OFS metallogenic types and subtypes, in brackets—GSB. Age range OFS formation, million years | Pre-ore | Ore formation steps | ||
1 | 2 | 3 | ||
1 | 3 | 4 | 5 | 6 |
Iron ore Baikal-Patom 1580-927 | Orthoamphibolites, partially granitized | Chlorite-actinolite-albite-epidote, plagioclase-actinolite-chlorite, quartz-chlorite-sericite-carbonate dynamoslates with hematite- magnetite mineralization |
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Pyrite-polymetallic (Tiya-Ollokit). 1500-550 | Orthoamphibolites, serpentinites | Graphite-garnet-quartz-double mica, graphite-carbonate- quartz-mica dynamoslates with strata-like deposits of quartz-sphalerite-galenite ores | Dynamometamorphic metasomatites, hydrothermalites of plagioclase-muscovite and quartz-muscovite composition with veinlet-disseminated polysulfide mineralization |
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