中国科学院南京地质古生物研究所机构知识库

We compiled the Cretaceous sporopollen fossil data from 19 locations of six provinces in South China, reviewed the affinities of spore and pollen genera by examining and assessing these fossils with published data, and associated them with the sporomorph eco-groups (SEG) model and vegetation type. Seven palynofloral assemblages (PA1-PA7) were identified. PA1 (Berriasian-Valanginian) and PA2 (Hauterivian-Barremian) mainly include Cheirolepidiaceae (similar to 60-80%), Cycadophytes (similar to 10%), and Lygodiaceae (similar to 10%), indicating warm and dry climate; PA3 (Aptian) and PA4 (Albian) represent warm, semi-arid to semi-humid climate with vegetation composed of Araucariaceae (similar to 10%), Cheirolepidiaceae (similar to 40-60%), Cycadophytes (similar to 10%), and Lygodiaceae (similar to 10%); PA5 (Cenomanian-Turonian) and PA6 (Coniacian-Santonian) imply a hot, semi-humid to humid climate with the vegetation taxa of Lygodiaceae (similar to 20-40%), Cheirolepidiaceae (similar to 20-50%), Ephedraceae (-5-8%), and Araucariaceae (similar to 10%); and PA7 (Campanian-Maastrichtian) indicates a relatively cool and dry climate evidenced by the vegetation composition of Cheirolepidiaceae (similar to 30-40%), Pteridaceae (similar to 10%), Ephedraceae (similar to 5-8%), and Ulmaceae (similar to 30-40%). Our SEG analysis reveals three climatic evolution phases: the Berriasian-Barremian warmdry phase, the Aptian-Santonian warm-wet phase, and the Campanian-Maastrichtian cool-dry phase. The climatic variation pattern is compatible with that indicated by fossil stomatal pCO(2) values and the pCO(2) simulation of GEOCARB II and III models, providing independent climatic proxies of the region and contributing to better understanding of the global Cretaceous climatic changes. (C) 2021 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights reserved.