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 deri...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.展开更多
Field observation showed that there are many irregular leucocratic intrusive rocks in pillow lavas in the Danfeng Group in the Xiaowangjian area, north Qinling orogenic belt. Photomicrographs indicated that the protol...Field observation showed that there are many irregular leucocratic intrusive rocks in pillow lavas in the Danfeng Group in the Xiaowangjian area, north Qinling orogenic belt. Photomicrographs indicated that the protoliths of those altered leucocratic intr展开更多
文摘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.
基金the National Natural Science Foundation of China (Grant No. 40472119)the Programme of Excellent Young Scientists of the Ministry of Land and Resourcesof China+1 种基金the Ministry of Science and Technology of China (Grant Nos. 2002CB412608 and 2006BABOlAll)the China Geological Survey (Grant Nos. 1212010633601 and 1212010611807)
文摘Field observation showed that there are many irregular leucocratic intrusive rocks in pillow lavas in the Danfeng Group in the Xiaowangjian area, north Qinling orogenic belt. Photomicrographs indicated that the protoliths of those altered leucocratic intr
