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The mineralogy of propylites of the large Peschanka porphyry copper deposit (West Chukotka)

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Abstract

The Au-Mo-Cu porphyry Peschanka deposit is confined to the Egdygkych Pluton (K1). The deposit comprises three major types of metasomatic rocks: quartz-K-feldspar-biotite, propylites and quartz-sericite. In their chemical compositions, amphiboles of propylites range from early magnesiohornblende to tremolite-actinolite. Compared to magmatic K-feldspar, the metasomatic K-feldspar is enriched in barium (up to 7.3 wt % BaO). Tourmaline belongs to the intermediate member of the oxydravite-povondraite series. The Al content in chlorite decreases to the outer zones of propylitization, which is caused by a decrease in the temperature of mineralization.

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  1. Faculty of Geology, Moscow State University, Moscow, 119991, Russia

    L. I. Maruschenko

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  1. L. I. Maruschenko
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Correspondence to L. I. Maruschenko.

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Original Russian Text © L.I. Maruschenko, 2013, published in Vestnik Moskovskogo Universiteta. Geologiya, 2013, No. 2, pp. 22–30.

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Maruschenko, L.I. The mineralogy of propylites of the large Peschanka porphyry copper deposit (West Chukotka). Moscow Univ. Geol. Bull. 68, 79–88 (2013). https://doi.org/10.3103/S0145875213020075

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