In the Gangdise area distribute extensively a suite of intermediate aci d it y volca nic rocks of the Early Tertiary Linzizong Group,belonging to paralic facies or c ontinental facies.The main rock type is andesite, w hile there are associated intrusive rocks including adamellite—granite series.F rom the geochemical research of the rocks, we can infer that the volcanic rocks of this region mostly belong to subalkali series,showing apparen t evolution tendency towards the calcalkaline suite. For most volcanic ro c ks,FeO*/MgO＞20, K2O/Na2O＞06 and K2O＞138% , which indicates a continuous rising trend from i ntermediate to acidity.Analysis of frace elements showshighK contents and ri ght oblique REE partition curves in addition to obvious negative euanomaly with isotopic ages of 382～650 Ma. All of these present an activ e epicontinental feature of the volcanic rocks in this areaBasedon the geochemical characteristics and reg ional structure evo lution of the volcanic rocks in this region, it is clear that the eme rgence of the rocks in t his area is due to the activities of volcanos on the continental margin du ring the process of the contientcontinent collision.