Abstract: The internal texture of zircons from post-collisional basalt and andesite in Dabieshan have been investigated by cathodoluminescence(CL) imaging，and their U-Pb ages and oxygen isotope compositions have been determined by SIMS(Cameca 1270)．A1l zircons from the basalt give U-Pb ages of 130±2 Ma(1σ) and low δ18O values of(4．1±0．2)‰ ．Magmatic zircons from the andesite yield ages of 133±3 Ma(1σ)and 8180 values of(5．1±0．1)‰ ，and inherited zircons from the andesite show ages in two groups of 768～ 805 Ma and 1 827～ 1 873 Ma,but the Same δ18O values of(6．9±0．1)‰ ．It appears that the post-collisional volcanic rocks in Dabieshan were all crystallized at 130 M a．The chemical compositions ，trace element pattern, Sr-Nd isotopic ratios and zircon ages of post-collisional volcanic rocks from Dabieshan are similar to the intrusive rocks，so that these rocks may possibly share the same source and petrogenesis．Moreover，the same ages of both basalt and andesite imply their possible petrogenetic connections ．Some zircons from the andesite display retrograde zoning，which are considered to be the relict zircons from the protolith．Their inherited ages correspond to characteristic age signatures from the Yangtze Block and the North China Bloc k, respectively．The lowδ18O zircons from the basalt suggest that the source of basalt magma might contain recycled component like low δ18O protolith of the Dabieshan eclogites ．Therefore，the suture of the Yangtze Bloc k an d the North China Block at depth is probably located in the Beihuaiyang region