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- W2014753923 abstract "Abstract The early Proterozoic iron formation of the Luliangshan region is 18 km long and has undergone different degrees of metamorphism at different localities. Within this belt, the Yuanjiacun deposit is characterized by low grade metamorphism, diverse iron sedimentation facies, a well-exposed stratigraphic section and simple structure. It is an ideal case for studying the depositional environment and the metamorphic processes of Precambrian banded iron ores. Formed in a shallow water basin of a geosyncline, the Yuanjiacun iron formation some 1200 m thick comprises three sedimentation-ore formation cycles, each of which begins with coarse- to medium-grained clastic rocks (quartz sandstone or arkose), passes through fine-grained siltstone and argillitic rocks, and grades into pure colloidal chemical deposits represented by thin-bedded ferruginous quartzites. In each cycle from the bottom upwards, in general, there successively occur pyrite, siderite, iron silicates (including Fe-rich chlorite, minnesotaite and stilpnomelane), magnetite and haematite. These iron mineral facies are products of sedimentation and diagenesis to very low grade metamorphism stages. The spatial distribution of iron facies in stratigraphic sequence shows an increasing oxygen fugacity of the depositional environment during the course of each cycle. The main factors controlling the types of iron sedimentation facies and the valence state of iron are considered to be the proportion of sandy-argillitic component to colloidal chemical materials during deposition and the relative amount of organic matter in them. The abundance of organic matter results in the creation of a reducing environment and the formation of principally ferrous facies, whereas the lack of organic matter leads to the development of oxidizing conditions and the formation of ferric facies. Under a transitional oxidation-reduction medium, mixed ferrous-ferric facies dominate. The fracture-related regional metamorphism yielded progressive metamorphic zonation in the Luliangshan region: the chlorite zone and the biotite zone of greenschist facies, and the almandite zone, staurolite zone and kyanite zone of the amphibolite facies. These metamorphic zones cross-cut banded iron ores and produce corresponding changes in the iron formation." @default.
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- W2014753923 date "1988-05-01" @default.
- W2014753923 modified "2023-10-12" @default.
- W2014753923 title "Depositional environment and metamorphism of early Proterozoic iron formation in the Lüliangshan region, Shanxi Province, China" @default.
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- W2014753923 doi "https://doi.org/10.1016/0301-9268(88)90049-6" @default.
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