Postsedimentne dolomitizacijske brece u jurskim plitkomorskim karbonatnim sedimentima Malog Alana na juznom velebitu

Thin layers of ooid grainstones and/or thin layers and intercalation of tempestite breccias are very frequent as a rhythmic sedimentation members in the shallow-marine, prevailing lagoonal, mudstone/wackestone Dogger limestones. Such a sedimentation is a consequence of carbonate mud deposition in la...

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Bibliographic Details
Published in:Rudarsko-geološko-naftni zbornik 1990-12, Vol.2 (1), p.59-65
Main Author: TISLJAR, J
Format: Article
Language:hrv ; eng
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
jurski plit-komorski karbonati Velebita
kasnodijagenetska dolomitizacija
Mountains
Petrology of sedimentary rocks except quaternary rocks
Postsedimenrary dolomitization breccia: Jurassic shallowmarine carbonates of the Velebit Mt
Postsedimentne dolomitizacijske breče
rhythmic peritidal sedimentation
ritmička peritidalna sedimentacija
Sedimentary geology
Sedimentary rocks
Sedimentation & deposition
tempestites: late-digenetic dolomitization
tempestiti
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Summary:Thin layers of ooid grainstones and/or thin layers and intercalation of tempestite breccias are very frequent as a rhythmic sedimentation members in the shallow-marine, prevailing lagoonal, mudstone/wackestone Dogger limestones. Such a sedimentation is a consequence of carbonate mud deposition in lagoons and restricted shallows and temporary flooding and deposition of ooid sand and/or coarser detritus by enhanced water energy, i.e. stormy waves. The shallow-marine limestones in the Lower and Middle Dogger comprise zones of carbonate breccias thick several to tens meter, consisting of darkgray »fragments« of mudstone and wackestone and dolomite »cement«. This postsedimenrary dolomitization breccias are definitely not synsedimentary formation, and became by incomplete late-diagenetic dolomitization of previously tectonized, fractured and crashed Dogger limestones. Their misinterpretation by a synsedimentary process. especially as a intraformational breccia type, sined they appeared confomably stratified in the Dogger limestone, may lead to serious mistakes in interpretation of paleomorphology of carbonate platform and erroneous reconstruction of sedimentary environment and depositional conditions for the Dogger limestones. [PUBLICATION ABSTRACT]
ISSN:0353-4529
1849-0409