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master's thesis
Mineraloške, petrološke i geokemijske značajke boksita iz ležišta "Minjera" kod Buzeta
diplomski rad
Zagreb: University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, 2019. urn:nbn:hr:169:053492
Petohleb, Lea
University of Zagreb
Faculty of Mining, Geology and Petroleum Engineering
Department of Mineralogy, Petrology and Mineral Resources

Institutional repository: Faculty of Mining, Geology and Petroleum Engineering Repository, University of Zagreb

Cite this document

Petohleb, L. (2019). Mineraloške, petrološke i geokemijske značajke boksita iz ležišta "Minjera" kod Buzeta : diplomski rad (Master's thesis). Zagreb: University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering. Retrieved from https://urn.nsk.hr/urn:nbn:hr:169:053492

Petohleb, Lea. "Mineraloške, petrološke i geokemijske značajke boksita iz ležišta "Minjera" kod Buzeta : diplomski rad." Master's thesis, University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, 2019. https://urn.nsk.hr/urn:nbn:hr:169:053492

Petohleb, Lea. "Mineraloške, petrološke i geokemijske značajke boksita iz ležišta "Minjera" kod Buzeta : diplomski rad." Master's thesis, University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, 2019. https://urn.nsk.hr/urn:nbn:hr:169:053492

Petohleb, L. (2019). 'Mineraloške, petrološke i geokemijske značajke boksita iz ležišta "Minjera" kod Buzeta : diplomski rad', Master's thesis, University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, accessed 31 July 2024, https://urn.nsk.hr/urn:nbn:hr:169:053492

Petohleb L. Mineraloške, petrološke i geokemijske značajke boksita iz ležišta "Minjera" kod Buzeta : diplomski rad [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering; 2019 [cited 2024 July 31] Available at: https://urn.nsk.hr/urn:nbn:hr:169:053492

L. Petohleb, "Mineraloške, petrološke i geokemijske značajke boksita iz ležišta "Minjera" kod Buzeta : diplomski rad", Master's thesis, University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Zagreb, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:169:053492

Metadata
TitleMineraloške, petrološke i geokemijske značajke boksita iz ležišta "Minjera" kod Buzeta : diplomski rad
Title (english)Mineralogical, petrological and geochemical characteristics of bauxites from "Minjera" deposit near Buzet : master's thesis
AuthorLea Petohleb
MentorUroš Barudžija (mentor)
Committee memberUroš Barudžija (predsjednik povjerenstva)
Committee memberGoran Durn (član povjerenstva)
Committee memberMarta Mileusnić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mining, Geology and Petroleum Engineering
(Department of Mineralogy, Petrology and Mineral Resources)
Zagreb
Defense date and country2019-10-18, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mining, Petroleum and Geology Engineering
Geological Engineering
Abstract
Ovim radom istraživane su mineraloške, petrološke i geokemijske značajke boksita iz ležišta „Minjera“ kod Buzeta u Istri. Semikvantitativni mineralni sastav 8 uzoraka sivih boksita, uzorkovanih duž profila ležišta, određen je metodom rendgenske difrakcije na prahu (XRD). Petrološke karakteristike 11 uzoraka vapnenaca iz podine, krovine te crnog boksita u krovini ležišta određene su metodom polarizacijske mikroskopije. Spektrometrijskim metodama (ICP-AES, ICP-MS, XRF) određen je kemijski sastav analiziranih uzoraka. Podinu boksita čine naslage cenomanskih rudistnih vapnenaca, a u krovini im se nalaze paleocenski slatkovodno-brakični vapnenci s gastropodima i ostacima bilja. Crni boksit iz vršnog dijela boksita, sadrži boksitične piritizirane ooide. U uzorcima sivih boksita iz profila određeni su sljedeći minerali: dijaspor, böhmit, kaolinit, pirit, rutil, anatas, gips i goethit. Pojedini uzorci sadrže mješanoslojne/nepravilno interstratificirane minerale (moguće illit-smektit) i 14Å minerale (vermikulit i/ili smektit). Kemijskom analizom određeno je da SO3 i Fe2O3, nemaju jednoliku raspodjelu duž profila, što ukazuje na fluktuaciju vodnog lica tijekom procesa nastajanja boksita. Obogaćenje REE i povećanje udjela Al2O3 prema podini ležišta ukazuju na „in-situ“ boksitizaciju.
Abstract (english)
Mineralogical, petrological and geochemical characteristics of bauxites from deposit „Minjera“, located near Buzet in Istria, were investigated. Semiquantitative mineral composition from 8 samples of grey bauxites, which are sampled in the profile within the deposit, is determined by XRD. Petrological characteristics of limestones in the footwall and hangingwall of bauxite deposit were determined from 11 samples by polarising microscopy. Microscopical investigations also included one sample of black bauxites from the top of the sampled profile, near the hangingwall limestones. Chemical composition of bauxites is determined by various spectrometric methods (ICP-AES, ICP-MS, XRF). Footwall of bauxites are rudist limestones of Cenomanian age, and in the hangingwall of bauxite deposit Paleocene freshwater to brackish limestones with gastropods and plant remains appear. Black bauxite from the top of the profile contains bauxitic pyritized ooids. In the samples of grey bauxites following minerals are determined: diaspore, böhmit, kaolinite, pyrite, rutile, anatase, gypsum and goethit. Some samples contain mixed-layer/irregularly interstratified minerals (possibly illite-smectite) and 14Å minerals (vermiculite and/or smectite). The trends of distribution SO3 and Fe2O3 along the profile can’t be clearly distinguished from the results of the chemical analyses, which implies the fluctuation of water levels during the process of bauxitization. Enrichment in REE and increased Al2O3 toward the footwall of the deposit implies an “in-situ” bauxitization.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:169:053492
Study programmeTitle: Geological engineering; specializations in: Hydrogeology and engineering geology, Environmental geology
Course: Environmental geology
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka geološkog inženjerstva (magistar/magistra inženjer/inženjerka geološkog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2022-01-31 14:22:27