Sarmatski paleookoliši lokaliteta Vranović (kamenolom Našicecement) na osnovu foraminifera

master's thesis

• Title (english): Sarmatian paleoenvironments of the Vranović area (quarry Našicecement) based on foraminifera
• Author: Ana Marija Trogrlić
• 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); (Division of Geology and Paleontology); Zagreb
• Defense date and country: 2018-02-21, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Geology and Paleontology

Abstract

Profil Vranović smješten je unutar kamenoloma Našicecement, na sjeverozapadnom dijelu planine Krndija. Tijekom miocena on je pripadao prostoru Centralnog Paratethysa. Uzorci su obrađeni metodom šlemanja, a zatim mikroskopski analizirani. Mikrofosilna zajednica je detaljno proučena, te su određene vrste bentičkih foraminifera. Na osnovu stratigrafskih raspona prisutnih vrsta određena je starost naslaga kao sarmat. Određen je udio planktonskih i bentičkih foraminifera, izražunati su indeksi raznolikosti, indeks kisika bentičkih foraminifera (BFOI), te je izračunat salinitet transfer metodom za salinitet. Izdvojene su dvije zajednice bentičkih foraminifera, a to su Elphidium zajednica tipična za uzorke iz svijetlih lamina lapora, te Bolivina zajednica tipična za uzorak tamne lamine lapora. Elphidium zajednica karakteristična je za plitkovodni okoliš, određeni su visoko oksični uvjeti i hipersalini okoliš. U Bolivina zajednici uz znatan pad broja vrsta, dolazi do smanjenja oksičnosti i porasta broja infaune, a vrijednost saliniteta je prema transfer funkciji smanjena te ukazuje na normalan marinski okoliš.

Abstract (english)

Vranović section is situated in Našicecement quarry, on the NW part of Mt. Krndija. During the Miocene, this locality was part of Central Paratethys Sea. Samples were soaked, treated with hydrogen peroxide and washed over 0,063 mm sieve and then micropalaeontologically analysed. Microfossil assemlages were studied and benthic foraminifera species were identified. Stratigrafhic ranges of benthic foraminiferal species indicate age of deposits as Sarmatian. Plankton/benthos (P/B) ratio, diversity indices, Benthic Foraminiferal Oxygen Index (BFOI) and salinity were calculated. Two different assemblages of benthic foraminifera were determinated; Elphidium assemblage in light marl laminae and Bolivina assemblage in dark marl lamina. Elphidium assemblages indicate shallow marine and high-oxic environment. Also, salinity value calculated by transfer function indicates hypersaline conditions. In Bolivina assemblage number of species decreases, oxic conditions are lower and salinity indicates normal marine environment.

• Keywords: Bentičke foraminifere; Centralni Paratethys; sarmat; Vranović
• Keywords (english): Benthic foraminifera; Central Paratethys; Sarmatian; Vranović
• Language: croatian
• URN:NBN: urn:nbn:hr:217:283928
• 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: 2018-03-01 10:27:01