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Description And Origin Of Carbonate Minerals In The Upper And Lower Cherty Members Of The Biwabik Formation, Minnesota, Leslie R. Honeyman
Description And Origin Of Carbonate Minerals In The Upper And Lower Cherty Members Of The Biwabik Formation, Minnesota, Leslie R. Honeyman
Theses and Dissertations
This study was done for the Erie Hining Company after periodic problems with the quality of pellets from taconit2 of the Biwabik Formation had been linked to the presence of carbonate minerals. The carbonates found in the cherty members of the Precambrian Biwabik Formation are predominantly siderite, ankerite, and calcite. Siderite is the only primary carbonate mineral and occurs in three forms: nicrogranular, granular (oolitic), and crystalline aggregates (recrystallized). Ankerite is a secondary mineral occurring as crystalline aggregates and alteration rims on granular siderite. Calcite is found only in fractures and fault zones. Siderite formed from the original precipitate and …