Mineraloške i petrološke karakteristike uzoraka iz bušotine B3/17 u istražnom prostoru Lovno-3 kraj Lepoglave

master's thesis

• Title (english): Mineralogical and petrological characteristics of samples from the B3/17 borehole in the Lovno-3 exploration field near Lepoglava
• Author: Marko Jajac
• Mentor: Darko Tibljaš (mentor)
• Committee member: Darko Tibljaš (predsjednik povjerenstva)
• Committee member: Dražen Balen (član povjerenstva)
• Committee member: Jasenka Sremac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2019-07-08, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Mineralogy and Petrology

Abstract

Mineraloško-petrografska analiza 12 istraţivanih uzoraka jezgre iz bušotine B3/17 pokazala je da istraţivane stijene pripadaju andezitbazaltu (7 uzoraka), breĉi (2 uzorka), izrazito kalcitiziranoj stijeni koju nije bilo moguće jednoznaĉno determinirati (2 uzroka) i hijaloklastitu (1 uzorak). Stijene su snaţno alterirane, maslinastozelene do sivozelene i smeĊeljubiĉaste boje, mandulaste teksture, porfirne do glomeroporfirne strukture. Osnova efuzivnih varijeteta je intersertalna (4 uzroka), vitrofirna do intersertalna (3 uzorka), hipohijalina (2 uzroka) i hijalopilitska (1 uzorak)te je izgraĊuju mikroliti feldspata, klorit, sericit, kalcit i vulkansko staklo. Kao fenokristali odreĊeni su feldspata koji su u potpunosti izmijenjeni, sericitizirani, kalcitizirani i kloritizirani Mandule su: kalcitne, kloritne i kalcedonske/opalne. Pukotine ispunjava sekundarni karbonat. XRD analiza potvrdila je mineralni sastav uzoraka . Tri razliĉita varijeteta istraţivanih stijena izabrana su za kemijsku analizu glavnih, sporednih, elemenata u tragovima i elemenata rijetkih zemalja. Prema kemijskoj klasifikaciji za efuzivne stijene, u TAS – dijagramu, uzorci se projiciraju u polje fono-tefrita, bazaltnog trahiandezita i na granicu fono-tefrita i bazaltnih trahiandezita dok na osnovu sadrţaja Na2O i K2O dva uzorka pripadaju šošonitima. Odnos omjera elemenata Nb/Y – Zr/TiO2 uzorke klasificira kao andezit/bazalt do andezit.

Abstract (english)

The mineralogical-petrological analysis of 12 core samples from the exploration well B3/17 has shown that 7 of the examined rocks classify as basaltic andesite, 2 as breccia, 2 as extremely calcitised rocks that could not have been unambiguously determined and 1 as hyaloclastite. The rocks have an amygdaloidal texture, porphyritic/glomeroporphyritic structure and are strongly altered. Their colour varies from olive and greyish-green to brownish-purple. The groundmass of the effusive varieties is intersertal (4 samples), vitrophyric/intersertal (3 samples), hypohyaline (2 samples) and hyalopilitic (1 sample) and consists of chlorite, sericite, calcite and volcanic glass. The phenocrysts that were found were recognised as completely altered, sericitised, calcitised and chloritised feldspars. The amygdules are composed of calcite, chlorite and chalcedony/opal and the cracks are filled by secondary carbonate. The XRD analysis has confirmed the microstructural composition of the samples. Three different varieties of the examined rocks were chosen for the chemical analysis of major, minor, trace and rare earth elements. According to the chemical classification of effusive rocks based on the TAS diagram, the samples correspond to phonotephrite and basaltic trachyandesite, and one sample is on the border between the two mentioned fields. Based on the Na2O and K2O content, two of the samples classify as shoshonites, while according to the Nb/Y-Zr/TiO2 element ratios they are representative of basaltic andesite to andesite.

• Keywords: andezit/bazalti; bušotina B3/17; istraţni prostor Lovno-3; Lepoglava; Republika Hrvatska
• Keywords (english): borehole; andesite/basalt; exploration well Lovno-3; Lepoglava; Croatia
• Language: croatian
• URN:NBN: urn:nbn:hr:217:386829
• Study programme: Title: Graduate university study of 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: Open access
• Created on: 2019-09-09 11:36:40