English: Velebit breccia (“Jelar” breccia), CroatienDinaric Alps, Velebit.
Geology: The carbonate breccia are chaotically fractured by strong tectonics of Middle Eocene to Middle Miocene age. They outcrop on the SW slope of the Velebit over a distance of more than 100km, also along the complete WE striking ‘Bakovac-graben’ and the Lika region. The broken zone is an essential feature of uvalas, distinguished from sinkholes by size and genesis. Uvalas are generated both by karstification and considerable faulting. Part of the breccia was diageneticallycemented by fine crystalline mass. Where not totally cemented, it is highly water permeable (karst).
Tektonik und Wasserlöslichkeit des Karbonatgesteins sind in den Dinariden sehr ausgeprägte Erscheinungen. Am Südwest-Hang des Velebit-Gebirges sind die Jelar-Brekzien über mehr als 100km aufgeschlossen, außerdem auch entlang dem 'Bakovac-Graben' und in der Lika-Region. Bei starker Tektonik bilden sich typischerweise Uvalas als Depressionsformen, die wesentlich größer als Dolinen sind. Sie sind nicht nur durch Verkarstung, sondern ebenso durch beträchtliche Bruchtektonik geprägt. Die Brekzien weisen teilweise diagenetische, kristalline Zementierung auf. Wenn (noch) nicht total zementiert (klüftig), sind die Brekzien hochgradig wasserdurchlässig (Karst).
Date
September 2006; June 20th, 2014 (upload)
Source
see author
Author
Park Administration of National Park Northern Velebit
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Velebit breccia ("Jelar" breccia), carbonate clasts along faults and overturned folds, chaotically fractured by strong tertiar tectonics. In the Velebit they outcrop very extensively along the Adriatic coast (ca. 100km), along the WE striking‘Bakovac-graben’ and in the Lika region of the Dinarides.Joints were diagenetically cemented by fine crystalline mass. When and where the joints were not totally cemented, the matrix is highly water permeable (karst).