Northeast Yunnan Lead-zinc Mine To Please Stratigraphic Geochemistry And Ore-controlling Role Of Research

DaGuan YueLe lead-zinc mine in ZhaoTong,Yunnan province is a promising mining area. Its main stratum is Paleozoic, sedimentary environment is from Marine deposits�'mainland to Marine deposits�'Marine deposits, and orebody are mainly controlled by the strata of carbonatite and fracture.In order to find out that the Controllability of Paleozoic strata of DaGuan YueLe lead-zinc mine to the lead-zinc mineralize, we select two representative profiles to study The details of strata, lithology, structure and mineral combination systematically. Based on this,we Carry out the research of the Constant element、Trace Elements and REE elements in ore enrichment stratum, Trying to use the systematic geochemical method to find the relationship between the ore enrichment stratum and controlling of ore-forming. Through two years field geological survey and indoor comprehensive research,we obtained the harvest1.According to the field investigation and measured sections,we resured the Paleozoic strata n DaGuan YueLe lead-zinc mine dstrict.We make vertical and horizontal comparison study of Paleozoic Ordovician-Devonian lithologic characteristics of DaGuan YueLe,And each group spatial distribution of lithology has done some analysis, which comprehensive study of lithofacies geochemistry and ore-controlling effect of the area has some reference.2.To study Constant elemen、Trace Elements and REE elements of two Paleozoic-devonian strata profiles in diggings,we get the following harvests:①Constant element geochemical analysis shows that, In the area, the average contents of samples of CaO and MgO in ore enrichment stratum are higher than the dead ground;the average contents of Na2O K2O and less than the dead ground;through the m=100×(MgO)/(Al2O3),we can calculate and analysis the sedimentary environment during the Ordovician-Devonian are Marine deposits�'Marine deposits to mainland�'Marine deposits. Using the ancient climate discriminant index ω(MgO)/ω (CaO) ratio, we can know that period during the Ordovician-Devonian is wet�'drought--moist environment.②Trace element geochemical analysis shows that, the average contents of samples of chalcophile elements (Pb、Ga、In) and petrogenetic elements (La、Li、Ba、Th) are higher,and it has brilliant indicating for mineralizing; transition elements (Cr、Co、Ni、Mo、Mn) in ore enrichment stratum are lower;the Amphotere in ore enrichment stratum have major fluctuations,hence they are not have indication for mineralizing; So there are enriching lithophile element, element and close sulfur elements in ore enrichment stratum. Use Sr/Ba judgment in the study area, we can calculate and analysis the sedimentary environment during the Ordovician-Devonian are Marine deposits�'Marine deposits to mainland�'Marine deposits, the results are the same to the Constant element;Use Ni/Co analyze,we can know the ancient oxygen are rich oxygen�'poor oxygen-rich oxygen environment.③’Ree element geochemical analysis shows that the curve in Lower Siluric and upper Ordovician are shaped reverse、steep and tilt "V",and means "Eu" enriching.The feature of Ree element in ore enrichment stratum are poor total Ree contents and light Ree contents, relatively enriching heavy Ree contents and enrichment "Eu".3. Through to study the geochemical characteristics and the rock geochemistry of ore enrichment stratum in DaGuan YueLe lead-zinc mine, which shows that the output of the ore body might be controlled by strata and proved the main ore enrichment stratum are the Lower Siluric(HuangGeXi group) and upper Ordovician(DaQing group).4. The components of the rock and ore-forming elements have obvious correlation, through the research,we found that the host rock are mainly Dolomitic dolomite (limestone)and aleurolite,some of the lead-zinc mine are controlled by stratum Lithology.