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Sedimentološka analiza črnih ladinijskih apnencev na območju Idrije
Mušič, Maša (Author), Gale, Luka (Mentor) More about this mentor... This link opens in a new window, Čar, Jože (Co-mentor)

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Abstract
Za raziskovalno nalogo sta bila preučena dva litološka profila večinoma tanko- do srednjeplastnatih črnih apnencev, ki nastopajo v krovni strukturi Idrijskega rudišča. Formacija do sedaj sedimentološko še ni bila natančno preučena, zato sem iz nabranih vzorcev izdelala zbruske in opravila podrobnejšo mikrofacielno analizo. Za določitev starosti formacije sem odvzela več vzorcev za konodontne analize. Prvi od posnetih profilov se nahaja nad pokopališčem (Skrnik), drugi pa ob sprehajalni poti na Rakah. V zaporedju prevladujejo tanko do srednje plastnati mikritni apnenci, ki so redko vzporedno ali navzkrižno laminirani. Mikritni apnenec zajema več mikrofaciesnih različkov: laminirani mudstone z redkimi radiolariji, radiolarijsko-filamentni wackstone in filamentno-peloidni packstone. Mikritne apnence prekinjajo srednje debele plasti školjčnih kalkarenitov in zelo debele plasti apnenčevih breč. Te se mikrofaciesno odražajo kot delno izprani packstone, floatstone s peloidnim vezivom in intraklastično-školjčni floatstone-rudstone. V njih so v večini prisotni fragmenti školjčnih lupin in intraklasti, ki plavajo v peloidni osnovi. Mikrofaciesna združba kaže na odlaganje na pobočju ali vznožju globljemorskega bazena. Hemipelagično sedimentacijo so prekinjali distalni turbiditni tokovi in drobirski tokovi. Oboji so v bazensko okolje prinesli tudi plitvomorske klaste. Najdba konodonta vrste Pseudofurnishius murcianus Van den Boogaard formacijo uvršča v zgornji ladinij.

Language:Slovenian
Keywords:Zunanji Dinaridi, Trnovski pokrov, Idrija, zgornji ladinij, mikrofacies, sedimentološki profil, konodonti, črni apnenci
Work type:Final paper (mb12)
Organization:NTF - Faculty of Natural Sciences and Engineering
Year:2020
COBISS.SI-ID:31706627 This link opens in a new window
Views:292
Downloads:141
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Secondary language

Language:English
Title:Sedimentological analysis of black Ladinian limestone from the area of Idrija
Abstract:
The presented research deals with sedimentological analysis of black thin- to medium-bedded limestone that forms the uppermost part of the Idrija mine structure. The formation was logged in two sections: the first section is located above the Idrija cemetery (Skrnik), while the second section lies close to the Rake promenade. From the collected samples, thin sections were made to determine the microfacies association. Conodont analysis was made for age determination. The succession consists mainly of thin- to medium-bedded micritic limestone, which is locally parallel and cross-laminated. Micritic limestone includes several microfacies types: laminated mudstone with rare radiolarians, radiolarian-fillament wackstone and filament-peloid packstone. Intercalated between micritic limestone are medium-bedded calcarenites with mollusks and limestone breccia. These two facies types include the following microfacies types: poorly washed packstone, floatstone with peloid-rich matrix and intraclastic-mollusc floatstone-rudstone. Facies association points to sedimentation on the slope or at the foot of the slope in a deep-sea basin. Hemipelagic sedimentatiton was interrupted by distal calciturbidites and debris flows. They both transported shallow-water material into the basinal environment. The finding of a conodont species Pseudofurnishius murcianus Van den Boogaard suggests upper Ladinian age of the formation.

Keywords:External Dinarides, Trnovo nappe, Idrija, upper Ladinian, microfacies, sedimenological profile, conodonts, black limestones

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