Evolucija rudonosnih fluida rudnog tijela Bunardžik u bakrenom porfirnom ležištu Bučim, Republica Sjeverna Makedonija

master's thesis

• Title (english): Evolution of ore-bearing fluids in the Bunardžik ore body, the Bučim porphyry copper deposit, Republic of North Macedonia
• Author: Barbara Britvić
• Mentor: Andrea Čobić (mentor)
• Mentor: Sabina Strmić Palinkaš (mentor)
• Committee member: Andrea Čobić (predsjednik povjerenstva)
• Committee member: Nenad Tomašić (član povjerenstva)
• Committee member: Maja Martinuš (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2022-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Mineralogy and Petrology

Abstract

Porfirno bakreno ležište Bučim (41.7° N, 22.3° E) nalazi se u državi Sjevernoj Makedoniji, 120 km jugoistočno od glavnog grada Skoplja te 15 km zapadno od grada Radoviš. Samo ležište sadrži četiri rudna tijela: Vršnik, Čukar, Centralno rudno tijelo te Bunardžik. Glavni rudni mineral je halkopirit koji je u asocijaciji s piritom, magnetitom, hematitom i rutilom dok je glavni jalovinski mineral kvarc. U ovom radu utvrđeno je sedam tipova fluidnih inkluzija na temelju njihovog petrološkog izgleda te prisutnosti faza: parne, tekuće, soli i rudnog minerala. Za visoko-temperaturne (418 - 643 °C) i visoko-slane inkluzije (30.72 - 59.95 tež. % NaCl ekviv.) smatra se da su rudonosne. Fluidne inkluzije rudnog tijela Bunardžik tipične su za porfirna bakrena ležišta izuzev 10-ak mjerenja inkluzija koje homogeniziraju pri temperaturama od 1200°C - 1300°C. Analizom fluidnih inkluzija u rudnom tijelu Bunardžik otkrivena su tri tipa fluida: fluid 1 čine visoko temperaturne i visoko slane grupacije fluidnih inkluzija (FIA). FIA dvofaznih i višefaznih inkluzija ovog fluida dokaz je ključanja, a raspon Th jest 513-1292°C. Određene faze soli su halit i silvit. Fluid 2 predstavlja FIA koje osim parne i tekuće faze mogu sadržavati jedan ili više kristala soli (L+V i L+V+S). Kristal soli predstavlja halit, te ovaj fluid ne sadrži rudonosni mineral. Raspon Th jest 288 - 643°C dok je raspon saliniteta 15.70 - 59.95 tež. % NaCl ekviv. Fluid 3 čine inkluzije samo s tekućom i parnom fazom (L+V), i umjerenog su saliniteta (15.70 - 47.77 tež. % NaCl ekviv.). Raspon Th jest 288 - 525°C.

Abstract (english)

The Bučim porphyry copper deposit (41.7° N, 22.3° E) is located country of North Macedonia, about 120 km southeast of the capital Skopje and 15 km west of the town of Radoviš. The deposit itself contains four ore bodies: Vršnik, Čukar, Central ore body and Bunardžik. The main ore mineral is chalcopyrite, which is associated with pyrite, magnetite, hematite and rutile, while the main tailings mineral is quartz. Seven types of fluid inclusions were determined based on their petrological appearance and the presence of phases: vapour, liquid, salt phase and ore mineral. High-temperature (418 - 643 °C) and high-salinity inclusions (30.72 - 59.95 wt. % NaCl equiv.) are believed to be ore-bearing. Fluid inclusions of the Bunardžik ore body are typical for porphyry copper deposits, with the exception of about 10 measurements of inclusions that homogenize at temperatures between 1200°C - 1300°C. The analysis of fluid inclusions in the Bunardžik ore body revealed three types of fluids: Fluid 1 is characterized by high temperature and high saility. The FIAs composed of coexisting two-phase and multiphase inclusions reflect a fluid immiscibility. Determined salt phases are halite and sylvite. Th ranges between 513 and 1292°C. Fluid 2 is represented by multiphase inclusions which, in addition to vapor and liquid phases, may also contain one or more salt crystals (L+V and L+V+S). The salt crystal represents halite, this fluid does not contain an ore-bearing mineral. Th range is 288 - 643°C while salinity range is 15.70 - 59.95 wt. % NaCl equiv.). Fluid 3 is represented by two-phase inclusions (L+V) of moderate salinity. Th ranges between 288 and 525°C while salinity ranges between 15.70 and 47.77 wt. % NaCl equiv.

• Keywords: fluidne inkluzije; fluid; Bučim; porfirno bakreno ležište
• Keywords (english): fluid inclusions; fluid; Bučim; porphyry copper deposit
• Language: croatian
• URN:NBN: urn:nbn:hr:217:174296
• 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; Embargo expiration date: 2024-09-23
• Created on: 2023-01-27 11:22:09