Characteristics and significance of palynological assemblage of Ziliujing Formation and Shaximiao Formation in Yanjin area, Yunnan Province
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摘要:
对云南盐津地区侏罗系自流井组、沙溪庙组的孢粉组合特征和规律的研究表明，自流井组中以裸子植物花粉占绝对优势，而蕨类植物孢子含量低；裸子植物花粉中以Pinuspollenites为主，蕨类植物孢子只有Laevigatosporites。自流井组时代为早侏罗世，属于热带半干旱-温暖气候。沙溪庙组中裸子植物花粉以Pinuspollenites为主，含有Psophosphaera，Classopollis等；在蕨类植物孢子中Neoraistrickia的含量最高。沙溪庙组时代为中侏罗世，属于热带或亚热带较温暖气候。
Abstract:Based on the characteritics and regularities of palynological assemblage of Ziliujing Formation and Shaximiao Formation of Jurassic in Yanjin area of Yunnan Province, the results show that the pollen of gymnosperms dominates the Ziliujing Formation, while the content of fern spores is low.Pinuspollenites are dominant in the pollen of gymosperms, while only Laevigatosporites were found in the spores of ferns.The Early Jurassic Ziliujing Formation belongs to the tropical semi-arid tropical climate.Pinuspollenites are dominant in the pollen of gymnosperms in Shaximiao Formation, including Psophosphaera, Classopollis, etc.The content of Neoraistrickiais the highest in fern spores.The Middle Jurassic Shaximiao Formation had tropical or subtropical climate.
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Key words:
- Yanjin /
- Ziliujing Formation /
- Shaximiao Formation /
- palynological assemblage /
- stratigraphic age /
- paleoclimate
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表 1 自流井组孢粉化石
Table 1. Statistics of fossil pollen and spores from the Ziliujing Formation
孢粉类群 粒数 百分含量/% 蕨类孢子 2 9.52 Laevigatosporites sp. 2 9.52 裸子植物花粉 19 90.48 Cerebropollenites sp. 1 4.76 Pinuspollenites sp. 14 66.67 Psophosphaera flavus 1 4.76 Psophosphaera crassa 1 4.76 Granasporites magnus 1 4.76 Chasmatosporites sp. 1 4.76 合计 21 100 
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表 2 沙溪庙组孢粉化石
Table 2. Statistics of fossil pollen and spores from the Shaximiao Formation
孢粉类群 粒数 百分含量/% 蕨类孢子 9 42.86 Leiotriletes sp. 1 4.76 Leptolepidites sp. 1 4.76 Neoraistrickia rotundiformis 1 4.76 Neoraistrickia sp. 3 14.29 Murospora sp. 1 4.76 Polypodiisporite sp. 2 9.52 裸子植物花粉 12 57.14 Pinuspollenites sp. 5 23.81 Psophosphaera crassa 2 9.52 Psophosphaera sp. 1 4.76 Quadraeculina sp. 1 4.76 Classopollis sp. 3 14.29 合计 21 100
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