Characteristics and geological significance of seismites in the Lower Jurassic Fengjiahe Formation in western Chuxiong Basin

Seismites constitute the important recorder of ancient earthquake. By the observation of sheet geological survey and the studies of thin section, the seismites were recognized in Fengjiahe Formation, West Chuxiong Basin. The syn-sedimentary deformation serves as the main marker, the seismic structure of the in-situ phase includes such factors as stepmicro-faults, seismo-folds, fluidized soft structures, fluidized veins, sandy volcano, load casts, flame structures, pillow structures, ball structures, brecciation, seismo-cracks, whereas the dissimilarly seismites include seismoturbidite and debris flow rocks. Shock fold rock, vibrational liquefaction clay veins, flame structure, convolution beddings and pinch and swell structures. Through the study of stratigraphic column, seismite sequence was put forward. The establishment of Fengjiahe Formation seismites has important significance for the study of tectonic evolution in Chuxiong Basin, and can provide important foundation for the exploration of oil-gas in Chuxiong Basin.