RESOURCES - PGM IN THE KOLA PENINSULA
AND WITHIN THE FEDOROV-PANA INTRUSION
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:
- 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.
- PGE-reefs in the Fedorov-Pana intrusion are associated with lens-like bodies of leucocratic rock species (leucogabbro, anorthosite, “mottled gabbro”).
- 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.
PGM in Kola
Web site created and managed by Resources Computing International Ltd