A Research About The Metallogenic Characteristics Of Sanshan Lead-zinc Polymetallic Ore Belt In Lanping

Lanping basin which is located in the West of Yunnan province is abundance in Pb,Zn,Cu,Ag.Sanshan oreforming belt and the famous Jinding lead-zinc deposit are all located in the middle axial tectonic belt of lanping basin.So,Sanshan oreforming belt is an important spot which may contain a mass of Ag-Cu-Pb-Zn resource and is valuable for geologist to research.The ore body of Sanshan lead-zinc polymetallic ore belt can be divided into at least two different types, the first type of ore body is vein like, which produced in the Huachangshan fault is strictly controlled by the fault.The main ore-forming elements of the ore body is Ag, Cu, associated with Pb, Zn; The second type is stratiform and lenticular like that it is occurs in the Upper Triassic limestone of Sanhedong Formation and the main ore-forming elements of it is Pb, Zn, Ag, Cu.Electron microprobe analysis showed that the main ore forming elements of Sanshan ore belt are Zn, Pb,Cu,Ag associated with Fe, Au, Mo, Co and other ore-forming elements.The main metal minerals are sphalerite, galena and Pyrite in which Zn, Pb, Cu, Fe form as isomorphism and Au, Mo, Ag, Co form as fine particulate. The composition and constructure of Sphalerite, pyrite and galena in Sanshan ore belt have proved that they may subject to Deposition-Reconstruction.Sulfur isotope of Sanshan lead-zinc polymetallic ore belt may be derived from seawater sulfate and may be mixed with mantle. Carbon, hydrogen and oxygen isotopes may be derived from marine hydrochloride. REE fractionation of Sanshan polymetallic lead-zinc ore belt is obvious that light REE is enriched.δCe andδEu is negative anomaly.