Key criteria for PGE-localization within the Fedorov-Pana intrusion

The low sulfide content is a major feature of the PGE-mineralization in the Fedorov-Pana intrusion, since it is unlikely to be found completely without sulfides . Newly established criteria for idenitification of PGE-mineralized levels in the intrusion are as follows:

  1. Alternations of thin layers of petrologically different rocks (e.g., leuco- and mesocratic gabbro, anorthosite, norite, pyroxenite) is a classic signature of PGE-reefs. Sulfides in monotonous units (up to 10-15 levels through the whole intrusion) contain, as a rule, no more than 1 ppm of total PGEs. The layered horizons (LLH, ULH, LH of the East Pana Massif) host the main PGE-mineralization. Not every level with alternating rock layers is mineralized, but all layers have siginificant PGE anomalies. Furthermore, an absence of PGE anomalies in certain outcrops or boulders of a layered horizon is often caused by nugget effect, e.g., the Southern Reef.
  2. PGE-reefs in the Fedorov-Pana intrusion are associated with lens-like bodies of leucocratic rock species (leucogabbro, anorthosite, “mottled gabbro”).
  3. Taxitic and coarse-grained rocks are typical of those parts of layered horizons, which are enriched in PGE. Sometimes, as in the East Pana Massif, the PGE-mineralization is associated with pegmatitic rocks. However, it should be noted that this criterion is reliable only in combination with the first two criteria.

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