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西成地区小沟里和三洋坝金矿区发育层状的花岗质岩脉带，其成岩物质既有岩浆热液来源又有地层来源，反映了海西期秦岭裂谷扩张时岩浆热液顺层交代泥盆系岩层的成因特征；层状的花岗质岩脉与石英钠长岩等共同构成了西成地区泥盆纪热液交代，热水沉积所形成的层状交代沉积岩系；层状的岩脉与金矿床的空间关系密切是寻找金矿床的有效岩石标志。
The lacustrine granodiorites developed in the Xiaogouli and Xiyangba gold deposits in the Xicheng area have both magmatic hydrothermal source and stratigraphic source, indicating that the hydrothermal fluid in the Qinling rift during the Hercynian expansion Stratigraphic granitic dykes and quartz albite together form the sedimentary succession of the Devonian hydrothermal metasomatism and hydrothermal deposition in the Xicheng area; stratiform Of the veins and gold deposits closely related to the space is looking for gold deposits effective rock logo.