Based on geological features, the mylonite at the Xiazhuang uranium ore field may be divided into two types, namely mylonite in ductile shear zone and mylonite in silicic cataclastic rocks. The first of these basically results from single shear strain, while the second formed mainly as a result of pure shearing strain. The two types of mylonite are different in characteristics such as their petrofabric diagram, strain parameters and dynamic vorticity number. The main ductile-shearing zones at the uranium ore district have been recognized as reverse faults. The formation ages of mylonite have been obtained as 140 Ma and 141 Ma (2 samples), close to those of the peak stage of later granitic magmatic activity, and identical to those of the early uranium mineralization. It is suggested that ductile-shearing zones in the area originated from the deformation of an earlier granitic body in a pseudoplastic state. The ductile deformation is closely associated with uranium ore-formation both in space and time, and ore-controlling factors are intimately related to ore-formation mechanism and mechanism of ductile shearing. Such information is useful in the prospecting and exploration for uranium mineralization in this region.
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- Features of mylonite and its relationship to uranium ore-formation in the Xiazhuang uranium ore field
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