Stvaranje aragonita u vodenom sustavu Mljetskih jezera

master's thesis

• Title: Stvaranje aragonita u vodenom sustavu Mljetskih jezera : diplomski rad
• Title (english): Formation of aragonite in aqueous system of Mljet Lakes : master's thesis
• Author: Mirjana Sekušak
• Mentor: Ivan Sondi (mentor)
• Committee member: Ivan Sondi
• Committee member: Goran Durn
• Committee member: Marta Mileusnić
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Mineralogy, Petrology and Mineral Resources); Zagreb
• Defense date and country: 2014-02-14, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Mineralogy and Petrology

Abstract

U ovom radu istražene su mineraloške, strukturne i morfološke značajke mineralnih čestica koje su
izdvojene iz suspendiranog materijala tijekom pojave koloidnog bijelila, mliječno bijele suspenzije,
u poluzatvorenom, krškom morskom jezeru na otoku Mljetu (Jadransko More). Čestice su
analizirane metodom rendgenske difrakcije (XRD), pretražnim elektronskim mikroskopom s
visokim razlučivanjem (FE-SEM) te metodom laserske difrakcije (LD). Rezultati su pokazali da su
igličaste čestice dominantna mineralna faza u suspendiranom materijalu tijekom pojave bijelila,
dok je analiza rendgenske difrakcije tih čestica potvrdila prisutnost aragonita. Granulometrijske
karakteristike, morfološke značajke i strukturne pojedinosti igličastih čestica aragonita potvrdile su
značaj novog modela kristalizacije, odnosno koncepta mezokristalnog rasta u njihovom nastajanju.
Osim toga, ovo istraživanje dokazuje ulogu biološki potaknute anorganske precipitacije na nanorazini
u formiranju aragonita u ograničenom mediteranskom okolišu.

Abstract (english)

Abstract: This study examines mineralogical, structural and morphological characteristics of mineral
particles originating from suspended matter during the formation of whiting events, drifting milky
clouds of water, in a semi-enclosed, karstic, marine lake on the island of Mljet (Adriatic Sea). The
particles were examined by X-ray diffraction (XRD), field emission scanning electron microscopy
(FE-SEM), as well as laser diffraction (LD). The results have shown that the needle-like particles
were the dominant mineral phase in suspended matter from whiting, while XRD analysis of these
solids confirmed the presence of aragonite. Granulometric characteristics, morphological features
and structural details of the aragonite needle-like particles confirm the significance of the nonclassical,
mesocrystal growth concept in their formation. In addition, this study exemplifies the role
biologically induced inorganic precipitation processes at the nanoscale in the formation of
aragonite a restricted Mediterranean environment.

• Keywords: aragonit; koloidno bijelilo; precipitacija; Mljetska jezera; Malo jezero
• Keywords (english): aragonite; whitning event; precipitation; Mljet Lakes; Malo jezero
• Language: croatian
• URN:NBN: urn:nbn:hr:169:779924
• Study programme: Title: 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: Access restricted to students and staff of home institution
• Created on: 2015-12-21 10:33:06