Facijesne i biostratigrafske karakteristike krednih naslaga okolice Gackog, Bosna i Hercegovina

master's thesis

• Title (english): Facies and biostratigraphy of Cretaceous deposits from Gacko area, Bosnia and Herzegovina
• Author: Robert Šamarija
• Mentor: Alan Moro (mentor)
• Mentor: Borna Lužar-Oberiter (komentor)
• Committee member: Alan Moro (predsjednik povjerenstva)
• Committee member: Borna Lužar-Oberiter (član povjerenstva)
• Committee member: Dražen Kurtanjek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2023-07-10, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology

Abstract

Cilj ovog diplomskog rada bila je mikrofacijesna i mikropaleontološka analiza krednih naslaga sjeveroistočno od Gackog, Bosna i Hercegovina. Unutar donjokrednih naslaga određena su 3 mikrofacijesa koji odgovaraju facijesnim zonama zaštićene unutarnje platforme i otvorene platforme. Starost ovih naslaga određena je kao barem–apt na temelju biostratigrafskog raspona bentičke foraminifere Palorbitolina sp. Unutar baremsko–aptskih naslaga zastupljeni su ekstraklasti koji upućuju na trošenje paleokopnenih područja s vapnencima donjojurske starosti. Između donjokrednih i gornjokrednih naslaga utvrđena je transgresivna granica. Unutar gornjokrednih naslaga određena su 3 mikrofacijesa koji odgovaraju rasponu facijesnih zona od otvorene platforme preko padine do podnožja padine. Mala debljina plitkomorskih gornjokrednih naslaga koje prelaze u pelagičke vapnence padine ukazuje na relativno brzu transgresiju s tektonskim utjecajem. Starost gornjokrednih naslaga je santon–donji kampan, utvrđena na temelju biostratigrafskih raspona određenih pelagičkih foraminifera. Unutar santonsko– donjokampanskih naslaga zastupljeni su ekstraklasti koji su rezultat trošenja paleokopna te intraklasti koji upućuju na pretaloživanje unutar taložnog prostora.

Abstract (english)

This thesis focuses on the microfacies and biostratigraphic analysis of Cretaceous deposits northwest of Gacko, Bosnia and Herzegovina. Within the lower Cretaceous deposits 3 microfacies types were determined, which correspond to restricted and open marine facies zones. The age of the lower Cretaceous deposits is determined as Barremian–Aptian, based on the benthic foraminifera Palorbitolina sp. Extraclasts within the Barremian–Aptian deposits indicate the existence of contemporaneous land areas from which lower Jurassic limestones were being eroded. Lower Cretaceous deposits are unconformably overlain by upper Cretaceous deposits, the age of which has been determined as Santonian–lower Campanian, based on the biostratigraphic ranges of identified planktonic foraminifera. Within the upper Cretaceous deposits 3 microfacies types were determined, which correspond to facies zones ranging from open marine, slope to toe–of–slope. The small thickness of upper Cretaceous shallow–water deposits which pass vertically into pelagic limestones indicates that the transgression was relatively rapid and tectonically controlled. Within the Santonian–lower Campanian deposits, extraclasts of older limestones were identified, as well as intraclasts which point to re–sedimentation processes within the depositional environment.

• Keywords: kreda; Gacko; biostratigrafija; plitkomorski vapnenci; pelagički vapnenci; planktonske foraminifere
• Keywords (english): Cretaceous; Gacko; biostratigraphy; shallow–water limestones; pelagic limestones; planktonic foraminifera
• Language: croatian
• URN:NBN: urn:nbn:hr:217:193243
• Study programme: Title: Geology; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni magistar/magistra geologije (sveučilišni magistar/magistra geologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2025-07-11
• Created on: 2025-01-31 10:25:10