MAIN CHARACTERS OF THE NEOPROTEROZOIC SEISMITES IN ZAOZHUANG—LINYI AREA, WESTERN SHANDONG
Zhang Xianyi1, Wang Bingshan2, Li Yuanzhong3, Yang Ruiying3
1. Chengdu University of Technology, Chengdu 610059; 2. Shandong University of Science and Technology, Qingdao, Shandong 266510; 3. South Shandong Geo-Engineering Institute of Shandong Province, Yanzhou, Shandong 272000
The synsedimentary structures which was created by earthquakes, such as the crystallitic calcite veins, intraformational folds, intrastratal micro-faults, intraclast carbonate rocks and so on, were well developed in the Neoproterozoic carbonate rock series in Zaozhuang-Linyi area, western Shandong. Based on field observation, geological section survey and laboratory study, these phenomena of synsedimentary structures were thought to be results of strong vibration resulted from the earthquakes, and the combinations of vibration and accumulation rocks were formed in adjacent area of the epicenter by vibration liquefaction and vibration distortion in unconsolidated rocks. In the light of this mechanism, seven types of seismites were described and the seismic succession by vibrational liquefaction including three vibration and accumulation units (A, B and C) was set up. The formation of vibration and accumulation rocks should be closely related to activities of the paleo-Tan-Lu fault.