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An isotopic study was systemically carried out on the granitic complex, diorite‐porphyrite, ores and ore minerals of the 103 Ma Xiaoxinancha gold‐rich copper deposit in Jilin province to determine the geodynamic model of diagenesis and metallogenesis. Results show that the initial Nd and Sr isotopic compositions of the granitic complex are in the range of 0.70425–0.70505 for (87Sr/86Sr)i, 0.51243–0...