Citation: | OUYANG Junyong, ZHANG Shuming, ZHANG Xin, LIU Long, XIA Yinchu, WU Zhichun, WAN Kang. 2023. Magmatic evolution characteristics of two types of rhyolite dacite in Xiangshan uranium ore field——Evidence from chemical composition of feldspar and biotite[J]. Geology in China, 50(5): 1495-1512. doi: 10.12029/gc20201110002 |
This paper is the result of mineral exploration engineering.
Minerals formed by magmatic differentiation, such as feldspar and biotite, can be used as indicators of magmatic evolution of host rocks.There are disputes between rhyodacite and rhyodacite porphyry from Xiangshan, in the aspects of formation age, origin, material source and mantle material participation.
In this paper, the electron probe technology is used to quantitatively analyze the feldspar and biotite in two types of rhyodacites in Xiangshan, and the composition, material source, formation temperature, oxygen fugacity and rock properties of the two types of rhyodacites are analyzed and studied.
The results show that the rhyodacite of Xiangshan Daguding Formation can be divided into two types, one is the effusive rhyodacite (K1d2a) and the other is the intrusive rhyodacite porphyry (K1d2b). The types of feldspar from rhyodacite are more than those of rhyodacite porphyry. The feldspar types of rhyodacite include albite, potassium feldspar, potassium sanidine, feldspar and andesine. The main feldspar types of rhyodacite porphyry are albite, potassium feldspar and potassium-sanidine. The biotite formation temperature of rhyodacite and rhyodacite porphyry is basically the same (750±20℃). Rhyodacite and rhyodacite porphyry both have high oxygen fugacity and belong to calc-alkaline rocks, indicating the same magma material source with part from mantle material.
The chemical composition is basically the same, together with the same feldspar type, the same material source, the same crystallization temperature, the sameoxygen fugacity, and the same rock properties, indicating that the two have homology.
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Simplified geology of the Gan-Hang Volcanic Belt (modified from Yu Xinqi et al., 2006)
Geological schematic diagram of Xiangshan (modified from Liu Long et al., 2020)
Diagram of Ruyiting section(modified from Wu Rengui, 1999)
Section of line 55 of Zoujiashan deposit (according to internal data of Team 261, Jiangxi Geological Bureauof Nuclear Industry)
Deformation characteristics of rhyolite dacite (Location: Ruyiting section gully)
Geological photographs of the rhyolite dacite in Xiangshan
Geologic photographs of the rhyolite porphyry in Xiangshan
Ab-An-Or ternary diagram of plagioclase in two types of rhyolite dacite in Xiangshan (after Deer et al., 1992)
Relationship diagrams of Na2O, Al2O3, CaO, An, Ab, Or vs SiO2 in plagioclase
Relationship of SiO2, TiO2, Al2O3, FeO, MgO, MnO, K2O, Na2O vs. Fe2+/(Fe2++Mg) in magmatic biotite
Classified figures of the composition of biotite in two types of rhyolite dacite in Xiangshan (basemap after Foster, 1960)
Electron probe EPMA image of feldspars two types of rhyolite dacite in Xiangshan
Discriminating diagram of biotite of two types in rhyolite dacite