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双井子地区位于星星峡－卡瓦布拉克地块、古生代岛弧东段北侧活动大陆边缘，分布着早石炭世裂陷盆地，有玄武岩、安山岩和流纹岩及其凝灰岩，与金矿成矿有密切的关系。本文在区域地质背景分析基础上，着重对火山岩、火山碎屑岩及其地球化学特征进行系统研究，结果认为，该区安山岩、流纹岩及其凝灰岩为高硅富钾或钠贫铝钙碱－钙性火山岩系列，岩浆源区来自中下地壳；玄武岩则为富钠碱性正常基性类型火山岩系列，岩浆源区来自下地壳，两者为非平衡部分熔融岩浆演化产物。前者Ａｓ、Ｂｉ、Ｗ、Ａｇ、Ａｎ、Ｐｂ、Ｓｂ、Ｓｅ、Ｃｏ、Ｍｏ、Ｂａ、Ｓｎ、Ｒｂ、Ｔｅ等元素含量较高，有重要找矿前景；后者也可为成矿提供部分物质。这些认识，对该区火山岩特征、性质、成矿关系和构造背景，以及进一步找矿，都将有重要理论和实践指导意义。
The Shuangjingzi area is located in the Xingxingxia-Kababulak block, on the active continental margin to the north of the eastern section of the Paleozoic arc, with the Early Carboniferous rift basins with basalts, andesites, rhyolite and tuffs, Mine has a close relationship. Based on the analysis of the regional geological background, this paper systematically studies the volcanic rocks, pyroclastic rocks and their geochemical characteristics. The results show that the andesite, rhyolite and tuff in this area are high-Si-rich Al-Ca-Al-Ca Volcanic rocks, and the magmatic source areas are from the middle and lower crust. Basalt is a normal sodium-rich basic volcanic series and the magma source area comes from the lower crust. Both of them are non-equilibrium part of the evolution of molten magma. The former has high content of elements such as As, Bi, W, Ag, An, Pb, Sb, Se, Co, Mo, Ba, Sn, Rb and Te, . These understandings will have important theoretical and practical guiding significance for the characteristics and properties of volcanic rocks, the relationship and structural background of mineralization and further prospecting in this area.