4, the Hatepe and Rotongaio ashes, has identified a mappable internal stratigraphy for each, enabling detailed isopach and isopleth measurements for subunits within the deposits. The new data indicate that the vent configuration for the Taupo eruption was more complex than previously thought and involved at least three sources on a NE-SW fissure centred on Horomatangi Reefs. Phases 1–3 of the eruption were from a southwestern vent(s), phase 4 from a northeastern source, and phases 5 and 6 probably from the Horomatangi Reefs area. A separate source for the Rotongaio ash (phase 4) helps explain the contrast between the pumice-rich phases of the eruption and the dense juvenile clasts of the Rotongaio ash. The Rotongaio magma resided in a separate, initially blind conduit and was degassing prior to and during earlier phases of the Taupo eruption. This new work on the Hatepe and Rotongaio ashes underscores the importance of a detailed stratigraphic framework in deciphering extremely fine-grained fall units of largescale sustained eruptions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300987
    Location Call Number Expected Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Vent migration and changing eruptive style during the 1800a Taupo eruption: new evidence from the Hatepe and Rotongaio phreatoplinian ashes (1995)
    Springer
    Bulletin of volcanology 57 (1995), S. 432-439 
    Details
    ISSN: 1432-0819
    Keywords: Key words Taupo eruption ; Plinian ; Phreatoplinian ; Vent migration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The 1800a Taupo eruption was one of the most complex silicic eruptions worldwide within the past 5000 years. New work on phases 3 and 4, the Hatepe and Rotongaio ashes, has identified a mappable internal stratigraphy for each, enabling detailed isopach and isopleth measurements for subunits within the deposits. The new data indicate that the vent configuration for the Taupo eruption was more complex than previously thought and involved at least three sources on a NE–SW fissure centred on Horomatangi Reefs. Phases 1–3 of the eruption were from a southwestern vent(s), phase 4 from a northeastern source, and phases 5 and 6 probably from the Horomatangi Reefs area. A separate source for the Rotongaio ash (phase 4) helps explain the contrast between the pumice-rich phases of the eruption and the dense juvenile clasts of the Rotongaio ash. The Rotongaio magma resided in a separate, initially blind conduit and was degassing prior to and during earlier phases of the Taupo eruption. This new work on the Hatepe and Rotongaio ashes underscores the importance of a detailed stratigraphic framework in deciphering extremely fine-grained fall units of large-scale sustained eruptions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300987
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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