Through systematic research of the geochemical characteristics of Pb, Sr andNd isotopes combined with the geochemical features of elements on Early Palaeozoic granites in the Danfeng region, Northern Qinling Belt, it is proved thatsmall granitic intrusions occurring in ancient island-arc area-southern active margin of North China Platform, were formed in Early Palaeozoic era. By that timethe oceanic crust between North China and Yangtze platforms subduced northward.The compositional regular variation from Zaoyuan in south to Skimen in north similar to magmatic rocks in modern island-arc area was originated from mixtureof magma originated from amphibolite of Qinling Group (Early Proterozoic era) by13%-30% partial melting and magma from biotite-plagioclase gneiss of the groupnear subduction zone represented by Zaoyuan granite or the gneiss’s relict Phasesafter partial melting northward from the zone.
Chen Yuelong,Zhang Benren,Parat. Abdukader. GEOCHEMICAL CHARACTERISTICS OF Ph, Sr AND Nd ISOTOPES ON EARLY PALAEOZOIC GRANITES IN THE DANFENQ REGION, NORTHERN QINLING BELT[J]. Chinese Journal of Geology, 1995, (3): 247-258.