TERRESTRIAL RESPONSES TO THE CARNIAN PLUVIAL EPISODE IN THE LATE TRIASSIC:RESEARCH STATUS AND PROSPECTS
The Carnian Pluvial Episode(CPE,ca.234～232 Ma)is one of the most significant hyperthermal events in the Mesozoic Era and has also been a pivotal topic in geosciences over the past decade.In recent years,geologists have successively conducted comprehensive research on the terrestrial response of the CPE through multiple proxies,resulting in a wealth of new insights into climate change,triggering mechanisms and biodiversity changes.This paper presents a summary of the continental sedimentation characteristics,pollen record,geochemical signals and terrestrial biological features during the CPE.The CPE is characterized by an increase in freshwater lacustrine,deltaic,and coal-bearing sediments,accompanied by an absence of evaporites.The diversity of terrestrial hygrophytic plants and freshwater algae significantly increased during the CPE,indicating a remarkable enhancement of the hydrological cycling.However,notable arid climates developed in regions such as the Central European Basin,UK,Brazil and parts of Antarctica,possibly showing that regional climate variation was not uniform under high-temperature regimes.Some palynological records demonstrating a wet-dry transition are not synchronous with the end of the carbon isotope negative excursion,requiring a definition of the end of the CPE to avoid confusion in comparing different stages of this event.Major terrestrial life changes during the CPE included the extinction of certain tetrapod groups,the radiation of dinosaurs,bennettitaleans and conifers,the origin of crocodiles and mammals,and the first appearance of amber inclusions.However,accurately reconstructing the relationship between biota and the environment during the CPE remains challenging due to the incompleteness of the fossil record and the low precision of age constraints in terrestrial sediments.Therefore,this review highlights the need for comprehensive stratigraphic work to facilitate accurate cross-basin correlation.Moreover,considering the intensified hydrological cycle during the CPE,it is likely that regional climate variation was not uniform.High-resolution analyses of continental sediments are anticipated to be crucial in elucidating the mechanisms that triggered and terminated the CPE.
Triassichyperthermal eventsterrestrial ecosystemscarbon cyclelarge igneous province
万方数据
维普
