Study On Raman Spectrometric Characters Of Fluid Inclusions Of TongChang Porphyry Copper Deposit, Dexing County Of JiangXi Province, Under The Condition Of Non-common Temperature And Pressure

Tongchang porphyry copper deposit, located in Dexing county, Jiangxi provance of southeast china, is a major deposit of famous Dexing porphyry copper ore field, which is located in the exterior zone of the Circum-Pacific Metallogenetic Belt. It is one of ultra-large porphyry copper deposits in the world, containing over five million metric tons of copper, one hundred and twenty-eight thousand metric tons of molybdenum, eighteen million metric tons of associated sulphur, two hundred and fifteen metric tons of associated gold and one thousand, two hundred and seventy-nine metric tons of associated silver. All these metal reserves can be used. Geotectonically its location is on the southen margin of the eastward extension of the Jiangnan Anteclise in the Yangtze Meta-Platform. It lies near the hanging wall of the Northeast Jiangxi Deep Fracture Zone, and is controlled by the transforming belt between the Jiangnan anteclise and the Qingtang Depression. The occurrence of the Tongchang deposit is an inevitable result of metallogenesis under the specific structural and magmatic conditions in a specific geologic environment.Since Dexing porphyry copper ore field was discovered in 1950's,many geologicians had researched it early or late and worked out a lot of geological data. Quartz , Fluorite, Anhydrite and calcite had a lot of fluid inclusions, which were found in every ore-forming hydrothermal stages in Dexing porphyry copper ore field. The number of fluid inclusions was large, but their diameters were different, some were up to 40μm in size and some were less than 1μm. It was regretful that most of researchers didn't systematically study the characters, distributing of inclusions and their relation with ore , or they curtly mentioned of them. As to the book Dexing porphyry copper ore field, Zhuxun and other writers systematically studyed the characters of inclusions such as homogenization temperature, decrepitation temperature, the types of inclusions, Salinity and ore-forming pressure, but they had their deficiency. In the book, they only studyed the homogenization temperature and the decrepitation temperature of inclusions as an integer and didn't study and analyze them for ore-forming stages. Of cource, they didn't study the compound and other characters of single fluid inclusions, either.Founded by natural science fund project "Studies on Raman spectrometric characters of single fluid inclusion at the condition of non-common temperature and pressure"(No.40072031), the writer takes "Studies and its significance on Raman spectrometric characters of ore-forming fluid inclusions of TongChang porphyry copper deposit, Dexing county of JiangXi province, under the condition of non-commmon temperature and pressure" as his research topic of master thesis in order to study and summarize well the characters of fluid inclusions in porphyry copper deposits and promote the reconnaissance-exploration work of this kind of deposit. Taking quartz and calcite as host minerals and studying emphatically the characters of fluid inclusions at the condition of non-common temperature and pressure and combination of group analysis of inclusions and analysis of single inclusion with the study on synthetic fluid inclusions and natural fluid inclusions,this thesis expounds the ore-forming process , the transfer mechanism and the deposition mechanism of the porphyry copper deposit so as to guide the exploration of the ore deposit.After studying more than two years, the thesis has worked out the conclusions and the fruits as following: ⑴In ore and gangue minerals of the deposit were found a great deal of fluid inclusions, Mineralization was intimately related to the activity of ore-bearing hydrothermal fluid. Here, gas phase, liquid phase, gas-liquid phase, multi-phase with daughter minerals and multi-phase with CO2 liquid phase inclusions of various types were distinguished. This indicated that the ore-forming fluid evolved from high temperature to high-moderate temperature, moderatelow temperature, low temperature.