Oslo-Gebiet  -  Vulkanite  -  Rhombenporphyr RP2

RP2a: "The lower type of RP2 carries scattered small and irregular feldspar phenocrysts. This type is charakterized by its twinned phenocrysts. Every crystal is twinned in some way, and star slusters containing up to twelve twinned individuels are fairly frequent. The Baveno twin law plays an important role." (Holtedahl & Dons 1966, S. 76)
 
  1 
Rhombenporphyr
Rhombenporphyr
RP 2a Krogskogen, leg. K.-D. Meyer 1966, Geozentrum Hannover        (rechts unter geschliffene Fläche)
  2 
Rhombenporphyr
Rhombenporphyr
   RP 2a  Krogskogen,
   leg. K.-D. Meyer 1966,
   Geozentrum Hannover
 
  3 
RP2b:
"The upper part of RP2 (RP2b) has still fewer and smaller phenocrysts... The RP2b flow is only 10 m thick."
(Holtedahl & Dons 1966, S. 76)
Rhombenporphyr Rhombenporphyr
    RP 2b  Krogskogen,
   leg. K.-D. Meyer 1966,
   Geozentrum Hannover
 
  4
Rhombenporphyr
    RP 2b  Krogskogen,
   leg. K.-D. Meyer 1966,
   Geozentrum Hannover
 
 
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zur Übersicht Rhombenporphyr
zur Übersicht Krogskogen
zur Übersichtskarte Rhombenporphyre Lokalität 10
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