Theoretical system and research progress of eolian deposits
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Abstract: Eolian deposition, as a product of wind erosion, transportation, and accumulation on the Earth's surface, has a wide spatial and temporal distribution in geological history. Its formation and evolution are closely related to arid climatic conditions and relatively continuous subsidence of paleogeographic backgrounds, making it an important carrier and ideal material for regional paleogeography and paleoclimatology research. After nearly a century of research, a relatively complete theoretical system of eolian deposition has been formed internationally, which has effectively promoted the identification and interpretation of ancient eolian deposits. However, there is currently no systematic introduction to the theoretical system of eolian deposition in China. In recent years, with the discovery and reporting of more ancient desert basins in China, research on ancient eolian deposition has gradually attracted widespread attention both domestically and internationally. In order to better promote research on aeolian deposition in China, this article provides a detailed introduction to the theoretical system of eolian deposition based on previous research, including the atmospheric flow characteristics, fluid properties and wind fields, sediment transport, composition and structure of eolian deposits, eolian bedform morphology, eolian stratigraphy, eolian interfaces, eolian depositional systems, formation and preservation of eolian deposits, etc. The current problems in eolian deposition research are discussed, and important future research directions are proposed.