| 冀北—辽西地区侏罗—白垩纪之交期的孢粉植物群演替与古气候变化 |
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| 关键词:Jurassic–Cretaceous palynoflora paleoclimate change northern Hebei-western Liaoning region China |
| 基金项目:国家科学技术部973项目(编号: 2006CB701405; 2012CB822004)；中国地质调查局地质调查项目(编号: 12120114026801) |
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| The Palynoflora Alternation and the Paleoclimate Change at the Turning Time between Late Jurassic and Early Cretaceous in Northern Hebei and Western Liaoning |
| According to the stratigraphic distribution of the palynoflora at the turning time of the Jurassic–Cretaceous in northern Hebei and western Liaoning, nine sporopollen assemblage zones can be recognized, which are in ascending order of “Cyathidites–Cycadopites–Classopollis” Assemblage Zone, “Classopollis” Assemblage Zone, “Piceites–Podocarpidites–Schizaeoisporites” Assemblage Zone, “Cicatricosisporites–Luanpingspora–Jugella” Assemblage Zone, “Piceaepollenites–Densoisporites –Cicatricosisporites –Aeguitriradites” Assemblage Zone, “Piceaepollenites–Cicatricosisporites –Concavissimisporites” Assemblage Zone, “Liaoxisporites–Pilosisporites –Clasopollis” Assemblage Zone, “Pilosisporites–Appendicisporites–Cicatricosisporites–Triporoletes” Assemblage Zone, “Deltoidospora –Cicatricosisporites–Appendicisporites” Assemblage Zone and “Cicatricosisporites–Classopollis –Schizaeoisporites–Ephedripites” Assemblage Zone. Based on the sporopollen assemblages, the authors reconstructed the paleoclimate and paleoenvironment of the study area: warm and humid low mountains and hills in Middle Jurassic, arid wastelands in Late Jurassic, cool and damp low mountains in the early stage of Early Cretaceous, cool and damp high mountains in the middle stage of Early Cretaceous, warm and humid low lands and fenlands in the late stage of Early Cretaceous and xerothermic low lands in the latest stage of Early Cretaceous. In addition, this paper proposes a “sanctuary” model for the biota alternation at the turning time between Late Jurassic and Early Cretaceous. |
| WANG Da-ning,WANG Xu-ri,JI Qiang.2016.The Palynoflora Alternation and the Paleoclimate Change at the Turning Time between Late Jurassic and Early Cretaceous in Northern Hebei and Western Liaoning[J].Acta Geoscientica Sinica,37(4):449-459. |
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