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The Lower Palaeozoic system is a series of iron-bearing rocks consisting mainly of shallowsea-facies carbonates.On the basis of microfacies analysis of the carbonate rocks,the Lower Pa-laeozoic sedimentary sea basin is divided into two broad sedimentary-tectonic regions of foursedimentary facies and eight subfacies.The original iron-rich carbonates were deposited in salt-lakes,lagoons,etc.of the restricted basins.Over the long geological history,the original ironformations were reconstructed to various extents by late tectonic processes.Geological obser-vations and studies on the equilibrium mechanism of oxygen/sulfur isotopic fractionation and thecomposition and temperature of fluid inclusions in the minerals indicate that thermal brines play-ed an important role in reworking of the original iron-rich carbonate rocks,which led to the for-mation of sedimentary-reworked strata-bound ore deposit.
The Lower Palaeozoic system is a series of iron-bearing rocks consisting mainly of shallowsea-facies carbonates. On the basis of microfacies analysis of the carbonate rocks, the Lower Pa-laeozoic sedimentary sea basin is divided into two broad sedimentary-tectonic regions of foursedimentary facies and eight subfacies. The original iron-rich carbonates were deposited in salt-lakes, lagoons, etc. of the restricted basins. Over the long geological history, the original iron informations were reconstructed to various extents by late tectonic processes. Geological observers and studies on the equilibrium mechanism of oxygen / sulfur isotopic fractionation and thecomposition and temperature of fluid inclusions in the minerals indicate that thermal brines play-ed an important role in reworking of the original iron-rich carbonate rocks, which led to the for-mation of sedimentary-reworked strata-bound ore deposit.