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Evolution of ore-forming fluids in the Mid-Bosnian schist mountains (CROSBI ID 497143)

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Palinkaš, Ladislav ; Strmić, Sabina ; Pavlović, Gordana ; Jurković, Ivan ; Hrvatović, Hazim Evolution of ore-forming fluids in the Mid-Bosnian schist mountains // Vijesti Hrvatskoga geološkog društva / Tomljenović, Bruno ; Balen, Dražen ; Saftić, Bruno (ur.). 2000

Podaci o odgovornosti

Palinkaš, Ladislav ; Strmić, Sabina ; Pavlović, Gordana ; Jurković, Ivan ; Hrvatović, Hazim

engleski

Evolution of ore-forming fluids in the Mid-Bosnian schist mountains

The Midd-Bosnian Schist Mountains (MBSM) are a part of the Central Dinarides, (Fig. 1.a), which represents a typical orogenic belt located along the northeastern flank of the Adriatic microplate. In this large area, genetically different rock formations, originated during the Alpine Wilson cycle in the Dinaridic parts of Tethys. The most widespread rocks of the MBSM however are pre- Devonian metamorphic rocks. Crystallization age of these rocks obtained by K/Ar dating is 343ą13 Ma (PALINKAŠ et al., 1996). Fossiliferous Devonian carbonate rocks overlie this metamorphic complex. The main phase of volcanic activity occurred during Permian time (JURKOVIĆ, 1957). Quartz- porphyries and adjacent ore deposits are probably formed at a post-collisional phase of the Hercynian orogeny or incipient, widespread rifting within Pangea (PALINKAŠ, 1990). The objects of fluid inclusion study were quartz, barite and hyalophane from Čemernica, Međuvršje, Raštelica, Berberuša, Hrmza and Busovača ore deposits in the MBSM, (Fig. 1.a). The results of microscopic examination and microthermometric measurement suggest the two end-member sources of fluids: 1. Magmatogenic (aqueous), related to quartz-porphyry magmatism, determined in samples from Raštelica and Hrmza ; 2. Metamorphogenic (aqueous-carbonic), determined in samples from Alpine-quartz veins in Busovača and Berberuša. 1.Aqueous FIs from Raštelica and Hrmza are highly saline CaCl2-NaCl- H2O (32, 0-32, 9 wt.% equ. NaCl, Raštelica and >24 wt.% equ. NaCl, Hrmza) with presence of other cations (during a freezing cycle 4 or 5 types of hydrates could be developed). Aqueous FIs from Čemernica are moderately saline (15-20.2 wt.% equ. NaCl) NaCl-KCl-H2O FIs. Temperature of total homogenization into liquid phase (Th TOT) in samples from Raštlica is between 220-345°C, with maximum at 240°C, and in Hrmza is between 150- 210°C, with maximum at 180°, what suggests distinguished ore-forming environments, spatially related to quartz-porphyry volcanism. 2.Aqueous- carbonic FIs contain, beside CO2, other volatiles. Micro Raman spectroscopy recognized in samples from Busovača, presence of CO2, H2O, N2, and carbonates as daughter minerals (PALINKAŠ et al., 1996). Salinity varies between 2-4 wt.% equ. NaCl in Berberuša and 6.6-13.5 wt.% equ. NaCl in Busovača. Th is between 270 -330°C. 3.Complex assemblages of FIs, composed of both types are determined in Čemernica and Međuvršje. Aqueous FIs from Čemernica were determined as moderately saline NaCl-KCl-H2O (15-20.2 wt.% equ. NaCl), and aqueous FIs from Međuvršje have the same characteristics as FIs from Raštelica. Aqueous- carbonic FIs contain, beside CO2, other volatiles. Salinity varies from 6.6-13.5 wt.% equ. NaCl in Čemernica to even 14.0-14.8 wt.% equ. NaCl in Kreševo. Observed Th in all those FIs is between 270-330°C, except in aqueous FIs from Čemernica with Th between 150-230°C. The P-T-X characteristics of FIs from the MBSM show a complex geological history of the area, which underwent poly-phase metamorphism, (Fig.1b). The P-T-t metamorphic loop for fluids from Čemernica is constructed on the basis of metamorphic phase analysis (MAJER et al., 1991). The shape of the loop appropriates to the path of the regional metamorphism caused by collisional processes. The high salinity of magmatogenic FIs, presence of gangue mineral barite, and enargite among other Cu-sulfosalts, temperature of homogenization around 300°C are characteristics of epithermal high sulfidation ore deposits (HEDENQUIST, 1995). Occurrence of calcite and carbonates within veins is in contradiction with this supposition, but deposition in carbonate rich environment could be a reason for neutralization of originally acid hydrotherms. Presence of ubiquitous values of δ 34S around 10 0/00 in barite suggests, however, extensive contribution of sulfates from the Permian sea water. It means that great deal of barite-tetrahedrite deposits are formed under circumstances close to lowsulfidation style of formation. At present knowledge any firmer genetical interpretation is not prudent.

Central Bosnia; Dinarides; Fluid inclusion; Quartz; Barite; Hyalophane; High sulfidation

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Podaci o prilogu

2000.

nije evidentirano

objavljeno

Podaci o matičnoj publikaciji

Vijesti Hrvatskoga geološkog društva

Tomljenović, Bruno ; Balen, Dražen ; Saftić, Bruno

Zagreb: Hrvatsko geološko društvo

1330-1357

Podaci o skupu

Geological Meeting on Dynamics of Ongoing Orogeny "Pannonian Basin, Carpathian and Dinaride Sytem"

poster

01.10.2000-03.10.2000

Dubrovnik, Hrvatska

Povezanost rada

Geologija