Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China

Table 4

Chemical reactions and , , and slope of chemical reactions at different temperature.

Chemical reactions	= 373 K		= 423 K		= 473 K		= 523 K
	(1) 3Fe + 2O2 = Fe3O4	−69.1		−59.9		−52.7		−46.8
(2) 2Fe3O4 + 1/2O2 = 3Fe2O3	−53.7		−45.7		−39.3		−34.2
(3) Fe + 1/2S2 = FeS		−37.9		−32.5		−28.3		−24.9
(4) FeS + 1/2S2 = FeS2		−25.0		−20.5		−16.9		−14.0
(5) 3FeS + 2O2 = Fe3O4 + 1/2S2	,
(6) 3FeS2 + 2O2 = Fe3O4 + 3S2	,
(7) 2FeS2 + 3/2O2 = Fe2O3 + 2S2	,
(8) 2Cu + 1/2O2 = Cu2O	−39.1		−33.6		−29.3		−25.9
(9) Cu2O + 1/2O2 = 2CuO	−29.6		−24.8		−20.8		−17.7
(10) 2Cu + 1/2S2 = Cu2S		−34.3		−29.7		−26.1		−23.2
(11) Cu2S + 1/2O2 = Cu2O + S2	,
(12) Cu2S + 1/2O2 = 2CuO + S2	,
(13) 2FeS + 5CuFeS2 + 4O2 = Cu5FeS4 + 2Fe3O4 + 4S2	,
(14) 3FeS + CuFeS2 + 2O2 = CuFeS2+ Fe3O4 + 3/2S2	,
(15) 3FeS2 + CuFeS2 + 2O2 = CuFeS2 + Fe3O4 + 3S2	,
(16) FeS2 + 5CuFeS2 + S2 = Cu5FeS4 + 5FeS2		−14.3		−12.7		−11.1		−8.6
(17) Cu2S + 2Fe3O4 + 1/2O2 = Cu2S + 3Fe2O3	−42.4		−40.8		−39.3		−34.2
(18) 2FeS2 + CuFeS2 + 3/2O2 = CuFeS2 + Fe2O3 + 2S2	,
(19) 2FeS2 + Cu5FeS4 + 3/2O2 = Cu5FeS4 + Fe2O3 + 2S2	,
(20) Cu2S + Fe2O3 + 1/2O2 = Cu2O + Fe2O3 + S2	,
(21) 3Cu5FeS4 + 2O2 = Cu2S + Fe3O4 + 9/4S2	,
(22) 5CuFeS2 + Fe2O3 + 15/4O2 = Cu5FeS4 + 7/2Fe2O3 +3S2	,
(23) 4S2 = S8		−8.2		−6.5		−5.1		−4.1