Geochemical Characteristics of Danfeng Meta-Volcanic Rocks in Shangzhou Area,Shaanxi Province

The Danfeng meta-volcanics in the Shangzhou area, Shaanxi Province arecharactered by oceani island arc volcanic geochemistry They are a suite of low-Ktholeiitic series and calc-alkaline series meta-volcanic rocks derived from different sourcesrespectively. These meta-volcanics have high Th/Ta ratios and low contents of Ni, Ta,Ti, Y and Yb, suggesting that they were influenced by the subduction zone components.Many lines of evidence show that the Danfeng meta-volcanics were produced in an oceanicisland are setting of the supra-subduction zone at the southern margin of the North ChinaBlock during the Early Paleozoic.