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Study on Early Cretaceous Stress Fields and Geological Significance of Lingshan Island
LI Jie, JIN Aiwen, HOU Guiting, FU Wenzhao, YANG Zhiqiang2
Acta Scientiarum Naturalium Universitatis Pekinensis    2015, 51 (6): 1069-1077.   DOI: 10.13209/j.0479-8023.2015.076
Abstract1160)      PDF(pc) (2047KB)(973)       Save

Four periods of structural stress fields can be recognized during Early Creraceous in Lingshan Island and adjacent areas based on field geological investigation and summary of the previous data, which is derived from the occurrence data of the stress response structures, i.e., X-type shear jointing, dykes and folds. They are the tectonic stress period of extension in the direction of NW formed the offshore basins during the Laiyang stage, followed extrusion in the direction of NW in the late Laiyang stage, during the Qingshan stage further extension in the direction of NW turned the offshore basins into rift basins, and followed basin inversion in the direction of NW in the late Early Cretaceous. It is concluded that the two extensional phases in Early Cretaceous were dynamically associated with either gravity collapse or lithospheric delamination of the thicked crust or lithosphere in North China and the NW-SE extrusion records the effect by the transmission of the NW-directed subduction of Izanaqi plate to the NW-directed subduction of paleo Pacific plate towards the bottom of the Asian continent.

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