The Chemical Relation of Iron and Manganese in Sedimentary RocksIRON and manganese are frequent constituents of sedimentary rocks, in some .. is well seen in the Clinton formation and in the Tertiary iron - ore horizons of . pure ore, and very commonly this concentration takes place by a process of.iron ore was formed by chemical sedimentary processes,8.0 Chemical-sedimentary deposits - USGSDeposits related to non chemical-sedimentary processes are discussed in . The main ore minerals within the sedimentary rock-hosted iron deposits in . beds of banded iron-rich rock usually in volcanic-sedimentary sequences formed in.
iron ore was formed by chemical sedimentary processes