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Geology And Geochemistry Of The Anqing Copper Deposit In Anhui Province And Its Three-dimensional Geological Modeling

Posted on:2012-05-07Degree:MasterType:Thesis
Country:ChinaCandidate:F M XuFull Text:PDF
GTID:2120330332989021Subject:Deposit prospecting and exploration
Abstract/Summary:PDF Full Text Request
The Anqing area is an important segment of the Middle-lower Yangtze River Cu-Fe mineralization belt. In the area occur a great number of the Fe-Cu skarn deposits, of which the Anqing Cu-Fe deposit is a representative one with larger scale, higher grade and remarkable geological features. Geological investigation and microscopic observation combined with analyses of SHRIMP zircon U-Pb and major and rare earth elements have been carried out on the Anqing Cu-Fe deposit deposit, with a focus on the analysis of their origin. Additionally, the three-dimensional geological modeling of the Anqing copper deposit has been completed using Micromine, a three-dimensional software, with an analysis on the relationship among the ore body, strata, structure, and pluton.The following are major achievements obtained in this thesis.1. Field investigation results indicate that the skarns and associated ores are spatially distributed as zones. From carbonate wall rock to pluton occur in order marble, diopside skarn, diopside garnet skarn, garnet skarn, feldspar diopside skarn, diopside skarnized diorite and diorite.2. Geochemical data presented in this thesis are consistent with the formation of the diorite associated with Cu-Fe mineralization in Anqing deposit by fractional crystallization of crust-mantle syntactic magma. The SHRIMP zircon U-Pb dating results support occurrence of at least two periods of magmatism in the Mesozoic, the first at~139 Ma and the second at~123 Ma responsible for the formation of quartz diorite and diorite.3. The REE analyses indicate controlling of the skarn REE distribution pattern by the garnet REE distribution character, formation of the skarns under the condition of high temperature and oxidation, and derivation of the ore-forming fluid mainly from postmagmatic hydrothermal fluid.4.The three-dimensional visualization of perspective study leads to some significant results. Two distinct concealed buildups of magmatic rock are observed, and the ore bodies are mainly located in the south of No. 1 buildup. The ore bodies dip northeast, and a clear horizontal zoning occurs between the skarn and associated ores. The F1 fault is a normal fault and cuts the main ore body, resulting in division of it into two parts―No 1 and No 2 ore bodies. The major structure in the Anqing deposit occurs as an inversion anticline, with an eroded flip-wing and a normal wing as a shielding structure favorable for mineralization.
Keywords/Search Tags:Anqing copper, skarn, geochemistry, three-dimensional modeling
PDF Full Text Request
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