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Studies on Geological-geochemical Characteristics of the Budunhua Copper Deposit in Xinganmeng, Inner Mongolia

Author: FengXiangFa
Tutor: RenLiuDong
School: Chinese Academy of Geological Sciences
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Geological and geochemical characteristics SHRIMP zircon ages Ore-forming fluids Buton of copper
CLC: P618.41
Type: Master's thesis
Year: 2010
Downloads: 148
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Abstract


Inner Xinganmeng Buton of copper in the middle Daxing'an southeastern edge of the area is an important one copper polymetallic metallogenic belt. The mine was built from 1970 to date has been mined ore to 70m elevation, although after years of mining exploitation, but metallogenic characteristics and metallogenic regularity little studied. In this paper, the geological characteristics and the geological conditions of the field, a detailed study of indoor work, try the metallogenic geological background, ore rock characteristics, deposit geology, geochemistry and genesis conduct a more in-depth explored in order to mine the deep and surrounding prediction and evaluation of blind orebodies lay a foundation. Thesis made the following understanding: a brief introduction of copper Buton regional tectonic features that EW and NE-trending structural control of the deposit of the intersections of the output, followed by construction of ore-grade construction, copper ore body are produced in the NE-trending structure in the secondary structure. Two comprehensive analysis of the deposit alteration types and sub-band feature, ore mineral assemblages and ore texture and structure characteristics, the study found altered rocks of the mine in addition to the typical porphyry alteration, there is its particularity, ie potassic zone and phyllic zone between the emergence of electric quartz alteration zone. 3 a detailed analysis of mining ore-related plagioclase porphyry, diorite intrusive bodies such as rock geochemistry, and mineralization pluton precise zircon SHRIMP dating of uranium and lead. The results show that the rock is alkaline type Ⅰ granite, rich in Mo, Sn, Cu, Pb, Zn, Ag and other trace elements, is likely to heat and source of ore mineralization; measured Buton of copper mineralization SHRIMP age 152.6Ma pluton is the region's first precise determination of the age of the rock, should be used as a large number of large-scale presence in eastern China Jurassic porphyry and porphyry - skarn copper-molybdenum mine second stage of the Late Jurassic - Early Cretaceous porphyry - skarn copper-molybdenum mine a useful complement. 4 field visits found orebodies mainly developed Lower Permian has good porosity in the fine-grained sandstone, siltstone, its trace element analysis showed that, Cu, Zn, Pb, Ag, Sn are in metamorphic siltstone different degrees of enrichment. Analysts believe that the sandstone itself has good porosity and fissures through resistance, under the action of hydrothermal circulation, formation itself can provide a mineral; hydrothermal circulation in the latter system, but also conducive to bring out the elements , so as to provide partial or substantial mineralization mineral, under favorable conditions in the structure, but also for mine ore fluid to provide the necessary space. 5 pairs of copper deposit Buton main mineralization stage quartz veins in a system of fluid inclusions inclusions petrography and microthermometry studies. The results show that the homogenization temperature range at 100 ~ 470 ℃, salinity range at 3.39% ~ 66.75%, fluid inclusions in quartz-rich, mostly distribution of population distribution, the rich liquid, gas, and a salt crystal ( daughter minerals) phase-type inclusions widespread. Inclusions gas-liquid ratio changes, from 3% to 95%, lower than the gas-liquid ratio and high gas-liquid inclusions coexist, low salinity and high salinity inclusions coexist more common phenomenon. Further from the temperature, salinity histogram can be seen, the temperature, the salinity is not only a wide range, and has a number of peaks, indicating that the multi-stage mineralization. 6 Consolidated above, initial analysis showed that the mine is the Lower Permian strata forming the material basis, while Yanshanian magmatic mineralization crucial role. Mineralization type should belong porphyry.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Non-ferrous metals > Copper
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