安徽東至兆吉口鉛鋅礦床巖漿巖及斷裂構(gòu)造研究
[Abstract]:East to Zhaojikou Pb-Zn deposit is a new Pb-Zn polymetallic deposit discovered in the south of Anhui Province in recent years. The accumulative amount of Pb-Zn resources has reached more than 500000 tons and is expected to be further expanded. This paper focuses on the study of magmatic rock and fault structure of the deposit through field geological investigation and drilling core observation in Zhaojikou area. Firstly, the appropriate samples of magmatic rocks are selected, combined with petrography, geochemistry, isotopic analysis and age determination, to determine the types of rocks, the source of diagenetic material, the diagenetic tectonic environment, and to discuss the controlling factors of magmatic activity on the mineralization. Secondly, the samples of fault gouge produced by fault activity are selected for K-Ar isotopic chronology analysis, and the time limit of tectonic movement is determined, combined with the geological characteristics and stress field analysis of fault structures in the regional tectonic evolution area. The influence of fault structure on mineralization is discussed, and the key factors of ore-forming and ore-controlling are determined. The results are as follows: granodiorite, granodiorite and diorite-porphyrite are the main intrusive rocks in the area. The intrusive rocks generally belong to peraluminous calc-alkaline series rocks with shallow emplacement. Granodiorite porphyry and granodiorite magma may be dominated by crust-derived magma and mixed with mantle-derived magma, while diorite-porphyrite magma is dominated by crust-mantle mixed magma. The intrusive rocks experienced distinct separation and crystallization and magmatism occurred in the geodynamic background of the transition from compression and compression to tension. There are two stages of magmatic activity in the area. The age of formation of granodiorite porphyry and granodiorite porphyry is about 145Ma, while diorite porphyrite is formed at 129Ma. The geological facts of diorite porphyrite and ore-bearing vein perforation indicate that the magmatism in this period is closely related to the mineralization of lead-zinc deposits in the area. A large number of inherited zircon cores are developed in the intrusive rocks in this area, indicating that a large number of crustal materials are involved in the diagenetic material of magmatic rocks. The inherited zircon isotopic age is 740U 890 Ma, which is consistent with the age of Neoproterozoic granite and Neoproterozoic Qingbakou Puling formation andshan basalt and andesite in southern Anhui. The tectonic-magmatic events between the Cathaysian plate and Yangtze plate in Jinning period were revealed. The zircon age of more than 1000 Ma indicates that there may be Gu Yuan-Archean continental crust basement in this area. The Zhaojikou lead-zinc deposit is developed in the east to the fault zone and its west side. The orebody is vein-like and lenticular distributed in the secondary tensional fracture and fissure in the Dongzhi fault zone and its west side, and the ore is breccia, vein and reticular vein. Controlled by the muddy filling in the fault zone, no mineralization was found in the upper disc of the east to the east of the fault. The K-Ar fitting ages of fault gouge in Dongzhi fault are 126.6 and 138.3 Ma.This indicates that the Dongzhi fault occurred in the early to late Yanshanian period.
【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】:2015
【分類號】:P618.4;P542
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