Apatite and zircon fision track (FT) analyses werecarried out to reconstruct the thermal histories of the CretaceousPungam and Yeongdong basins, Korea. These basins were formedalong the sinistral strike-slip faults in the Early Cretaceous andwere compressed in the Late Cretaceous by transpressional stressesdue to the change in subduction direction of the Kula/Pacific Plate.sistent FT ages of ca. 50 Ma and ca. 63 Ma, respectively, muchyounger than their stratigraphic ages. In contrast, the zircon FTages of both basins show relatively wide ranges, i.e., from 89 to70 Ma in the Pungam Basin, and from 83 to 64 Ma in the Yeo-ngdong Basin. Zircon single-grain age spectra also show multipleage populations. Co-existence of both the older and younger FTages in comparison to the depositional age (Pungam Basin: ~70Ma, Yeongdong Basin: ~100 Ma) indicates that the zircon samplesfrom both basins were partially annealed. The Pungam Basin wasvolcanic activity and associated hydrothermal fluid, then cooledbelow the apatite closure temperature at ca. 50 Ma. The Yeong-dong Basin was also heated into the ZPAZ after deposition byburial and volcanic activity, then cooled down below the apatiteclosure temperature at ca. 63 Ma, and was uplifted to the presentsurface. Comparing these data with those of the GyeongsangBasin, the response to transpressional stresses seems not to be con-trolled by the distance of the basin from the active continentalmargin. Further studies are needed to clarify such tectonic inver-sion of the sedimentary basins in the active continental margin.