Abstract:

According to study on geological and geochemical characteristics of Dongshengmiao polymetallic deposit, in Urad Back Banner of Inner Mongolia，it was shown that there are many differences between S-rich and Zn-rich ore bodies from ore-body shapes, ore mineral assemblages, ore textures and structures, wall rock alterations to REE distribution patterns. The metallogeny of this deposit can be distinguished into two stages: the first one is a sedimentary exhalative process which contributed to S-rich ore-bodies; the second one is a low-temperature hydrothermal reconstructed process after regional metamorphism and wall rock deformation, which contributed to Zn-rich ore bodies. There are two favorable factors for zinc-rich ore formation, i.e. lithological assemblage of ore hosting strata from multiple sulfur-rich layers, clasolites to dolomitic-marble from top to bottom and low-temperature hydrothermal activities after sulfur-rich ore precipitation. The more reconstructed Cu, Zn and Pb ore bodies may be found in the deep below ore bodies or polymetallic strata in the deposit or in the Langshan-Zhaertai ore belt.

Key words: Dongshengmiao polymetallic ore deposit of Inner Mongolia, geological characteristics, deposit genesis, sedimentary exhalative process, deep ore prospecting