Sedimentology of a topset-dominated,braided river delta of Huangqihai Lake,North China: implications for formation mechanisms |
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| Authors: | " target="_blank">Xin Shan Shengli Li Shunli Li Xinghe Yu Li Wan Lina Jin Tianyi Wang |
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| Institution: | 1.Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography,State Oceanic Administration,Qingdao,China;2.Qingdao Institute of Marine Geology,Qingdao,China;3.School of Energy Resources,China University of Geosciences (Beijing),Beijing,China;4.College of Geosciences,China University of Petroleum (Beijing),Beijing,China;5.School of Earth Sciences,The University of Queensland,St. Lucia, Brisbane,Australia;6.School of Exploration Technology and Engineering,Hebei GEO University,Shijiazhuang,China |
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| Abstract: | Sedimentary characteristics and genesis of a sandy, topset-dominated braided river delta from Huangqihai Lake were investigated using trenching and a ground penetrating radar survey. Ten lithofacies types were identified with assistance of grain size distribution to record a broad range of depositional processes within an overall coarsening upward sequence. Four distinct architectural elements, including channel fill, compound bar, sand sheet, and river mouth bar, built up this delta. No obvious foreset can be identified in this braided river delta. A gentle slope (0.2°) and shallow basin (<10 m deep), young age (~25 years), and low sediment supply caused by human disturbance and semi-arid climate, are believed to allow this type of topset-dominated delta to form. |
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