Palaeoclimates in the Tantou Basin, Luanchuan, western Henan during the Cretaceous-Palaeogene
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摘要: 豫西栾川潭头盆地是一个晚白垩世-古近纪陆相沉积盆地,沉积了一套以红色碎屑岩为主的晚白垩世-古新世地层。本文以孢粉分析为主,综合区内古生物学、岩石学、沉积学等古气候标志,认为研究区高峪沟组下段沉积时期属半干旱的热带气候;上段下部沉积时期为半干旱半湿润的亚热带-热带气候;上段上部沉积时期为半湿润的亚热带气候。大章组底部沉积时期属半湿润的暖温带气候。根据区内古气候特征及化石资料分析认为,研究区K/E界线位于高峪沟组上段的上部与下部之间。Abstract: The Tantou Basin in western Henan is a Late Cretaceous-Palaeogene continental sedimentary basin in which the red clastic rocks are accentuated. The combination of palynological, palaeontological, petrological, sedimentological approaches in the present paper has disclosed that there occurred the semiarid tropical climates during the deposition of the lower member of the Gaoyugou Formation; semiarid to subhumid subtropical to tropical climates during the deposition of the lower part of the upper member of the Gaoyugou Formation, and subhumid subtropical climates during the deposition of the upper part of the upper member of the Gaoyugou Formation. Till the deposition of the basal part of the Dazhang Formation, the subhumid warm temperate climates prevailed over the study area. It is concluded that the Cretaceous-Palaeogene boundary should be delimited in the strata between the upper part and lower part of the upper member of the Gaoyugou Formation.
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Keywords:
- palaeoclimates /
- Cretaceous-Palaeogene /
- Tantou Basin /
- sporopollen analysis
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