Abstract

The Erdenet porphyry copper-molybdenum deposit in central Mongolia is hosted in the Selenge Intrusive Complex and is genetically related to the Late Triassic and Early Jurassic volcanic units in the complex. The deposit is part of a porphyry association that consists of two main stages: granodiorite porphyry and dacite; and granite porphyry and leucogranite. The main chalcopyrite and molybdenite mineralization is associated with both of the main stages of this association. Three main types of alteration occur: sericitic (quartz-sericite) and late siliceous, intermediate argillic (chlorite-sericite), and propylitic (chlorite and epidote-chlorite). These three alteration types occur in zones in the Erdenet deposit. Geochemical and supporting petrographic data show that leaching of Na and deposition of SiO2 occurred during quartz-sericite alteration. The distribution of trace elements reflects relative mobility during alteration, with HFSE (Zr and Ti) being the most immobile and the lithophile and chalcophile elements being the most mobile.

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