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.