Abstract
Based upon geological and geochemical data on the genesis of Gongchangling rich magnetite deposit, it is suggested that the deposit is of multi-genesis, and a three-stage geochemical model for the genesis of the deposit is proposed: (1) Sedimentary stage: the deposition of BIF (magnetite-quartzite) was accompanied by high-grade magnetite (hematite)-siderite ores which are intercalated with magnetite-quartzites as lenses or stratoid shoots. (2) Metamorphic stage: in response to metamorphism, siderite, was decomposed into magnetite and graphite with decreasing fO 2 and increasingP CO 2. In the marginal parts of magnetite-siderite ores or within the thin-layered interbeds where fO 2 was high relative toP CO 2 were formed graphite-free rich magnetite ores. (3) Hydrothermal stage: as a result of later hydrothermal process diffusive metasomatism between the rich ores and the host rocks and silica leaching took place, thus giving rise to the rich magnetite ore of metasomatic type and altered rocks.
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