Mineraloška karakterizacija sagvandita iz Troms i Finnmark pokrajine, Norveška

undergraduate thesis

• Title (english): Mineralogical characterization of sagvandite from Troms and Finnmark county, Norway
• Author: Ivana Benčić
• Mentor: Andrea Čobić (mentor)
• Committee member: Andrea Čobić (predsjednik povjerenstva)
• Committee member: Dražen Balen (član povjerenstva)
• Committee member: Borna Lužar-Oberiter (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2021-09-24, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology

Abstract

U sklopu ovog rada anlizirana je stijena sagvandit iz pokrajine Troms i Finnmark u sjevernoj Norveškoj. Uzorci stijene prikupljeni su na tipskom lokalitetu u blizini grada Troms. Budući da stijena sagvandit ima značajan potencijal zbog prikupljanja ugljikovog dioksida iz atmosfere prilikom njezinog formiranja posljednjih je godina u fokusu istraživanja. Kako bi se utvrdio potencijal za sekvestraciju ugljikova dioksida potrebno je analizirati stijenu odnosno njezine karakteristike. U sklopu ovog rada utvrđene su mineralne faze od kojih je izgrađena stijena sagvandit. Analizirana su četiri makroskopska uzorka prikupljena na tipskom lokalitetu. Rezultati optičkih istraživanja u prolaznoj svjetlosti i difrakcije rendgenskih zraka na prahu pokazali su da stijenu grade ortopirokseni enstatit i broncit među kojima intersticijski kristalizira magnezit. Pirokseni se izmijenjuju u serpentine, talk i antofilit, te u manje zastupljene klorit, biotit i vermikulit. Prisutni su i minerali grupe spinela koji su uglavnom vezani uz pojavu serpentina, rjeđe se pojavljuju u piroksenima. Poznavanjem mineraloških karakteristika stijene sagvandita dobivamo jasniju sliku o uvjetima i načinu njezina nastanka.

Abstract (english)

As part of this study a sagvandite rock from Troms and Finnmark county in North Norway is analysed. Rock samples were collected at a type locality near the town of Troms. Because sagvandite has significant potential due to the collection of carbon dioxide from the atmosphere during its formation it has been in the focus of research in recent years. In order to determine the potential for carbon dioxide sequestration, it is necessary to analyze the rock as well as its characteristics. As part of this study mineral phases from which the sagvandite rock was built were determined. Four macroscopic samples collected at the type locality were analyzed. The results of optical studies in transmitted light and X-ray powder diffraction showed that the rock is formed by orthopyroxene enstatite and broncite among which magnesite crystallizes interstitially. Pyroxenes are altered to serpentine, talc and anthophyllite, and to less represented chlorite, biotite and vermiculite. Minerals of the spinel group are also present, which are mainly related to the appearance of serpentine, less frequently related to pyroxenes. By knowing the mineralogical characteristics of the sagvandite rock, we are getting a clearer picture of the conditions and manner of its formation.

• Keywords: stijena sagvandit; mineralni sastav; pirokseni; magnezit; talk; serpentin
• Keywords (english): sagvandite rock; mineral composition; pyroxene; magnesite; talc; serpentine
• Language: croatian
• URN:NBN: urn:nbn:hr:217:962418
• Study programme: Title: Geology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) geologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) geologije)
• Type of resource: Text
• File origin: Reformatted digital
• Access conditions: Open access
• Created on: 2025-02-06 08:20:44