Transgresivni slijed miocenskih naslaga u okolici Marije Bistrice

master's thesis

• Title: Transgresivni slijed miocenskih naslaga u okolici Marije Bistrice : diplomski rad
• Title (english): Transgressive sequence of Miocene deposits near Marija Bistrica : master’s thesis
• Author: Marko Repac
• Mentor: Jasenka Sremac (mentor)
• Committee member: Jasenka Sremac (predsjednik povjerenstva)
• Committee member: Davor Pavelić (član povjerenstva)
• Committee member: Dunja Aljinović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Geology and Geological Engineering); Zagreb
• Defense date and country: 2018-02-22, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Geology and Paleontology

Abstract

Na sjeveroistočnom dijelu Medvednice, na cesti koja spaja Adamovec i Mariju Bistricu, mogu se pratiti izdanci miocenskih (badenskih) naslaga. Na istraživanom dijelu ceste naslage predstavljaju jedan transgresivni ciklus, a u bazi transgresije nalaze se bazalni konglomerati. Cilj ovog rada bio je petrografski opisati konglomerate u bazi transgresije, napraviti statističku obradu pripadajućih valutica te odrediti kojem badenskom transgresivno-regresivnom ciklusu pripadaju istraživane naslage. Snimljen je geološki stup u čijoj su bazi konglomerati, na kojima slijede biogene i bioklastične karbonatne naslage te lapori i glinoviti lapori. Bazalni konglomerati opisani su kao polimiktni, s valuticama koje su dobro zaobljene, srednjeg sfericiteta, a vjerojatno su taloženi u okolišu plaže. Na temelju terenske odredbe i mjerenja napravljena je statistička obrada konglomerata na uzorku od 383 valutice. Litologija valutica je raznovrsna te su u padajućem poretku prisutne valutice iz ofiolitnog kompleksa (dijabaz i zeleni pješčenjak), crveni pješčenjak, sivi vapnenac i crni pučinski vapnenac. Raznovrsnost je opravdana pripadnim litologijama u blizini istraživane lokacije prema dostupnim geološkim kartama, te intenzivnom tektonikom na području Medvednice. Paleontološkim i mikropaleontološkim analizama lapora određena je srednjobadenska starost naslaga, odnosno NN5 zona vapnenačkog nanoplanktona. Također, brojne prisutne foraminifere vrste Orbulina suturalis potvrđuju starost NN5 zone. Zaključeno je da istraživano područje pripada drugom badenskom transgresivno-regresivnom ciklusu, koji odgovara svjetskom ciklusu morske razine TB 2.4.

Abstract (english)

Outcrops of the Miocene (Badenian) deposits are exposed on the northeast slopes of Medvednica Mt., on the road connecting Adamovec and Marija Bistrica. The outcrops represent transgressive sequence, with basal conglomerates at a base of transgressive sequence. Goals of this research were to determine lithology of conglomerate pebbles, statistically describe their size, shape and type properties, to record geological column and determine to which of the Badenian transgressive-regressive cycles investigated deposits correspond. Geological column is composed of the basal conglomerates followed by biogenic and bioclastic carbonate deposits, and marls and argillaceous marls in the upper part. Basal conglomerates are described as polymict, with well rounded, moderately spherical pebbles, deposited possibly in a beach environment. Statistical analysis was conducted in the field by measurement of 383 pebbles. Lithology of pebbles is diversified and composed of ophiolitic complex (diabases and green sandstones), red sandstones, grey limestone and black pelagic limestone. Diversity is explained by proximity of these rocks according to geological maps and complexity of surrounding terrain dueto intensive tectonic activity in the past. Micropaleontological analysis has proved previously assumed Middle Miocene (Badenian) age of samples and calcareous nannoplankton assemblage correspondence to NN5 Nanno Zone. Additionally, presence of planktic foraminifera Orbulina suturalis also corresponds to NN5 zone. It is concluded that researched deposits correspond to second (out of three) Badenian transgressive-regressive cycles, which correlates to global see level cycle TB 2.4.

• Keywords: miocen; baden; transgresija; bazalni konglomerat; Medvednica
• Keywords (english): Miocene; Badenian; transgression; basal conglomerates; Medvednica Mt.
• Language: croatian
• URN:NBN: urn:nbn:hr:169:613536
• 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: 2018-07-20 11:10:27