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Fluid evolution associated with the early Proterozoic Rauhala Zn-Cu-Pb sulphide deposit in Ylivieska, Western Finland

1992; Elsevier BV; Volume: 4; Issue: 5 Linguagem: Inglês

10.1127/ejm/4/5/1069

1617-4011

M. Poutiainen,

earthquake and tectonic studies

The results of a fluid inclusion study of massive and disseminated ores from the Rauhala deposit, western Finland, show three different fluid inclusion types: (1) CO 2 -CH 4 (≤22 mol% CH 4 ), (2) CH 4 , (3) H 2 O (0.4-21 eq. wt.%NaCl), and an additional type-E (empty') inclusion. Fluid inclusion geothermobarometry shows that the ores were remobilized between 2.7-1.2 kb and 460-300 o C in a fluid environment varying from a saline (15-21 eq.wt.% NaCl) aqueous solution to a retrograde CH 4 fluid. Evolution of gaseous fluids is mainly attributed to metamorphic and deformational processes