The　Čukaru　Peki　Cu-Au　deposit　is　a　recently　discovered　giant　porphyry-epithermal　Cu-Au　deposit　in　the　western　Tethys　metallogenic　domain,　Serbia.　It　is　primarily　found　in　Late　Cretaceous　andesite　containing　hornblende　and　plagioclase　and　exhibits　distinct　alteration　zoning　characteristics,　making　it　an　ideal　subject　for　studying　the　exploration　index　system　of　altered　minerals.　In　this　study,　we　analyzed　the　mineral　chemical　composition　of　epidote　in　the　deposit　using　microscopic　electron　probe　microanalysis　(EPMA)　and　Laser　Ablation　Inductively　Coupled　Plasma　Mass　Spectrometry　(LA-ICP-MS)　techniques　while　considering　drilling　catalog　information.　Based　on　the　occurrence　of　epidote,　we　divided　it　into　two　types:　type　Ⅰ　epidote　found　in　the　phyllic　alteration　zone　and　type　Ⅱ　epidote　found　in　the　propylitic　alteration　zone.　The　results　derived　from　electron　probe　analyses　indicate　negative　correlations　in　both　varieties　of　epidote　between　the　content　of　Al　and　Fe,　and　Ca　and　Mn,　while　the　contents　of　Al,　Fe,　and　Mn　were　obviously　different.　Type　I　epidote　was　poor　in　Fe　and　Mn,　rich　in　Al　elements,　with　a　relatively　low　XFe　value.　Type　Ⅱ　epidote　exhibits　an　enrichment　in　Fe　and　Mn　and　low　in　Al　elements,　indicating　higher　XFe　ratios.　Combined　with　the　mineral　phase　characteristics,　we　propose　that　type　Ⅰ　epidote　is　altered　by　plagioclase,　and　type　Ⅱ　epidote　is　altered　by　hornblende.　This　suggests　that　the　variations　in　the　major　elements　of　epidote　are　governed　by　the　minerals　present　prior　to　alteration.　The　results　of　LA-ICP-MS　analysis　indicate　an　increasing　trend　in　the　contents　of　Pb,　Sb,　and　Ba　from　deep　to　shallow　in　the　propylitic　alteration　zone,　while　shallow　epidote　shows　low　Mo　content.　In　type　Ⅱ　epidote,　the　contents　of　Mn,　Al,　and　Mg　increase　initially　with　depth　before　decreasing,　whereas　the　contents　of　As,　Fe,　and　Ca　exhibit　the　opposite　trend.　Due　to　the　influence　of　temperature　and　other　physicochemical　conditions　on　the　variation　of　trace　element　indicators　in　epidote,　the　spatial　distribution　patterns　of　Mg,　Pb,　Sb,　Ba,　Mo,　Mn,　and　As　in　epidote　from　the　Čukaru　Peki　copper-gold　deposit　suggest　that　the　hydrothermal　center　of　this　porphyry-type　deposit　is　located　1~2　kilometers　beneath　the　Mn　anomaly.　Additionally,　it　is　noted　that　major　elements　such　as　Al　and　XFe　in　type　Ⅱ　epidote　display　similar　variations　with　Mn　trace　elements,　while　Ca　and　Fe　exhibit　opposing　trends.　Consequently,　it　is　suggested　that　Al,　XFe,　Ca,　and　Fe　within　type　Ⅱ　epidote　could　serve　as　innovative　indicators　for　mineral　exploration.　©　2024　Editorial　Department　of　Mineral　Deposits.　All　rights　reserved.