Geologicheskii Vestnik

The distribution of REE and Y in calcite of Au-Cu-porphyry ores and in host rocks of the Kutuevka ore occurrence located in the zone of the Main Ural Fault in the Southern Urals is studied. The content of REE and Y was determined by inductively coupled plasma mass spectrometry (ICP-MS) on the ELAN 9000 spectrometer at the IGG of the Ural Branch of the Russian Academy of Sciences. It is shown that calcite and intrusive rocks of the ore occurrence have similar REE patterns, characterized by the accumulation of light lanthanides, the lack of differentiation among heavy REEs, and negative Ce anomalies. A distinctive feature of calcite is the positive Eu anomalies, indicating a high-temperature environment of its formation (>250°C) from the reduced uid. The Y/Ho values in calcite and host rocks indicate a uid/limestone interaction. The results of the studies con rm the conclusion obtained on the basis of isotopic data about the participation of uids and components of magmatogenic and metamorphogenic nature in the formation of porphyry mineralization.

Southern Urals, Au-Cu-porphyry mineralization, rare earth elements, yttrium, Eu anomalies

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