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The Čukaru Peki in the Timok district, Serbia, the western part of the Tethys metallogenic domain, is a giant porphyry and high sulfidation epithermal copper-gold deposit with typical mineralization and alteration zoning. Previous research has been carried out on the sulfides and alteration zoning, however, few focused on the geochemical characteristics of the alteration chlorite mineral associated with porphyry mineralization, and the indicators of prospecting and exploration. This study takes chlorite from the porphyry-type ore in the Čukaru Peki copper-gold deposit as the object of study, and uses microscopic electron probe microanalysis (EPMA) and laser-ablation inductively-coupled plasma-mass spectrometry (LA-ICP-MS) analytical techniques to define the type of chlorite and the characteristics of the main trace elements, and to explore the ore prospecting signatures of it. The results show that there are three main types of chlorite, namely, Chl-1 of the propylitic zone, Chl-2 of the phyllic/sericitization zone and Chl-3 of the potassic zone, among which, the chlorite in the propylitic zone can be further classified into two subclasses of the metasomatic type (Chl-1a) and the disseminated type (Chl-1b). All three types of chlorite belong to Mg-rich chlorite, of which, Chl-1 chlorite is clinochlore-chamosite chlorite, and Chl-2 and Chl-3 chlorite are sheridanite-prochlorite chlorite. The main substitution mechanism of chlorite is dominated by Fe2+ and Mg2+ substitution, while two types of substitution mechanisms, TK ((Si4+)IV + (Fe2+,Mg2+)VI=(Al3+)IV+(Al3+)VI) and DT (2(Al3+,Fe3+)VI +□VI= 3(Fe2+,Mg2+)VI) types, are also present. Based on chlorite thermometers, the Chl-3 chlorite formation temperature in the potassic zone (~325°C) is higher than that of the disseminated chlorite in the propylitic zone (~257°C). Compared with Chl-1 in the propylitic zone, Chl-2 and Chl-3 chlorite are closer to the hydrothermal centre and have higher Ti, K, V, Cr, Ti/Pb, Ti/Li and Ti/Sr ratios, and the Ti/Sr and Ti/Li ratios decrease with the distance from the ore body, so it is suggested that the hydrothermal centre of mineralization is deep in the north-western part of the Čukaru Peki Cu-Au deposit (1~2 km), and it is proposed that chlorite Ti/Sr ratio can be used as an indicator for prospecting in the Čukaru Peki porphyry Cu-Au deposit. © 2025 Editorial Department of Mineral Deposits. All rights reserved.
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Mineral Deposits
ISSN: 0258-7106
Year: 2025
Issue: 1
Volume: 44
Page: 215-230
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 3
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