The geological record of environmental changes in southwestern Portuguese coastal lagoons since the Lateglacial
作者： M.C Freitas , C Andrade , A Cruces
DOI: 10.1016/S1040-6182(02)00014-9
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摘要: Abstract The multidisciplinary study (sedimentology, palaeoecology, geochemistry, isotopic dating) of the sedimentary infill selected coastal lagoons southwestern Portuguese coast suggests that during Early Holocene, eustasy was dominating element forcing change and controlled sedimentation patterns these areas. strong decrease mean sea-level rise rate observed in Middle Holocene defined an important threshold regional significance. flooded lowlands developed terminal barriers started to silt up initially driven by natural factors (e.g. climate, sediment supply) local expression, which were later added or overwhelmed anthropic influence. latter relates with deforestation agriculture, inducing changes rates delivery coast; human interference rhythms barrier breaching generated significant whole physico-chemical setting lagoonal basins translated into sediments, water quality depth ecosystem's structure. This paper presents examples impacts global versus influences as driving since Lateglacial. available data suggest this line research is crucial support objective accurate models past future evolution.
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