| Dahongshan copper area locates in the Junction site of Gasa county, Laochang county and Xinhua in Xinping, Yunnan. It's well-known as high concentration of copper and iron resources. Though the yielding scale of Dahongshan copper is increasing, the mine has been gradually emerging resource crisis. Therefore, further strengthening the Dahongshan geochemical characteristics of copper deposits"in the study for further development of deep Dahongshan copper-edge and peripheral lay the foundation for the work of prospecting, it is extremely necessary and urgent.This paper has scientific research "Dahongshan Xinping County, Yunnan Copper Mine-edge and external ore project," Relying on the analysis of research data on the basis of their predecessors, after on-site geological survey, collecting rocks, minerals specimens and samples. Through the analysis of test samples and its integrated research, awareness and access to the following results:1. Constant element chemical characteristics. Ore zone with the constant element in the composition of rock, and there is no significant difference, indicating Dahongshan copper deposits of ore and rock formation with a similar or identical conditions and environment.2. Trace element geochemistry. Surrounding rock and the enrichment of ore bed containing the same elements, the latter Cu, Mn, Co relatively more enriched in trace elements shows that both types and combinations there consistency, but the enrichment of the order are not consistent, there may be environmental variability, subject to the results of the impact of diagenetic mineralization period, so that changes in the order of element enrichment.3. Rare earth elements geochemistry. The Red Hills of total rare earth ore-bearing rocks is generally low, SREE content of 47.4-281ppm, and markedly enriched light REE, LREE/HREE ratio is 1.17-9.18, Y family of rare earth content is relatively low, the relative content of rare earth cerium family high, are LREE-enriched type, the (La/Yb) ratios were> 1 (DT-5 is 0.91), ranging between 1.07-8.8.4.Isotope geochemistry. (1) Lead isotope:It Dahongshan copper bed 11 lead isotope data suggest that this lead is obviously different sources at differentμand (ω) the value of the environment in the evolution of the formation of mixed lead at different times. (2) sulfur isotopes:Dahongshan sulphide copper deposits of sulfur isotopic results show that the copper deposits of sulfide sulfur isotopic composition of-3.4-12.41‰, most of them positive. Dahongshan sulfur isotopic composition of iron ore and copper deposits of sulfur isotopes Dahongshan as a non-equilibrium formation of volcanic sulfur may also be two sources of sulfur and seawater mixture. (3), hydrogen and oxygen isotopes:From the get-type copper deposit Dahongshan 3 quartz, calcite, and a garnet one of d180 (SMOW), and dD data shows that the mineral d180 values between 9.12-13.48%, indicating that ore-forming hydro thermal there magmatic water, metamorphic water and meteoric water involved in movement, the more to the ore-forming role of precipitation in the more advanced significantly. (4) K/Ar isotopic age. From the existing K/Ar and the current obtained K/Ar isotopic age shows that on average mainly in 800Ma±20,530-590 Ma±20,300-366±7Ma, that K/Ar isotopic ages reflects " Dahongshan-style "post-metamorphic transformation of iron and copper deposits of the event, does not mean that the original rock isotopic ages, representing Jinning campaign period volcanism, metamorphism and uranium mineralization of the time, is a large copper deposit in the transformation of the Hongshan age.5. Benefit Analysis. According to metallogenic series point of view, using geographic information systems at different levels to predict a total of delineation of the ore-finding area 5. Of which:I grade ore-finding area 2, II grade ore-finding area 3. |
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