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Title:Sedimentological and paleontological analysis of the Lower Jurassic part of the Zatrnik Formation on the Pokljuka plateau, Slovenia
Authors:ID Gale, Luka (Author)
ID Kukoč, Duje (Author)
ID Rožič, Boštjan (Author)
ID Vidervol, Anja (Author)
Files:.pdf PDF - Presentation file, download (11,45 MB)
MD5: 44102FCF2F9501F361474BF8CF157405
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo GeoZS - Geological Survey of Slovenia
Abstract:The uppermost Ladinian to Lower Jurassic Zatrnik Formation is the lithostratigraphic unit of the Mesozoic deeper marine Bled Basin. The uppermost part of the Zatrnik Formation and the transition into the overlying Ribnica Breccia was logged at the Zajamniki mountain pasture on the Pokljuka mountain plateau in the Julian Alps. The lowermost part the section belongs to the “classical” Zatrnik Formation and is dominated by beige micritic limestone and fine-grained calcarenite. Foraminifers Siphovalvulina, ?Everticyclammina, ?Mesoendothyra and ?Pseudopfenderina are present, indicating Early Jurassic age. The beige limestone is followed by light pink limestone of the uppermost Zatrnik Formation. Slumps are common in this interval, and crinoids are abundant. Alongside some species already present in beds lower in the succession, Meandrovoluta asiagoensis Fugagnoli & Rettori, Trocholina sp., Valvulinidae, small Textulariidae, Lagenida, and small ?Ophthalmidium alsooccur in this interval. Resedimented limestone predominates through the studied part of the Zatrnik Formation, indicating deposition on the slope or at the foot of the slope of the basin. The switch to crinoid-rich facies within the slumped interval of the Zatrnik Formation may reflect accelerated subsidence of the margins of the Julian Carbonate Platform in the Pliensbachian. The Zatrnik Formation is followed by the formation of the Pliensbachian (?) Ribnica Breccia. Impregnations of ferromanganese oxides, violet colour, and an increase in clay content are characteristic. The foraminiferal assemblage consists of Lenticulina, small elongated Lagenida, and epistominids. Individual beds of the Ribnica Breccia were deposited via debris flows. Enrichments in ferromanganese oxides point to slower sedimentation.
Keywords:Lower Jurassic, Bled Basin, Pokljuka Nappe, stratigraphy, foraminifer, Hierlatz facies, Ribnica Breccia, Zajamniki
Publication status:Published
Publication version:Version of Record
Publisher:Geološki zavod Slovenije
Year of publishing:2021
Number of pages:str. 173-188
Numbering:vol. 64, no. 2
PID:20.500.12556/DiRROS-14795 New window
UDC:551.7
ISSN on article:0016-7789
DOI:10.5474/geologija.2021.010 New window
COBISS.SI-ID:92473603 New window
Publication date in DiRROS:09.03.2022
Views:652
Downloads:279
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Record is a part of a journal

Title:Geologija
Publisher:Geološki zavod Slovenije
ISSN:0016-7789

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:28.12.2021

Secondary language

Language:Slovenian
Title:Sedimentološka in paleontološka analiza spodnjejurskega dela Zatrniške formacije na Pokljuki, Slovenija
Abstract:Zgornjeladinijska do spodnjejurska Zatrniška formacija je značilna litostratigrafska enota mezozojskega Blejskega bazena. Zgornji del Zatrniške formacije in prehod v mlajšo Ribniško brečo smo posneli na planini Zajamniki na Pokljuki. Najnižji del posnetega zaporedja pripada “klasičnemu” delu Zatrniške formacije. Najpogostejši litologiji v tem delu sta mikritni apnenec bež barve in drobnozrnat kalkarenit. Določene so bile foraminifere Siphovalvulina, ?Everticyclammina, ?Mesoendothyra in ?Pseudopfenderina, ki dokazujejo zgodnjejursko starost. “Klasičnemu” delu Zatrniške formacije sledi svetlo rožnat apnenec, ki še vedno pripada Zatrniški formaciji. Za ta interval so značilne strukture podvodnega plazenja. Pogosti, v nekaterih plasteh prevladujoči, so delci morskih lilij. Poleg že prej omenjenih rodov foraminifer, so tukaj prisotne še Meandrovoluta asiagoensis Fugagnoli & Rettori, Trocholina sp., Valvulinidae, drobne Textulariidae, Lagenida, in drobni ?Ophthalmidium. Resedimenti, ki prevladujejo v obeh posnetih delih Zatrniške formacije, kažejo na sedimentacijo na pobočju ali ob vznožju pobočja. Prehod v rožnat apnenec s pogostimi sledovi plazenja in obilico ploščic morskih lilij bi lahko odražal pospešeno pogrezanje robov Julijske karbonatne platforme v pliensbachiju. Zatrniški formaciji sledi formacija pliensbachijske (?) Ribniške breče. Značilne so impregnacije z železovo-manganovimi oksidi, vijolična barva kamnine in večja količina glinene primesi. Foraminiferno združbo sestavljajo Lenticulina, drobne razpotegnjene Lagenida in epistominide. Plasti Ribničke breče so bile odložene z drobirskimi tokovi. Obogatitve z železovo-manganovimi oksidi kažejo na počasnejšo sedimentacijo.
Keywords:spodnja jura, Blejski bazen, Pokljuški pokrov, stratigrafija, foraminifera, hierlaški facies, Ribniška breča, Zajamniki


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