Middle Permian reef complex on the Velebit Mt.

Marjanac, Tihomir and Sremac, Jasenka (1999) Middle Permian reef complex on the Velebit Mt.. In: Harold Reading's IAS Lecture Tour '99 (Croatia), Field-trip Guidebook: Some carbonate and clastic successions of the External Dinarides - Velebit Mt., Island of Rab. The Institute of Geology Zagreb, Zagreb, pp. 4-8.

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Abstract

The superimposed Middle Permian carbonate bodies near Baške oštarije are interpreted as ecological and morphological reef complex, based on their characteristic fossil association, body geometry, and characteristic internal organisation. The superposition of the reefal bodies and the sediments studied document rapid sea-level changes, so that reef vertical growth was aborted during relative sea-level falls, and resumed during sea-level rise. Subaerial weathering created debris which was deposited in internal cavities and voids - further reducing the porosity, and on the reef flanks. The reef main body, as well as the flanking debris was levelled by weathering during relative sea-level falls, so that at the time of renewed colonization the substrate was virtually flat. The reef evolution can be summarized in 7 phases: 1. substrate colonization 2. formation of primary reef framework with dwellers 3. reef framework incrustation 4. early lithification 5. shallowing (relative sea-level fall) followed by weathering and erosion 6. infilling of secondary reef porosity 7. deepening (relative sea-level rise) followed by recolonization (or final burial as after reef body C)

Item Type: Book Section
Keywords: Permian, reef, Velebit Mt.
Date: 1999
Subjects: NATURAL SCIENCES > Geology
Divisions: Faculty of Science > Department of Geology
Publisher: The Institute of Geology Zagreb
Depositing User: Sonja Borak
Date Deposited: 21 Feb 2014 11:52
Last Modified: 21 Feb 2014 11:53
URI: http://digre.pmf.unizg.hr/id/eprint/467

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