Sedimentary features and its tectono-palaeogeographic significance of the Lower Cretaceous Tongbomiao Formation in Tanan sag, Tamtsag Basin, Mongolia
Li Qiang1, Zhang Ge1, Sun Xiaodong1, Wu Genyao2, Liu He1, Li Chunbai1, Wang Jinkui1, Liu Shaojun1, Gao Geng1, Zhu Defeng1
1 Exploration and Development Research Institute of Daqing Oilfield Ltd., Daqing 163712, Heilongjiang 2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
Abstract：The Tongbomiao Formation is a record of initial rifting stage of the Tamtsag Basin in Mongolia during the Early Cretaceous. Constrained by both the violently rolling topography of the Upper Jurassic basement and the contemporaneous normal faulting,the sediments with fan delta facies were developed during early depositional period of the Tongbomiao Formation in Tanan sag. The normal faulting is tending towards calm during the late depositional period of the Tongbomiao Formation,and the fan delta and lacustrine sandstone and mudstone occurred in study area. Based on granulometric analysis,well logging sedimentary facies analysis and facies changes along the section lines,the sedimentary features of fan delta facies and lacustrine facies are concluded in this paper,and the planar distribution of the sedimentary facies belts of Tongbomiao Formation in Tanan sag is drawn. Only an embryonic form of Tanan sag occurred during the depositional period of Tongbomiao Formation. Correspondingly,there were multiple and relatively isolated depositing centers,which were connected together and became linear subsidence belts with NE-orientated elongation by further activities of the contemporaneous normal faults during the depositional period of Nantun Formation,when the sag expanded westwards.
Li Qiang,Zhang Ge,Sun Xiaodong et al. Sedimentary features and its tectono-palaeogeographic significance of the Lower Cretaceous Tongbomiao Formation in Tanan sag, Tamtsag Basin, Mongolia[J]. JOPC, 2014, 16(6): 897-906.
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