Basin evolution and later reformation of marine sediments in southern Guizhou Depression and neighboring areas
Wu Genyao1, Wang Weifeng2, Chi Hongxing3
1 Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029 2 College of Earth Science and Technology，China University of Petroleum（East China)，Qingdao 266555, Shandong 3 Qinhuangdao Branch of Northeastern University，Qinhuangdao 066004, Hebei
Abstract：The southern Guizhou Depression，bounded by the Guiyang-Zhenyuan，Ziyun-Luodian and Tongren-Sandu faults on the north，southwest and east respectively，is a relatively stable block within the Yangtze Craton.The tectono-palaeogeographic evolution of the depression and its neighboring areas could be divided into four stages: Neoproterozoic，Early Paleozoic，Late Paleozoic-Triassic，Jurassic-Paleogene，and the basin development coupling with the neighboring orogenesis was reconstructed.The Guangxi orogeny was an important reformation in the formation period of marine sediments，which resulted in appearance of NE-striking structures.The Indosinian orogeny caused the NEE-orientation Guiyang-Zhenyuan fault and the NW-orientation Ziyun-Luodian fault inverted，and founded the north and southwest boundaries of the southern Guizhou Depression for the both faults.The NE-striking faults rejuvenated repeatedly in Meso-Cenozoic.Two generations of thrusting since the Middle Jurassic could be distinguished.The early one occurred in the Yanshanian orogeny，with the thrusting towards the northwest，and the thrust system expanding to the northwest.The later one occurred in the latest Yanshanian-Himalayan orogeny.Regionally，the NNE-striking faults thrust towards the east to south，and the Tongren-Sandu fault became east boundary of the southern Guizhou Depression.The longitudinal faults within the depression，which created in the Indosinian orogeny，rejuvenated and thrust towards the west，and made up a back-thrust system of the Tongren-Sandu fault in the latest Yanshanian-Himalayan orogeny.The broad folds developed in the upper plates of the longitudinal faults might be beneficial target regions for marine oil-gas exploration in the depression.
Wu Genyao,Wang Weifeng,Chi Hongxing. Basin evolution and later reformation of marine sediments in southern Guizhou Depression and neighboring areas[J]. JOPC, 2012, 14(4): 507-521.
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