Lower Cretaceous lacustrine successions,North Yellow Sea Basin,eastern China: Rift basin sequence stratigraphy and stacking patterns in response to magmatic activity |
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| Institution: | 1. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255000, China;2. Earth Dynamics Research Group, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;3. John de Laeter Centre, The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;4. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;5. School of Earth Science and Resources, The Laboratory of Mineralization and Dynamics, and Ministry of Education Key Laboratory of Western Mineral Resources and Geological Engineering, Chang''an University, Xi''an 710054, China.;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia, Tomsk State University, pr. Lenina 36, Tomsk, 634050, Russia;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. School of Earth, Atmosphere and Environment, Monash University, Victoria 3800, Australia;3. Sanshandao Gold Company, Shandong Gold Mining Stock Co., Ltd., Laizhou City, Shandong Province 261442, China |
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| Abstract: | A series of Mesozoic rift basins formed in eastern China were associated with magmatic activity and subduction along the Eurasia, Izanagi and Pacific plate margins. The impact of magmatic activity on lacustrine sequence development was documented with well-log and 3-D seismic data from the Jupiter Depression in the North Yellow Sea Basin. We identified key surfaces, retrogradational and progradational parasequence sets, and defined the characteristics of systems tracts and the internal sequence components for the Lower Cretaceous (K1SQ1). A 2-D SEDPAK numerical stratigraphic forward modeling was used to further constrain sequence development in the Jupiter Depression by considering different modeling parameters and the spatial-temporal characteristics of magmatic activity. Modeling results were compared and matched with the sequence architecture observed from seismic and well interpretations. Magmatic activity impacts on the development of the K1SQ1 sequence in the North Yellow Sea Basin include topographic variation, lake level fluctuation, and sediment supply ratios. Results suggest that magmatic upwelling uplifted the northwestern area of the Jupiter Depression and formed its slope break during the late Jurassic or early Cretaceous. Along with uplifting, relative lake level dropped sharply and lake accommodation was reduced, but with increased sediment supply. Therefore, sediment accumulated along the slope break as a lowstand systems tract. Later on, as lake level continuously rose, transgressive and highstand systems tracts were developed. The proposed stacking pattern provides an analog, and a useful model, for lacustrine sequence development in response to magmatic activities in eastern China and other rift basins of similar tectonic setting. |
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| Keywords: | Sequence architecture Magmatic activity Lacustrine successions North Yellow Sea Basin Eastern China |
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