GEOCHEMICAL CHARACTERISTICS AND MINERALIZATION OF TONGSHANLING GRANO—DIORITE, HUNAN

The Tongshanling grano—diorite porphyry body is situated in the southwestern part of the Gangui Diwa System, SE Diwa Region, China. It is a calc—alkali igneous rock produced in the mat—mobity period of the Diwa stage and derived from the mantle and then assimilated partly crust's material.According to the study of the chemical composition of silicates, Composition and content of trace elements in the igneous rock and mineralization-alteration aureole, composition and content of trace elements of pirite、biotite、auerbachite and magnesian chromite in the igneous and ores, composition of sulphur-isotope in sulphide ores in the Tongshanling Region, conclusion can be drawn as follows:1 The Tongshanling grano-diorite porphyry is similar with igneous rocks in the SE Diwa Region producing the porphyry Copper deposits in geochemical character, and therefore is a favorable igneous rocks in searching for porphyry Copper deposits.2、The grano-diorite porphyry, which was derived from the mantle, and which partly assimilated crust's material in it, is a ealc-alkali igneous rock. The igneous rock is favorable for searching for Cu. Pb. Zn、Ag and Me. The magmatism of the Tongshanling grano-diorite porphyry is in close ralationship with the mineralization of the ore deposits in origin. When magma migrate up, magmatie water and ore-forming material are released and ore-bearing magmatie hydrothermal solution is formed as pressure decline.3、The silication-illitehydromieation and skarns alteration mineralization aureole are formed since alkaline hot sulution containing CuPb、Zn、Ag、Me and K、SiO_2 reworked Tongshanling grano-diorite porphyry in oxidizable environment: and were superimposed on it.