Characteristics and Numerical Simulation of Extensional Structure Since Late Mesozoic in Western Shandong, China

HU Qiuyuan, LI Li, LI Yongpeng


The extensional structure in western Shandong is composed of steep normal fault and décollement fault, which two together constitute a unique “extensional structure framework”. With the regional geological survey of West Shandong Rise and seismic data from Jiyang Depression, we make comprehensive researches on extensional structural features in western Shandong. A number of NW-trending and NWW-trending normal faults, together with several NE-trending and nearly EW-trending faults, constitute a typical “fault-block style” all over the research area. In the steep normal fault zone, there are dynamic breccia, fault clay and scraping trace making up signs of faults activity. Low-angle décollement faults are mainly found at unconformity / lithologically abrupt interfaces or disconformity surfaces, of which the most outstanding in western Shandong occurred along unconformity surface between the Archean and Cambrian (Ar/∈), and the disconformity surface between the Ordovician and Carboniferous (O/C). Based on the finite element method, we use the software of Ansys12.0 to carry out tectonic stress field numerical simulation of the evolution in research area since late Mesozoic. The result indicates that the strength of the tectonic stress field has experienced a process from strong to weak since late Mesozoic. The evolution of extensional structures of western Shandong commenced in late Jurassic, with the direction of NE-SW. And the research area entered its first massive extended fault-depression phase in Late Jurassic-Early Cretaceous (140 - 65 Ma). Then the extension continued in Paleocene-Early Eocene (65 - 53 Ma) which was a transforming transitional period with its extending orientation transformed from NE-SW to SN. In Eocene-Oligocene (53 - 23.3 Ma) the extension met its large-scale extensional activity with the direction of NW-SE. As can be seen in the study, the essential dynamic origin is mainly influenced by the structural changes since late Mesozoic, and the chief factors leading to the tectonic stress field change are the subduction of the Pacific Plate and the strike slip motion of the boundary faults.
Key words: Numerical simulation; Extensional structures; Since late Mesozoic; Western Shandong


Numerical simulation; Extensional structures; Since late Mesozoic; Western Shandong

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