廣東陽春盆地錫山巖體巖石地球化學(xué)、年代學(xué)和氧逸度特征及其對錫成礦作用的制約
[Abstract]:Nanling area is famous for its enrichment of non-ferrous and rare-metal minerals and associated polycyclic and polygenetic granites. In this paper, the authors have studied the Xishan rock body from the aspects of petrography, petrochemistry, trace elements, geochemistry of rare earth elements, geochronology and oxygen fugacity characteristics, and discussed the genetic relationship between tin mineralization and granite rock mass, and the influence of oxygen fugacity characteristics on tin mineralization. The results of zircon U-Pb dating indicate that the Xishan and Mashilongtian intrusions are located at 80Ma and 77 Ma, respectively. By comparing the characteristics of main trace elements and rare earth elements, it is shown that the Xishan and Mashuilongtian rock bodies have the same evolution characteristics. Sufficient evidence indicates that the Xishan rock body is the product of magma evolution from partially melting continental crust to the late stage. Tin mineralization is directly related to biotite granite, and mineralization occurs in the post-magmatic stage of gasification and high temperature hydrothermal stage. The oxygen fugacity of biotite in Xishan rock body is lower than that of Ni-NiO line. The ratio of zircon Ce~ (4) / Ce~ (3) is 7.48 ~ 77.37, with an average value of 26.63, which is similar to that of other tin bearing granites in Nanling area. These oxygen fugacity characteristics indicate that the Xishan rock body belongs to the reductive granite body and the low oxygen fugacity and the dolomization play a positive role in the enrichment and mineralization of tin.
【學(xué)位授予單位】:成都理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P618.44
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