CRETACEOUS STRESS FIELD OF THE MUPING-JIMO FAULT BELT AND ITS IMPLICATION FOR TECTONIC EVOLUTION

Cretaceous is a key period for tectonic transformation in eastern China. Comparing to the Tan-Lu fault belt, the Jimo-Muping fault belt is another large-scale tectonic boundary in the east part of China. Many geologists have devoted to the studies of the structural characters and evolution history, especially those in Cretaceous, in the past decades. This time, we, based on the measured data, calculated the Cretaceous tectonic stress fields of the Muping-Jimo fault. The results indicate that the evolutionary history of the fault can be classified into five stages, i.e. 1) the Laiyang stage of Early Cretaceous dominated by NW-SE extension, under the control of the post-orogenic extension; 2) the Qingshan stage of Early Cretaceous dominated by W-E extension caused by a rifting process; 3) the NW-SE compression stage at the end of Early Cretaceous due to the oblique subduction of the Paleo-Pacific Plate under the East Asian continent; 4) the Wangshi stage of Late Cretaceous dominated by N-S extension, controlled by the Tethys system and the direction change of the subduction of the Paleo-Pacific Plate; 5) the stage of Late Paleocene dominated by NE-SW compression.