| Sponsored by the national project for crisis mine named"Study on metallogenic regularity of strata bound type polymetallic ore deposit in Southwest China"etc, on the basis of Geochemistry and Electron Probe Microscopic Analyzer (EPMA), this thesis studies on the Petrochemistry and Ore mineralogy characteristics in the Liuju copper deposit. The main understanding and conclusions are as follows:1. Based on the method combining Cu-S system phase diagram with EPMA, It drew the estimation that the ore-forming temperature is about 72±3℃—103.5±0.5℃. It is reflect that the deposit is mainly formed in sedimentary-diagenetic period by the low-temperature hydrothermal metasomatism.2. It is the first time to describe djurleite in this area.3. Geochemistry characteristics of K2ml1 and K2ml2 show that, the chalcophile elements Mo, Cd, As, Cu, Ag and Hg enriched in the sandstone, it have the characteristics of ore source bed. From the copper ore to gray sandstone, to purple sandstone, with the average values of Cu reduced,î–˜EE and high field strength elements (Nb,Zr,Hf,Th) increased gradually. Trace elements in grey sandstone are remarkable different from purple one. It indicates that the copper ore formed by water-rock interaction and are closely related with hydrothermal activity.4. The chalcocite not only exists in grey sandstone, but also in grey-purple. The sandstone get reddening by oxidation, and Cu2+ migration happening.5. It sums up some rules on horizontal zoning of ore mineral association and zoning of element association in ore body:In the eastern part of ore body, the mineral association is tennantite, galenite, pyrite and sphalerite, and element association is Cu-Pb-Zn-Sb-Hg; In the middle of ore body, the mineral association is hematite, chalcocite and bornite, and element association is Cu-Ag-Sb-Hg. The sequence of mineral metasomatic evolution is pyriteâ†'chalcopyriteâ†'borniteâ†'chalcociteâ†'hematite. This rule provides a basis for metallogenic theory... |
PDF Full Text Request