Mikrofiziografija i geneza granata iz pegmatita kamenoloma Srednja rijeka (Moslavačka gora)

undergraduate thesis

• Title (english): Microtextural relations and genesis of garnet from Srednja Rijeka quarry (Mt. Moslavačka Gora)
• Author: Fran Hromiš
• Mentor: Dražen Balen (mentor)
• Committee member: Dražen Balen (predsjednik povjerenstva)
• Committee member: Zorica Petrinec (član povjerenstva)
• Committee member: Borna Lužar-Oberiter (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2024-09-13, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology

Abstract

Na lokalitetu Srednja rijeka (Moslavačka gora) pronađeni su granati. Nalazili su se unutar leukogranitskih žila koje presjecaju dvotinjčasti granit. Makroskopskom i mikroskopskom analizom leukogranita utvrđene su glavne mineralne vrste: kvarc, K-feldspati, tinjci, andaluzit uz turmalin i granat. Rendgenskom difrakcijom na prahu izdvojenog granata ustanovljeno je da se radi o almandinskom varijetetu granata s dimenzijom jedinične ćelije a0 = 11,54 [Å]. Usporedbom prikupljenih podataka o opaženoj mineralnoj zajednici te podataka prikupljenih rendgenskom difrakcijom na prahu s drugim znanstvenim istraživanjima ustanovljeno je da je temperatura kristalizacije leukogranitnog magmatskog sustava koji sadrži almandinski granat morala biti na početku kristalizacije u okvirima raspona temperatura između 700 i 800 stupnjeva celzijusa te na kraju kristalizacije tlak manji od 400 MPa.

Abstract (english)

Minerals from the garnet mineral group were found at the Srednja rijeka site (Moslavačka gora). They were located within the leucogranite veins that cut through the two-mica granite. Macroscopic and microscopic analysis of leucogranite revealed the main mineral types: quartz, K-feldspars, mica, andalusite along with tourmaline and garnet. By X-ray powder diffraction of the isolated garnet, it was established that it is an almandine variety of garnet with a unit cell dimension of a0 = 11.54 [Å]. By comparing the collected data on the observed mineral and the data collected by X-ray powder diffraction with other scientific research, it was established that the crystallization temperature of the leucogranite magmatic system containing almandine garnet must have been at the beginning of crystallization within the temperature range between 700 and 800 degrees Celsius and at the end of crystallization pressure less than 400 MPa.

• Keywords: granati; Moslavačka gora; leukogranit
• Keywords (english): garnets; Moslavačka gora massive; pegmatites
• Language: croatian
• URN:NBN: urn:nbn:hr:217:532863
• 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: Born digital
• Access conditions: Open access
• Created on: 2025-02-07 07:45:22