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两河火山岩岩片位于秦岭微板块与扬子板块的分界断裂 -巴山弧形构造混杂带内。岩石由亚碱性拉班系列玄武质岩石和钙碱性英安岩、流纹岩组成。基性岩和酸性岩均具有高 Ba,低 Th、U ,显著的 Nb、Ta亏损和 Ti的负异常等地球化学特征 ,玄武岩的 Th/ Yb- Ta/ Yb和 Ti/ Zr- Ti/ Y不活动痕量元素组合特征指示这套火山岩可能产于弧间盆地环境。是勉略洋盆在古生代晚期 -中生代早期发育期间洋壳俯冲及弧内裂陷的岩浆作用产物。该岩片可能是勉略缝合带在巴山弧地区出露的重要岩石学证据
Two rivers of volcanic rocks located in the Qinling Mountains plate and the Yangtze plate boundary fault - Bashan arc structure mixed zone. The rocks are composed of sub-alkaline Laban basaltic rocks and calc-alkaline dacite and rhyolite. Both basic rocks and acidic rocks have the geochemical characteristics of high Ba, low Th, U, significant depletion of Nb, Ta and negative anomalies of Ti. Th / Yb-Ta / Yb and Ti / Zr-Ti / Y basalt are not The combination of trace elements in the activity indicates that this volcanic rock may be produced in the inter-arc basin environment. Is the Mianlang Ocean basin in the late Paleozoic - Mesozoic early during the development of the oceanic crust subduction and magmatic archaeogenic products. This slice may be an important petrological evidence that Mianlue suture zone is exposed in Bashan arc area