Petrogenesis of Cenozoic Volcanic Rocks in Hefei Basin,China
中国合肥盆地新生代火山岩成因岩石学研究

The scattered outcrops of the Palaeocene and Oligocene(possibly to Miocene)basaltic rocks occur in Hefei Basin in eastern China.The former is tholeiitic, and the later alkalic. The petrology and trace element as well as isotope geochemistry of these rocks have been studied in detail. The Palaeocene tholeiitic magma should be derived from partial melting of an older mantle wedge that formed by the early Mesozoic subduction of Yangtze Plate beneath North China Plate. The eastern China Continent has entered into the stage of rifting continental margin since Oligocene. The alkalic basaltic magma of this stage may be derived from asthenosphere.