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A Zincian Chrome-Spinel from the Cr-Ba-Fe-Cu-Zn Deposit near Busovaca (Bosnia and Herzegovina)

I. Jurković
M. Jakšić

Puni tekst: engleski, pdf (12 MB) str. 83-102 preuzimanja: 388* citiraj
APA 6th Edition
Jurković, I. i Jakšić, M. (1994). A Zincian Chrome-Spinel from the Cr-Ba-Fe-Cu-Zn Deposit near Busovaca (Bosnia and Herzegovina). Geologia Croatica, 47 (1), 83-102. Preuzeto s https://hrcak.srce.hr/19575
MLA 8th Edition
Jurković, I. i M. Jakšić. "A Zincian Chrome-Spinel from the Cr-Ba-Fe-Cu-Zn Deposit near Busovaca (Bosnia and Herzegovina)." Geologia Croatica, vol. 47, br. 1, 1994, str. 83-102. https://hrcak.srce.hr/19575. Citirano 21.11.2019.
Chicago 17th Edition
Jurković, I. i M. Jakšić. "A Zincian Chrome-Spinel from the Cr-Ba-Fe-Cu-Zn Deposit near Busovaca (Bosnia and Herzegovina)." Geologia Croatica 47, br. 1 (1994): 83-102. https://hrcak.srce.hr/19575
Harvard
Jurković, I., i Jakšić, M. (1994). 'A Zincian Chrome-Spinel from the Cr-Ba-Fe-Cu-Zn Deposit near Busovaca (Bosnia and Herzegovina)', Geologia Croatica, 47(1), str. 83-102. Preuzeto s: https://hrcak.srce.hr/19575 (Datum pristupa: 21.11.2019.)
Vancouver
Jurković I, Jakšić M. A Zincian Chrome-Spinel from the Cr-Ba-Fe-Cu-Zn Deposit near Busovaca (Bosnia and Herzegovina). Geologia Croatica [Internet]. 1994 [pristupljeno 21.11.2019.];47(1):83-102. Dostupno na: https://hrcak.srce.hr/19575
IEEE
I. Jurković i M. Jakšić, "A Zincian Chrome-Spinel from the Cr-Ba-Fe-Cu-Zn Deposit near Busovaca (Bosnia and Herzegovina)", Geologia Croatica, vol.47, br. 1, str. 83-102, 1994. [Online]. Dostupno na: https://hrcak.srce.hr/19575. [Citirano: 21.11.2019.]

Sažetak
The metamorphic complex of the Busovaca area is mostly composed of Upper Silurian-Lower Devonian metapelites, metapsammites and metarhyolites formed under low grade metamorphism at 350° to 450°C and 3 to 5 kbars. The ore minerals of the Busovaca deposit are: magnetite (with relics of zincian chrome-spinel), rimmed by ferrichromite, and pyrite, chalcopyrite, enargite, bornite and siegenite. The gangue minerals are: siderite, quartz, albite, hyalophane, muscovite, chromian-chlorite and manganoan ankerite. Proton microprobe analyses (PIXE) were made of samples A (core Ac of the slightly altered chrome-spinel), B (strongly altered chrome-spinel with Bc-core, Bfc-ferrichromite zones, Br-magnetite rim) and C (cryptically zoned magnetite with Cc-core and Cr-magnetite rim). The results are recalculated in formulae, and presented on separate diagrams.

The optical investigations, microprobe analyses, beam-scan photographs, diffusion rates of Mg, Al, Zn, Cr, and Mn, and diagrams, allow the following conclusions to be made: (1) magmatic origin of the primary chrome-spinel, (2) the emplacement of the Zn was prior to the alteration under very low f02, most probably synchronous with the sulphide mineralization; (3) the alteration process took place in two phases: (a) the early stage volume-for-volume replacement and formation of the ferrichromite and magnetite zones, (b) the late stage characterized by decolourization and/or resorption, and/or dissolution of the core (patches, specks, “atoll structure”); (4) released Al, Cr, Mn, and Zn have been taken up by silicate, carbonate and oxide minerals forming chromian-chlorite, manganoan ankerite or contaminated siderite and pyrite; (5) the diffusion rates among Al, Zn, Cr, and Mn during different stages of the alteration have the following sequence: Al - Zn - Cr - Mn; (6) the optically unzoned magnetite crystals or aggregates originated in chrome-spinel; (7) the mineral assemblage of the Busovaca deposit co-exists with the surrounding metamorphic complex belonging to the greenschist facies.

Ključne riječi
Zincian chrome-spinel; Composition; Genesis; Alteration; Busovaca; Bosnia

Hrčak ID: 19575

URI
https://hrcak.srce.hr/19575

Posjeta: 597 *