Osnovne litološke, biostratigrafske i geokemijske karakteristike permo-trijaske granice na području Kine i Mađarske

master's thesis

• Title: Osnovne litološke, biostratigrafske i geokemijske karakteristike permo-trijaske granice na području Kine i Mađarske : diplomski rad
• Title (english): Lithological, biostratigraphic and geochemical characteristics of the Permian–Triassic boundary in China and Hungary : master’s thesis
• Author: Nina Belas
• Mentor: Dunja Aljinović (mentor)
• Committee member: Dunja Aljinović (predsjednik povjerenstva)
• Committee member: Uroš Barudžija (član povjerenstva)
• Committee member: Ana Maričić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Mineralogy, Petrology and Mineral Resources); Zagreb
• Defense date and country: 2017-02-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Mineralogy and Petrology

Abstract

U radu su prikazane litološke, biostratigrafske i geokemijske karakteristike naslaga permo–trijaske granice (PTB) na području Kine (Meishan) i Mađarske (Bálvány–North). Podaci o ovoj granici iz literature uspoređeni su s podacima dobivenim vlastitom mikropetrološkom analizom uzorka Meishan 27. Lokalitet Meishan predstavlja GSSP za PT granicu koja je pozicionirana unutar sloja 27 u čijem sastavu dominira mikrit s malim udjelom bioklasta. Karbonatna komponenta zastupljena je kalcitom (perm) i dolomitom (trijas). U vlastitim analiziranim uzorcima utvrđena je prisutnost: 1) karbonatnog mulja, 2) bioklasta, 3) siliciklasta, 4) pirita, 5) biogenih tragova i 6) hardground površina; slično u literaturi opisanom sloju 27. Analizirani uzorci (trijas) razlikuju se od opisanog sloja 27 po dominaciji kalcita uz vrlo mali udio dolomita. Siliciklasti su zastupljeni ušiljenim zrnima kvarca čiji oblik moguće ukazuje na utjecaj vulkanizma. Lokalitet Bálvány–North predstavlja kontinuirani slijed prijelaznih naslaga smješten na području planine Bükk koje je predstavljalo dio zapadnog ruba Tethysa. U preparatima su prepoznate karakteristike: 1) stromatolitne sedimentacije – izmjena tamnih (mikritnih) i svijetlih lamina (sitni kristali kalcita i dolomita) i 2) mikrostrukture – niti, nakupine sitnih okruglih tvorbi te peloidi. Među profilima Meishan i Bálvány–North su utvrđene litološke razlike koje su posljedica taloženja u različitim okolišima. Meishan slijed odražava karakteristike taloženja na karbonatnoj padini. Među konodontnim vrstama dominiraju pelagički gondolellolidi, a mikropetrografski su identificirane kalcisfere koje ukazuju na taloženje u dubljem moru. Bálvány–North slijed odražava taloženje na središnjem dijelu karbonatne rampe. Unutar naslaga dominira konodontni rod Hindeodus dok gondolelloidi nisu pronađeni. U oba slijeda PT granica je određena prvom pojavom vrste Hindeodus parvus kako je propisano kriterijima. Uz samu PT granicu, zabilježen je pomak δ13Ccarb prema negativnim vrijednostima, na oba slijeda, stoga i ovaj kriterij može biti važan za odredbu PT granice.

Abstract (english)

Detailed lithological, biostratigraphic and geochemical characteristics of the PTB deposits in China (Meishan) and Hungary (Bálvány–North) are presented in this thesis. Available literature data was compared with data obtained by the micropetrological analysis of the thin sections and polished slab. Meishan section represents the GSSP for the PTB which is positioned within the bed 27, composed of micrite with a small amount of bioclastic component. The carbonate component is represented by calcite (Permian) and dolomite (Triassic). The analysis of the samples Meishan 27 presented by this work revealed the presence of: 1) carbonate mud, 2) bioclastic component, 3) siliciclastic component, 4) pyrite, 5) trace fossils and 6) hardground surfaces; similarly to the description of bed 27 found in literature. Analyzed samples (Triassic) differ from those described in bed 27 by the domination of calcite with small amount of dolomite. Siliciclastic component is represented by quartz grains whose form indicates the impact of volcanism. Bálvány-North section represents a continuous PTB section in the Bükk mountains, on the margin of the western Tethys. The characteristics recognized in the thin sections are: 1) stromatolite sedimentation – alterations of dark (micritic) and light laminae (calcite and dolomite) and 2) micritic elements – prostrate threads, sphere clusters and peloids. Lithological differences between the Meishan and the Bálvány-North sections stem from different depositional environments. The Meishan section reflects the characteristics of deposition on the carbonate slope. Pelagic gondolellolidi and calcispheres indicate the deposition in the deep sea environment. The Bálvány-North section reflects the characteristics of deposition in the carbonate mid-ramp environment. Conodont genus Hindeodus occurs while pelagic forms were not found. In both sections PTB is determined by the first appearance datum of the Hindeodus parvus as prescribed criteria for defining the PTB. There was a negative carbon isotope excursion along the PTB in both sections, therefore this criterion could be important for the provision of PTB.

• Keywords: Bálvány–North; Kina; Mađarska; Meishan; mikropetrografska analiza; PT granica
• Keywords (english): Bálvány–North; China; Hungary; Meishan; micropetrographic analysis; PT boundary
• Language: croatian
• URN:NBN: urn:nbn:hr:169:232691
• Study programme: Title: Geology; specializations in: Geology of mineral resources and geophysical explorations; Course: Geology of mineral resources and geophysical explorations; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra geologije (magistar/magistra geologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-03-07 09:22:14