Paleoekologija malih bentičkih foraminifera iz badenskih naslaga lokaliteta Donje Orešje (Medvednica)

master's thesis

• Title (english): Paleoecology of small benthic foraminifera from badenian sediments of Donje Orešje ( Medvednica Mt.)
• Author: Ivana Babić
• Mentor: Đurđica Pezelj (mentor)
• Committee member: Đurđica Pezelj (predsjednik povjerenstva)
• Committee member: Vlasta Ćosović (član povjerenstva)
• Committee member: Marijan Kovačić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2018-02-21, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Geology and Paleontology

Abstract

Uzorci lapora sa lokaliteta Donje Orešje obrađeni su metodom šlemanja, te je napravljena paleoekološka rekonstrukcija okoliša na osnovu bentičkih foraminifera. Ukupno su određena 24 roda i 33 vrste bentičkih foraminifera. Određena je gornjo badenska starost naslaga, što odgovara Bulimina-Bolivina zoni badena Centralnog Paratethysa.
Za određivanje paleodubine okoliša korištene su 3 metode: odnos plankton/bentos, metoda dubinskih raspona bentičkih foraminifera, te modificirani odnos plankton/bentos. Izračunate dubine ukazuju na oscilacije u paleodubini duž profila. U donje i srednjem dijelu stupa dubia taloženja odgovara području od unutrašnjeg do srednjeg šelfa, dok u gornjem dijelu dolazi do produbljavanja na područje od srednjeg šelfa do gornjeg batijala. Duž profila raznolikost foraminiferske zajednice opada, uz porast dominacije, dok vrijednosti indeksa kisika bentičkih foraminifera (BFOI) ukazuju da su na morskome dnu bili prisutni srednje oksični uvjeti.

Abstract (english)

Sediment simples were taken at locality Donje Orešje and processed method of wet sieving. Palaeoenvironmental reconstruction has been made primarily by benthic foraminifera. A total of 24 genus and 33 species of benthic foraminifera were determined. Upper Badenian Bulimina-Bolivina Zone was recognized on the basis of overlapping stratigraphic ranges of benthic foraminifera.
Depositional depth was estimated by means of three metods: plankton/benthos ratio, analysis of depth of benthic foraminifera and modified plankton/benthos ratio. Calculated paleodepths point to sea level oscillations along the studied profile. In the lower and middle part of the profile inner-middle shelf environment is determined, while in the upper part of profile deepening of depositional basin is evident (middle shelf-bathyal environment). Diversity of benthic foraminiferal assemblages decreases, while domination increases upward the profile. Calculated Beenthic Foraminiferal Oxygen Index (BFOI) indicated medium oxic conditions on the sea floor.

• Keywords: bentičke foraminifere; baden; paleoekologija; Donje Orešje
• Keywords (english): benthic foraminifera; badenian; paleoecology; Donje Orešje
• Language: croatian
• URN:NBN: urn:nbn:hr:217:895854
• Study programme: Title: Graduate university study of Geology; 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: 2018-03-05 13:20:41