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Vpliv globalnih sprememb na variabilnost izotopske sestave kisika in ogljika na prehodu iz perma v trias v dolini Idrijce : diplomsko deloDolenec, Matej, 1974-Namen raziskav moje diplomske naloge je bil podrobneje preučiti vzroke variabilnosti izotopskih parametrov delta ▫$^18O$▫, delta ▫$^13C_karb.$▫, delta ▫$^13C_org.$▫ in "sprememba" delta ... ▫$^13C_karb.-org.$▫ ter njihove anomalije v mejni karbonatni sekvenci na prehodu iz perma v trias v dolini Idrijce in s pomočjo podatkov o magnetni susceptibilnosti, časovno opredeliti trajanje globalnih dogodkov, ki so povzročili izotopske anomalije v raziskanemprofilu. V ta namen je bilo detajlno po centimetrih vzorčevana 55 cm debela permsko-triasna mejna sekvenca v dolini Idrijce, kjer je profil odlično razgaljen. Rezultati mikroskopskih raziskav so pokazali, da je na raziskanem območju P/Tr, meja podobno kot v Alpah, vezana za Tesero horizont z ooliti, ki pa je v dolini Idrijce dokaj slabo razvit. Njegova debelina namreč doseže le nekaj deset centimetrov. V njem leži do 0.8 cm debela glinasto-laporna PTB plast, ki označuje P/Tr mejo in vsebuje zanjo značilen pik magnetne susceptibilnosti ter magnetitne sferule. Z analizo izotopske sestave ogljika v apnencih in ogljika v sedimetirani organski snovi smo ugotovili več izotopskih anomalij, za katere predpostavljamo, da so posledica znanih globalnih sprememb v ogljikovem ciklusu na prehodu iz perma v trias. Prva večja nihanja izotopske sestave ogljika v raziskanem delu profila so se začela približno 400 tisoč let pred koncem perma. Najverjetneje so posledica različnih dejavnikov, kot so zaključna faza zgornjepermske regresije, dotok anoksične morske vode v priobalna področja, vulkanska dejavnost in klimatske spremembe. Postopno zvečanje parametra "sprememba" delta ▫$^13C_karb.-org.$▫ v vrhnjih 26 cm zgornjepermskega apnenca (to je v zadnjih 380 tisoč letih), sovpada s postopnim zmanjševanjem fosilnega inventarja in njegovim popolnim izginotjem na sami meji, ter z drastičnim zmanjšanjem hitrosti sedimetacije (od približno 32 cm na 5 cm v sto tisoč letih). Hitro zmanjšanje vrednosti "sprememba" delta ▫$^13C_karb.-org.$▫ tik nad P/Tr mejo (to je v intervalu od 0 do 3 cm - v časovnem razponu 10 tisoč let) kaže na hitro vzpostavitev ugodnih pogojev za bohoten razvoj planktona v spodnjetriasnem morju, ki je sledil porušitvi ekosistema ob koncu perma.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [M. Dolenec], 2000Language - slovenianCOBISS.SI-ID - 225118
Author
Dolenec, Matej, 1974-
Other authors
Ogorelec, Bojan
Topics
izotopi |
kisik |
ogljik |
perm |
trias |
paleoklima |
Idrijca |
isotopes |
oxygen |
carbon |
permian |
triassic |
paleoclimate |
river Idrijca
Library | Call number – location, accession no. ... | Copy status |
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NTF, Department of Geology, Lj. | Geologija M DOLENEC Matej Vpliv globalnih IN: 000012913 |
available - outside loan, loan period: 14 days |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Dolenec, Matej, 1974- | 21372 |
Ogorelec, Bojan | 01404 |
Source: Personal bibliographies
and: SICRIS
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