ПІРОТИН В РУДНИХ ЗОНАХ МАЙСЬКОГО ЗОЛОТОРУДНОГО РОДОВИЩА: ОСОБЛИВОСТІ СКЛАДУ ТА МІСЦЕ В ПРОЦЕСІ РУДОУТВОРЕННЯ

Анотація

The Mayske gold deposit (the Ukrainian shield) is the analogue of world Archaean
lode-gold deposits. Ore mineralization has postmetamorphic origin. Sulfide minerals have
been developed in the system of veinlets in wall rocks. Pyrrhotite mineralization forms at
the early stages of hydrothermal process. All further mineralization develops by
replacement of pyrrhotite. Sulfides and gold pseudomorphically replace pyrrhotite grains.
Hexagonal and monoclinic pyrrhotites are presented. Aggregates consist of only one
modification are uncommon. As a rule content of monoclinic pyrrhotite in pyrrhotite
aggregates is averaged of 15-40%. Monoclinic pyrrhotite replaces hexagonal pyrrhotite
together with forming of association gold + pyrite-3 + chalcopyrite-2 + carbonates.
Hexagonal pyrrhotite was formed at the temperatures above 500°C. Conversion of
hexagonal pyrrhotite in monoclinic was held at the temperatures below 272°C.