Analiza vzorcev kamnin v Škofjeloškem hribovju z rentgensko praškovno difrakcijo

Mrkulić, Tian (avtor), Počkaj, Marta (mentor)

Škofjeloško hribovje je predalpska geografska regija v severozahodni Sloveniji, ki leži v porečju Selške in Poljanske Sore. Ima zelo bogato zgodovino razvoja in pestro kamninsko sestavo. Sestavljeno je iz apnencev, dolomitov, konglomerata, veliko je glinovcev, peščenjakov in skrilavcev, ponekod je prisoten tudi lapor. Z rentgensko praškovno difrakcijo sem kvalitativno in kvantitativno analiziral 14 vzorcev kamnin, odvzetih na območju Škofjeloškega hribovja. Kot pomoč pri analizi smo nekatere vzorce analizirali tudi z vrstičnim elektronskim mikroskopom, s katerim smo izvedli elementno analizo. Kvalitativno fazno analizo sem izvedel s programom Crystallographica Search-Match, kjer sem difraktograme vzorcev primerjal z difraktogrami standardov in tako določil fazno sestavo vzorcev. Pri nekaterih vzorcih nisem mogel določiti vseh prisotnih faz, saj na podlagi nekaj zelo šibkih uklonskih vrhov nisem mogel z gotovostjo trditi, da je faza v vzorcu res prisotna. Kvantitativno fazno analizo sem naredil v programu Topas z Rietveldovo metodo, s pomočjo katere sem določil masne deleže oziroma masna razmerja med identificiranimi fazami. Identificiral sem kar nekaj različnih mineralov in ugotovil, da je v Škofjeloškem hribovju najbolj razširjen kremen. Poleg kremena sem identificiral še kalcit, dolomit, fluorit, ter nekatere silikatne minerale. Vzorce, ki so bili odvzeti iz istih delov Škofjeloškega hribovja, sem med seboj primerjal in opazoval, kako se delež posameznih mineralov spreminja z nadmorsko višino. Svoje ugotovitve sem primerjal še z geološko karto Slovenije.

• Jezik: Slovenski jezik
• Ključne besede: Škofjeloško hribovje, rentgenska praškovna difrakcija, kvalitativna analiza, kvantitativna analiza, minerali
• Vrsta gradiva: Diplomsko delo/naloga
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Leto izida: 2026
• PID: 20.500.12556/RUL-181114
• COBISS.SI-ID: 274140163
• Datum objave v RUL: 25.03.2026

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Analysis of rock samples from Škofja Loka hills by means of X-ray powder diffraction

Izvleček

The Škofja Loka Hills are a pre-Alpine geographical region in northwestern Slovenia, located between of the Selška and Poljanska Sora rivers. The region has a very rich developmental history and a diverse geological composition. It is made up of limestones, dolomites, conglomerates, and contains significant amounts of claystones, sandstones, and shales, with marl in some areas as well. Using X-ray powder diffraction, I performed qualitative and quantitative analyses on 14 rock samples collected from the Škofja Loka Hills area. To support the analysis, we also examined some samples with a scanning electron microscope, through which we carried out elemental analysis. Qualitative phase analysis was performed using the program Crystallographica Search-Match, where I compared the diffractograms of the samples with standard reference diffractograms to determine their phase composition. For some samples, not all present phases could be identified, since a few very weak diffraction peaks did not provide sufficient certainty to confirm the presence of a phase in the sample. Quantitative phase analysis was conducted in Topas using the Rietveld method, which enabled me to determine the mass fractions, i.e., the mass ratios, of the identified phases. I identified several different minerals and found that quartz is the most widespread in the Škofja Loka Hills. In addition to quartz, I also identified calcite, dolomite, fluorite, and several silicate minerals. I compared samples collected from the same parts of the Škofja Loka Hills and observed how the proportion of individual minerals changes with altitude. Finally, I compared my findings with the Geological Map of Slovenia.

• Ključne besede: Škofja Loka Hills, X-ray powder diffraction, qualitative analysis, quantitative analysis, minerals