Keywords: 
• tectonic -sedimentary evolution /
• mineralization /
• Paleogene /
• Lanping Basin

Abstract: The Mesozoic and Cenozoic basin of Lanping attracts more and more attention because of its accumulation of large amounts of metal deposits. This paper take Paleogene infilling sequence in the basin as the research object, adopt clastic composition, geochemical means to study the evolution of Lanping Paleogene basin, to further explore the relationship between Paleogene each evolution stage and mineralization in Lanping Basin, for the next step prospecting direction. The results show that Lanping Basin occur deformation due to the slow uplift of the Yangtze continent in Paleocene- Early Eocene(E₁-E₂¹), thus formed nearly north and south trending long and narrow type extrusion depression basin, on the whole the basin formed East steep and west slope, shallow in the east and deep in the west, sediment grain size coarsening upward gradually, showed the water upward shallowing and lake gradually atrophy.Because of the stage of the extrusion depression, it's relatively stable. Lanping Basin both east and west sides of orogenic belt to the basin hinterland strong thrust propagation because of the Himalayan movement in Late Eocene- Oligocene(E₂²-E₃), formed pattern of the wedge nappe and sedimentary basin to further narrow, most areas of extrusion fold and with some degree of difference uplift, caused only residual sedimentary record intermontane basin in the north of Lanping Basin, the southern and central part of basin is mostly uplift and develop into denudation area. Most area of Lanping Basin inversion mountain, only in the nappe front residual intermontane basin, basin filling by molasse conglomerate of Baoxiangsi Formation and Jinsichang Formation in the Eocene-Oligocene, this period is Lanping Basin bidirectional thrust nappe most intensely active period. On the results of previous studies on the Lanping Basin metallogenic rule discovery that ore-forming and tectonic-sedimentary evolution of Lanping Basin with good coupled. Basin sedimentary rocks-hosted base metal deposit ore emplacement is closely related to the internal deformation of the basin, which controlled by Indian - Asian continental collision and extrusion, Yangtze paleocontinent and Yunnan-Tibet ancient mosaic and collision. According to the basin Paleogene infilling sequence characteristics and substance accumulation rules, thinking that the Paleogene Lanping Basin under the compressional tectonic background, forming the ore-control structures are extruded and depression - fold structure, mass region extrusion strike-slip structure. These structural deformation can be ore structures, can also be a guide ore structure. The Paleogene tectonic and sedimentary evolution of the Lanping Basin can be further divided into two stages: The first stage is squeeze-depression of the Paleocene - early Eocene, the second stage is the extrusion strike-slip stage of late Eocene-Oligocene.In the early stage of the extrusion and depression(65~41 Ma), formed vein Cu deposit and Fulongchang vein Cu-Ag-Pb-Zn (48~49 Ma) deposit of the Lanping Basin western depression fold nappe belt. Ore was only intermittent veinlike due to the space constraints of ore. In the late extrusion strike-slip stage (40~26 Ma), the edge of the basin to the side basin hinterland produce nappe movement and one side along the boundary fault strike slip movement. Formed large-scale east and west nappe. When the nappe advance to the deposition of gypsum salt built, gravity pressure and density inversion makes salt diapir rise form the dome structure, Thus formed Hexi-Sanshan Pb-Zn (-Ag-Sr) deposits and Jinding super large Pb-Zn (-34 Ma) deposits of the Lanping Basin Eastern thrust nappe belt.