The Magmatic Geochemistry Features Of The Mineralization Concentration Area In Lanping Basin And The Study Of The Relationship Between Magmatic Rocks And Ore-Forming

Based on geological investigation in the mineralization concentration area and a lot of analytical data in the laboratory, this paper includes volcanic magmatic activity and magmatic distributing; the petrology, element geochemistry features of the magmatic rock series in different areas in Lanping basin; the relationship between magmatic activity and mineralization.The study covers regional stratigraphy, regional geological structures and their evolution; deep-large fracture system and building-moutain straps in the basin; distributing of mineralization concentration area and mineralazition characteristics of different metal fields; volcanic magmatic activity and magmatic distributing; the petrology, element geochemistry features of the magmatic rock series; the relationship between magmatic distributing and mineralization; the relationship between magmatic forming-age and mineralization; the relationship between magmatic form and mineralization; source of mineral materials, source of hydrothermal solution and source of mineralizing agent; transport forms of metal in the solution; the ore-forming geochemical mechanism, etc.It turns out as follows:(1) Lanping Basin formed in the linkup of the plates and it was propitious to form deep-large fracture. These instable transitional structural units can provide not only moving channels for rocks and mineral materials, but enrich materalias for ore-forming.(2) The relationship of magmatic movement of different areas in the basin is close, magamtic rocks of different ares have certain relation.(3) The ore-forming and magamatic activity have close relation in time and space, course of formation. Magamatic activity provides enrich mineral materials and energy for ore-forming.(4) Mineral materials came from the crust and the mantle. Ore-forming fluid, mineralizing agent, auxiliary aget came mainly from the mixing of deep-source bittern, formation water, palaeometeoric water.(5) When sinking Palaeometeoric water and rising deep-source solution mixed during their moving, their physicochemical condition was changed, which made ore-forming.