Reconstruction of eroded monogenic Strombolian cones of Miocene age: A case study on character of volcanic activity of the Jičín Volcanic Field (NE Bohemia) and subsequent erosional rates estimation

Vladislav Rapprich, Vladimír Cajz, Martin Košťák, Zoltán Pécskay, Tomáš Řídkošil, Pavel Raška, Miroslav Radoň

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Relics of solitary volcanic edifices in NE Bohemia were newly interpreted as remnants of scoria cones and their conduits. Volcanic activity in this area occurred in a form of scattered Strombolian eruptions of basanitic magmas mostly ascending along E-W trending faults. Nearly all studied volcanoes erupted in-similar style, Strombolian, mostly not producing larger lava flows. This volcanic activity took place mainly during Mocene (24.6-16.5 Ma). The lavas known on the Kozákov Hill were produced by much younger volcanic activity (6.7-3.5 Ma) and one of the studied locations is supposed to represent their feeder. The older Strombolian cones are relatively weakly affected by weathering processes. The erosional level at individual sites depends on geomorphology. On some of the edifices non-welded, poorly stratified scoriae are well preserved, at other sites a basal facies or upper vent facies were exposed by selective erosion. Interpretation of the exposed facies with the use of radiometric data brought new insight in relief evolution of this area. Erosion of Cretaceous marine deposits was very intensive during Oligocene, whereas during the last 17 M.y. only some 70 m of weak sediments were eroded.

Original languageEnglish
Pages (from-to)169-180
Number of pages12
JournalJournal of Geosciences
Volume52
Issue number3-4
DOIs
Publication statusPublished - Dec 1 2007

Keywords

  • Bohemian Paradise GeoPark
  • Cinder cone
  • Erosion rate
  • Jičín Volcanic Field
  • Strombolian eruption
  • Volcanic facies

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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