Geological And Geochemical Characteristics And Genesis Of The Zhalageamu Copper Deposit,Inner Mongolia

The Zhalageamu copper deposit located in the North East edge of the Xilinhaote block,and the north side is the two Lian-hegen ophiolitic melange belt,and the north is adjacent to the southeast edge of the Siberia plate.The tectonic location of the region belongs to the late Paleozoic continental margin of the Xiwuqi of the Xilinhaote volcano type passive continental margin,Baoyintu of the northern continental margin of the North China plate,The deposit is a hydrothermal copper deposit with a copper deposit of about 112 thousand and 700 tons.Based on the study of geological features of the deposit,the main elements,trace elements,rare earth elements and stable isotopes of the rock(ore)body of the deposit are systematically analyzed,and the main achievements and knowledge are summarized as follows.(1)Through the study of hydrogen and oxygen stable isotopes,the ore-forming fluid is evolved from early magmatic hydrothermal fluid to late magmatic hydrothermal fluid and atmospheric precipitation hydrothermal fluid;carbon and oxygen stable isotopes indicate that the ore-forming fluid in the Zhalageamu copper deposit has the characteristics of the mantle source;and was mixed with atmospheric precipitation in the late stage of mineralization.(2)The study on the stable isotopes of sulphur and lead shows that the distribution of the sulphur isotope composition shows the characteristic of the tower distribution,and the sulfur is mainly derived from the deep source magma.The small variation range of ²⁰⁶Pb/²⁰⁴Pb of metal sulfide shows that the lead isotope composition is very stable,indicating that the lead in the ore has roughly the same source and evolution history.According to the diagram of the??-??of plumbum,the plumbum of the Zhalageamu copperfrom the upper crust material and is mixed with the mantle material.(3)The trace element content in the ore samples of the Zhalageamu copper deposit is roughly equivalent to the trace elements of the rock and stratigraphic samples in the mining area.According to the distribution pattern of trace elements in ore samples,it is concluded that the rock in the Zhalageamu copper deposit may provide some ore-forming materials in the mineralization process.(4)Magmatic rocks and ores have similar REE distribution curves,and the deposit are relatively enriched with LREE and HREE.The REE curves have negative europium(Eu)anomaly shows that the Zhalageamu copper deposit is related to magmatic process.