安徽宣城茶亭銅金礦區(qū)巖漿巖特征及成因
[Abstract]:In recent years, the newly discovered scale of Chating area in Xuancheng, Anhui Province, is expected to be large-super-porphyry copper-gold deposit. On the basis of systematically collecting the previous research data and synthesizing the latest exploration results in the mining area, this paper combines the indoor petrography, zircon U-Pb isotopic geochronology and main trace elements through the regional geological survey and the cataloguing of the borehole cores in the mining area. The geological and geochemical characteristics of magmatic rocks in the Chating copper and gold deposit area have been preliminarily determined by the studies of rare earth elements, zircon HF isotopes and Sr-Nd-Pb isotopes of whole rocks and plagioclase monomorphic minerals. The source of diagenetic material and diagenesis mechanism of magmatic rocks in mining area are discussed. The main knowledge and results obtained are as follows: 1. The volcanic rocks in the Chating copper and gold deposit area of Xuancheng are mostly covered by Quaternary surface sediments. The main rock types are crystalline lithic tuff and hornblende andesite, which show the characteristics of low alkali, low sodium, rich potassium and low titanium, etc. The magmatic intrusions are located under the regional volcanic strata, and the main rock types are intermediate-acid quartz diorite porphyrite, which is the main ore-bearing rock and diorite-porphyrite in the copper deposit of Chatiing. The diorite lamprophyre is cut in the form of veins. The chemical composition of intrusive rocks shows the characteristics of rich alkali, rich sodium and low titanium. The LA-ICP MS zircon U-Pb age of the intrusive rocks in the Xuancheng Chatiing area is 137.8 鹵1.3 Ma for quartz diorite porphyrite, 135.9 鹵1.2 Mafor for diorite porphyrite and 138.0 鹵1.3 Mafor for dioric lamprophyre, indicating that the intrusive rocks were diagenetic in early Cretaceous. The U-Pb ages of crystalline tuff and hornblende andesite are 130.2 鹵1.2Ma and 132.2 鹵1.6 Ma, respectively, indicating that the volcanic rocks are the product of magmatic eruption in the same period. The diagenetic age of volcanic rocks in the area is early Cretaceous. 3. The ore-bearing diorite porphyrite in Xuancheng Chatiing mine is rich in light rare earth elements and large ion lithophile elements, and is depleted of high field strength elements. The zircon HF isotopic composition and the Sr-Nd-Pb isotopic composition of the whole rock and plagioclase are between the lower crust and the enriched mantle, indicating that the magmatic rocks in the Chatiing mining area have the characteristics of crust-mantle mixing. It is found by comparison that the geochemical characteristics mentioned above are similar to those of intrusive rocks in faulted uplift areas such as Tongling ore concentration area, and are similar to those in Ningwu area. There are some differences in intrusive rocks in Luzong and other fault-depression areas. By comparing with other magmatic rocks in the tectonic-magma metallogenic belt of the middle and lower reaches of the Yangtze River, it is found that the ore-bearing diorite porphyrite was not only in the diagenetic epoch. Moreover, the diagenetic mechanism and diagenetic structure background are consistent with the intrusive rocks in Tongling ore concentration area, that is, the intermediate-acid intrusive magma of the ore area originated from the melting and upwelling of the enriched lithospheric mantle and caused partial melting of the lower crust material. Magmatism occurred in the tectonic setting of regional tectonic stress transition from compression to extension. In addition, the volcanic rocks developed in comparison with those developed in Ningwu, Luzong and other areas can be found to be basically the same diagenetic age, all of which are about 130Ma, and their geochemical characteristics are similar. Therefore, the intrusive rocks developed in the Chating copper-gold deposit area are consistent with the intrusive rocks in Tongling ore concentration area, while the geological and geochemical characteristics of volcanic rocks are consistent with those developed in Ningwu and Luzong ore concentration areas, and no mineralization has been observed. The geological and geochemical characteristics and genetic mechanism of the ore-bearing diorite porphyrite are consistent with the intrusive rocks in Tongling ore concentration area, which also indicate the similarity of metallogenic specificity.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P618.41;P618.51
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