High-frequency lacustrine sequence stratigraphy of clastic lakes:lessons from ancient successions  

作　　者：Carlos Zavala Hua-Qing Liu Xiang-Bo Li Valentin Trobbiani Yang Li Mariano Arcuri Agustin Zorzano 

机构地区：[1]Departamento de Geología,Universidad Nacional del Sur(UNS),Bahía Blanca,Buenos Aires,Argentina [2]GCS Consulting Services Bahía Blanca,Buenos Aires,Argentina [3]Research Institute of Petroleum Exploration&Development-Northwest,PetroChina,Lanzhou 730020,China [4]Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Buenos Aires,Argentina [5]Shandong University of Science and Technology,Qingdao 266590,Shandong Province,China

出　　处：《Journal of Palaeogeography》2024年第4期621-645,共25页古地理学报（英文版）

摘　　要：Sequence stratigraphic concepts and methods provide novel tools for performing stratigraphic analysis,allowing us to improve our understanding of depositional models and basin evolution.Main controls and depositional elements(e.g.,surfaces,systems tracts,parasequences,etc.)recognized in conventional sequence stratigraphy are designed for marine-related systems.In contrast,the sequence stratigraphy of lacustrine successions is much more complex and poorly understood,because it is not driven by sea-level changes,but by a complex interaction between tectonics and high-frequency climatic cycles.The comprehensive analysis of the water balance of lacustrine systems allows the recognition of three types of lake conditions:Underfilled,balanced-fill and overfilled lakes.Understanding the lake conditions in ancient successions is fundamental for unraveling lacustrine sequence stratigraphy,since these conditions effectively control water salinity,internal stacking pattern and the characteristics of systems tracts.Underfilled lakes are hydrologically closed lakes,and consequently,the lake-level can highly fluctuate,driven by high-frequency wet-dry climatic cycles.During wet periods,rivers supply water and sediments,resulting in fining-and thinning-upward elementary depositional sequences(EDS's)accumulated during the transgressive systems tract(TST).In contrast,dry periods are characterized by a relative lake-level fall with the subaerial exposure of lake margin areas during the regressive systems tract(RST).Lake water salinity can fluctuate from brackish to hypersaline.Balanced-fill lakes are partially closed lakes,and consequently,they have characteristics of both underfilled and overfilled lakes.During the TST,the lake is in underfilled condition,and consequently,the introduction of water and sediment will accumulate a fining-upward interval until reaching the spill point during the maximum flooding.The RST is accumulated under an overfilled lake condition,with coarseningupward progradational littoral deltas and related su

关 键 词：Lacustrine sequence stratigraphy Underfilled lakes Balanced-fill lakes Overfilled lakes Forced transgression Forced regression 

分 类 号：P539.2[天文地球—古生物学与地层学]