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| Citation: | Chen Bailin, Gao Yun, Shen Jinghui, Zeng Guangqian, 2022. Analysis of Ore-Controlling Structure of Changjiang Uranium Ore Field, Northern Guangdong. Earth Science, 47(1): 159-177. doi: 10.3799/dqkx.2021.048
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The study of ore-controlling structures is still weak in the Changjiang uranium ore field, which has restricted the understanding of metallogenic regularity and future prospecting direction. Through detailed analysis of ore-controlling structure in ore field, the authors determined the ore-controlling structure form, constructed a structural ore-controlling model, discussed the evolution of ore-controlling structure, and pointed out the prospecting direction in this study.It is found that uranium ore bodies and mineralization belts in the ore field are controlled by NNW-trending (near SN-trending) fault structure and are characterized by a long strike extension, a large dip depth, a stable occurrence with some arcuate shape and belted groups, which indicates that the ore-bearing structures are compressive or/and compresso-shear fault (closely spaced joint or/and cleavage belt) forming under an EW-trending compressive stress field. However, the ore controlling structure in the ore field is a larger scale NNW-trending (near SN-trending) fault structure system (or main fault), in which deep part links the ore-forming solution in depth and acts as passage-way for the ore fluid and shallow part links the ore-bearing NNW-trending (near SN-trending) fault structures. They not only act as the host space but also control the occurrence of ore-bodies. The ore-controlling structure went through five stages as forming stage of ore-bearing structure, emplacement stage of basic dike, metallogenic stage, forming stage of brittle fracture after mineralization and uplifted-exhumation stage, finally appearing the present state. The Youdong fault is not a high degree ore-controlling structure, it only acts as ore-bearing structure. The Mianhuakeng fault maybe occurred after mineralization. On the basis of the ore-controlling structure, the further prospecting for uranium deposits should be along the NNW-trending (near SN-trending) fault belt, concentrated in the strike extending area and deep dipping area. In the meantime, there is a good chance for concealed ore zone in the blank area between existing ore zone at surface and shallow part.
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