| 下庄糜棱岩的40Ar/39Ar年龄及其成矿意义 |
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| 关键词:mylonite geological age Xiazhuang uranium orefield |
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| 40Ar/39Ar Ages of Xiazhuang Mylonite and Their Metallogenic Implications |
| According to the geological modes of occurrence, the mylonite in the Xiazhuang uranium orefield may be divided into two kinds, namely mylonite in the ductile shearing zone and that in silicic cataclastic rocks. The two kinds of maylonite have different cha-racteristics, which reflect different geneses and formation environments. The formation ages of mylonite are 140 Ma and 141 Ma (2 samples), colose to those of the peak stage of late 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 earlier granitic body which was in the pseudo-plastic condition again. The ductile deformation of rocks is closely associated with uranium mineralization both in space and time, and the ore-controlling factors are intimately related to the ore-forming mechanism and the ductile-shearing deformation mechanism.Such information is useful in the prospecting and exploration of early uranium mineralization. |
| LI Jianhong,LIANG Liang,WEI Shanyuan.2005.40Ar/39Ar Ages of Xiazhuang Mylonite and Their Metallogenic Implications[J].Acta Geoscientica Sinica,26(z1):244-247. |
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