Founded 1934 by Prof. Dr Stefan Bončev
A Geo-Sciences Journal of the Geological Institute “Strashimir Dimitrov”, Bulgarian Academy of Sciences
Official Journal of the Carpathian-Balkan Geological Association

Mineral associations and their distribution in hydrothermal alteration zones of the Chelopech high-sulphidation deposit, Bulgaria

Pages: 
pp. 11-16
Sylvina Georgieva
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
Abstract: 

This study is focused on the mineral assemblages developed during hydrothermal alteration in the host rocks of the Chelopech deposit and aims to reveal some characteristics of ore-forming fluids. Three well-distinguished and simultaneously formed hydrothermal alteration zones, characterized by specific mineral associations, occur in the area: advanced argillic, sericitic and propylitic. The presence of silica residue localities in the advanced argillic zone marks the major channels of hydrothermal fluids and indicates participation of extremely acid fluids. The existence of alunite and zunyite in the alteration indicates development of acid-sulphate hydrothermal environment, with presence of F in the fluid, which is considered to be an important feature of ore-bearing high-sulphidation epithermal systems. Dickite in association with alunite in the upper levels of the deposit suggests temperature of formation 200–250 °C. The highest temperature in depth is limited up to 375 °C, considering the occurrence of zunyite, pyrophyllite and dickite.

Keywords: 

advanced argillic, sericitic, propylitic, acid-sulphate system, alunite, zunyite

DOI: 
10.52321/GeolBalc.46.2.11
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VOLUME 46 (2)/November 2017 125th Anniversary of Acad. Strashimir Dimitrov; 70th Anniversary of the Geological Institute, Bulgarian Academy of Sciences

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University of Mining and Geology, Department of Geology and Geoinformatics, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria; Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

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Mineral associations and their distribution in hydrothermal alteration zones of the Chelopech high-sulphidation deposit, Bulgaria

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