Abstract
The Urals can be regarded as a significant Cu-Mo-porphyry province, hosting over 30 porphyry deposits. Although their geological structure and ore-forming processes have been studied in great detail, uncertainty remains about their age and related geotectonic setting. In this contribution we report for the first time the Re-Os dating of molybdenites from three Cu-Mo porphyry deposits, namely Kalinovskoe, Mikheevskoe and Talitsa. Three molybdenite samples from the Kalinovskoe deposit yield Silurian Re-Os ages ranging from 427.1Ma to 431.7Ma (mean 429.8±4.8Ma; 2σ standard deviation), and a Re–Os isochron age of 430.7±1.3Ma (MSWD=0.63), which coincides with previous U-Pb zircon dating of ore-hosting diorites from the same ore field (427±6Ma). The molybdenite from the Mikheevskoe deposit gives Re-Os ages of 357.8±1.8Ma and 356.1±1.4Ma (mean 357.0±2.4Ma; Carboniferous/Tournaisian), which corresponds to previous U-Pb dating of zircons from the diorite hosting porphyry deposit (356±6Ma). The molybdenite from Talitsa Mo-porphyry deposit yields the youngest Re-Os ages of 298.3±1.3 and 299.9±2.9Ma (mean 299.1±2.3Ma) at Carboniferous-Permian boundary. Thus, the studied Cu and Mo porphyry deposits are not synchronous and belong to distinct tectonic events of the Urals.
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