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Dongchuan, Yunnan Copper Mine tectonic evolution gabbro geochemical characteristics

Author: YiChengLi
Tutor: HuZuoZhao
School: Kunming University of Science and Technology
Course: Structural Geology
Keywords: Structural features Tectonic evolution Magmatism Geochemical characteristics Dongchuan copper mine Yunnan
CLC: P618.41
Type: Master's thesis
Year: 2010
Downloads: 141
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Abstract


Dongchuan copper mine Kunyang Group strata occur in the Middle Proterozoic large very large copper deposit. Complete the funding of this thesis is to succeed in the the nationwide crisis mines Resources Prospecting special \Dongchuan copper deposit Structural Control of Ore control rock interaction, magmatic and hydrothermal activities. In this paper, on the basis of the results of previous studies, focusing on analysis of the impact the fracture structure surface mechanical properties of the mine and the ore body, combined with the tectonic evolution of the central Yunnan Province and Kunyang rift restored tectonic deformation history of the mine; and application of the principles and methods of magmatic rock geochemistry, mafic gabbro rock type discrimination and tectonic setting discrimination mode. Comprehensive analysis by field observation and indoor access to the following understanding: (1) fracture within the mining area is well developed, the structure of various types of distinctive characteristics. Comprehensive regional tectonic development and fracture analysis of the structure of surface mechanical properties, mine structure divided into at least six groups of three; analysis and structural analysis through structural layer structure of the division, combined construction, and reconstruction of the history of the development of the structural system of the mine; quartz The calcite veins ESR dating data results show that the mine late transformation is still strong, active age of advanced shallow brittle faults are mainly concentrated in the 22.4-32.8Ma. (2) in the study area, with mineralization related to intrusive rocks mainly high titanium, alkali-rich alkaline gabbro class, full-alkali-Si02 diagram, all samples fall alkaline basalts within; gabbro rock class performance MORB-normalized spider diagram for the left part of the \characteristics of Nb / Ta lt; (0.42 ~~ 0.83), a characteristic similar to continental rift basalts, display board basalt; light and heavy rare earth elements fractionation obvious content ratio (LREE / HREE) in 3.40 and 4.31 between changes; samples have significant positive abnormal δEu This may be due to the deep source of magma upwelling occurs in a high oxidation state of surface magma differentiation and evolution caused. Intra-plate tectonic discrimination diagrams into basalt area, the consolidated regional geology and the results of previous studies, the gabbro class may form a continental rift extensional stage or initial rift stage. (3) to establish the structure and magma prospecting indicators of mine, and according to the geological conditions, combined with signs of tectonic geochemical and geophysical prospecting, prospecting targets delineated three predicted target area deep extension of the deep well and concealed ore body exists the possibility. The results of this study for copper and iron ore bodies and the concealed ore predict provide new ideas, new methods for reference, provides a theoretical basis to guide the work of regional prospecting and Next.

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