The Tectonic Deformation Characteristics And Ore-controlling Model Of Yuele Lead-Zinc Deposit In Northeast Yunnan

Taking the tectonic mineralization theory as guidance, a large number of geological survey, prospecting works, geological record and features of tectonic-geochemistry in the YueLe Lead-Zinc deposit is carried out. Combinating with the regional tectonic evolution and analysising comparatively on the adjacent Pb-Zn deposits, it is founded out that the geological characteristics and controling factors of ore bodies, and the tectonic deformation characteristics and dynamics mechanism in Yuele ore field. The tectonic-controlled ore-forming model is established, and metallogenic regularities is summaried in this paper. And then, the metallogenic prediction target area is put forward. The thesis mainly have the following research results and knowledge:1. YueLe Pb-Zn deposit belongs to a mesothermal-epithermal filling and metasomatic nervation type Lead-Zinc deposit.2. The tectonic case wearing for:The deposit in the main structure line is nearly SN, the backbone fold shaft is NW-brachydiagonal Longjinguo Fold, with NE,NEE to subprime folds and NWW, NW, NNW, NE, NEE to faults and layer fault zone. Overall present grid shape structure pattern.3. The deposit’s tectonic stress field characteristics is:According to the order of the fault activity and inform The experience at least four periods of tectonic stress, Indosinian orogeny NNW-SSE to Extend stress, Yanshanian movement NE-SW to compressive stress, Early stage of Himalayan orogeny NW-SE to compressive stress and late stage of Himalayan orogeny to the main of the fault walk right slide shear stress.4. Tectonic deformation characteristics research shows that, the tectonic movement phase four times at least experience tectonic deformation sequence:Indosinian orogeny to the nearly SN fault,for the first tectonic deformation; Yanshanian orogenic form to drape the NW fold, for the second phase of the tectonic deformation; Early stage of Himalayan form to drape the NE fold and NW fault, for the third phase of the tectonic deformation; Late stage of Himalayan form to NNW strike-slip fault subprime fault and fault zone between the layers, for the fourth tectonic deformation. YueLe Pb-Zn deposit is maybe Middle-late stage of Yanshanian orogenic and Early stage of Himalayan hydrothermal activity’s product.5. The features of tectonic-geochemistry research report, mineralization abnormal along the fault distribution has the character of:(1)Abnormality area of Shachi-xiaoyakou. Focus on F2fault and NEE Shachi-xiaoyakou anticline cut into place;(2) Abnormality area of Yuan-ping. Focus on F2fault and NW Longjinkou anticline cut into place;(3)Abnormality area of Xiongjiagou-zuojiaguo. Along to a NNW strip of F4fault-F9fault;(4) Abnormality area of Yinchangguo. Along to a NW strip of F3fault.6. The tectonic ore control mode:F1-F2fault zone for leading the ore structure; The subprime NW fault and NEE lateral fold to for ore matching structure, control the deposit formation; NNW stretching fault,lateral NE fracture and the shear fracture zone between the formations,control the output and the form of the ore bodies. At the same time,the limestone or dolostone of Ordovician Shizipu-Daqing formation and Silurian Huanggexi-Daluzhai formation is a good Ore-bearing stratum and provide necessary rock conditions.