20.500.12556/RUL-154149 Večmetodne raziskave potencialnih stratigrafskih vrzeli v zgornjekrednem karbonatnem zaporedju jugozahodnega krila Postojnske antiklinale magistrsko delo Multi-method studies of potential stratigraphic gaps in Upper Cretaceous carbonate succession of SW limb of Postojna anticline master's thesis IZVLEČEK V pozni kredi in paleogenu sta dve dolgotrajni kraški obdobji prekinili razmeroma kontinuirano pretežno plitvomorsko sedimentacijo severnega dela Jadranske karbonatne platforme (JKP). Mlajši, t.i. kredno paleogenski paleokras, ločuje valanginijsko-hauterivijske do campanijske plitvomorske karbonate notranjih delov JKP od maastrichtijskih do eocenskih palustrinih, periplimskih in plitvomorskih karbonatov sinorogene karbonatne platforme. Razpon stratigrafske vrzeli se povečuje od SV proti JZ, kopnemu pa so bili izpostavljeni predvsem notranji deli platforme. Po drugi strani pa med kredno paleogenskim paleokraškim obdobjem nad morsko gladino niso bili dvignjeni nekateri predeli SV obrobja platforme temveč so bili ti že v zgornji kredi postopoma potopljeni v globlje morje, ki so tako tvorili sprva blago pobočje proti predgorskemu bazenu. Namen pričujoče naloge je bil, da posnamem zaporedje karbonatnih kamnin JKP na območju Postojne ter na podlagi faciesnih zaporedij in diagenetske zgodovine potrdim ali ovržem hipotezo o obstoju obeh erozijsko-diskordantnih površin. Na začetku profila P1 rudistni apnenci predstavljajo Lipiško formacijo, ki jim sledijo mikritni apnenci Liburnijske formacije z več haracejami in diskorbidami. Sledi sedimentacija v brakičnem okolju v bližini kopnega z močnim vplivom meteorne vode, ki se kaže v številnem drobirju mikrokodijskih zrn, globul, fenestralni poroznosti in rizolitih (drugi segment). Tretji segment profila predstavlja apnenčeva breča, ki se je odlagala v plitvomorskem okolju z odprto povezavo z globljim morjem, kar potrjujejo tudi izotopske in elementne analize, katodoluminiscenca pa je pokazala bolj redukcijske pogoje diageneze. Čeprav apnenci raziskanega profila v najvišjem delu krede (maastrichtiju) kažejo nedvoumne znake pedogenih predelav in prisotnosti meteorne vode, tako v sedimentacijskem, kot diagenetskem okolju, pa daljših paleokraških vrzeli v karbonatnem zaporedju nismo uspeli dokazati. In the Late Cretaceous and Paleogene, two prolonged karst periodes interrupted the relatively continuous, predominantly shallow-marine sedimentation of the northern part of the Adriatic Carbonate Platform (AdCP). The younger, Cretaceous-Paleogene paleokarts, separates the Valanginian-Hauterivian to Campanian shallow-marine carbonates of the inner parts of the AdCP from the Maastrichtian to Eocene palustrine, periplatform and shallow-marine carbonates of the synorogenic carbonate platform. The stratigraphic gap widens from the northeast to the southwest, with mailny the inner parts of the platform exposed to the land. On the other hand, during the Cretaceous-Paleogene peroid, some areas of the northeastern margin of the platform were not uplifted above sea level; instead, they were gradually submerged into deeper seas, forming a gentle slope towards the foreland basin in the Late Cretaceous. The aim of this study was to document the sequence of carbonate rocks of the AdCP in the Postojna region and based on facies of carbonate rocks and diagenetic history, confirm of disprove the hypothesis of the existence of two erosion-discordant surfaces. At the beginning of profil P1, rudist limestones represent the Lipica formation, followed by micritic limestones of the Liburnia formation with numerous haracean algae and discorbids. Follows the sedimentation in the brackish enviroment near the land with a stong influence of meteoric water, evidenced by the abundant debris of microcodium grains, globules, fenestral porosity and rhizolites. The last segment of the profile represents limestone breccia, deposited in a shallow-marine anviroment with an open connection to deeper seas, as comfirmed by isotopis and elemental analyses. Chatodoliminiscence revealed more reducing contidions of diagenesis. Although the limestone of the studied profile in the upper part of the Cretaceous (Maastrichtian) show unequivocal signs of pedogenic alteration ant the presence of meteoric water in both sedimentary and diagenetic enviroments, we could not prove the existance of longer paleokarstic gaps in carbonate sequence. zgornja kreda izotopska analiza paleokras katodoluminiscenca rentgenska spektroskopija (XRF) Liburnijska formacija Rhapydionina liburnica Upper Cretaceous paleokarst cathodoluminiscence (XRF) isotopes Liburnian formation Rhapydionina liburnica true false false A. Uršič Arko Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-01-27 09:00:05 2024-01-27 09:00:27 2024-02-21 09:59:26 0000-00-00 00:00:00 2024 0 Ljubljana 0 Ljubljana XIII, 61 f., pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 55 98065 186273283 19942.pdf 19942.pdf 1 CF6040E6DF2FEDC0552AE80B04F04B1C 1ed63b3cb0a7cc805f0cca0cb9d9b9d37b4023b0389ee0aba9bb36e25a05c4d8 23e6e9c1-bcea-11ee-a401-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180353 19943.pdf 19943.pdf 1 DED513575C3755F5BC79ACE0186B9534 800cd8c83dc49cd24676173d9c0e0672bfa3ebb6422253d5c8b64ecc277df364 23e7dae1-bcea-11ee-a401-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180354 19944.pdf 19944.pdf 1 CFAC96296F24F5CBE1CF94BE0394744D caef9456f9b5523c7de5897c612c6ef7cae26eb2b8b907a1a59a2f614efccbdc 23e81a11-bcea-11ee-a401-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180355 19945.pdf 19945.pdf 1 910D36B99193DF013F226378FDFC8ECF 1abc0d05db68684a5baedc37a6b4b03d91fbf1bbfbcebfc3faec27b5646af371 23e84c93-bcea-11ee-a401-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180356 Naravoslovnotehniška fakulteta 0 0 0