| 广西桂林地区晚三叠世孢粉组合及其地层意义 |
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| 引用本文： | 刘兆生,李镇梁.广西桂林地区晚三叠世孢粉组合及其地层意义[J].地层学杂志,1998,22(2):116-121,T002. |
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| 作者姓名： | 刘兆生 李镇梁 |
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| 作者单位： | [1]中国科学院南京地质古生物研究所 [2]广西区域地质调查院 |
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| 摘 要： | 广西桂林地区首次发现晚三叠世孢粉化石２７属３７种，可称为Ｄｉｃｔｙｏｐｈｙｌｉｄｉｔｅｓ－Ｃａｎａｌｉ－ｚｏｎｏｓｐｏｒａ－Ｏｖａｌｉｐｏｌｉｓ－Ｒｉｃｃｉｓｐｏｒｉｔｅｓ组合，其中的主要属种在国内外均为晚三叠世的重要分子，并可与我国华南地区和欧洲有关晚三叠世孢粉组合进行对比。因此，当前组合的地质时代属于晚三叠世，这填补了桂林地区中生代地质发展史中的一个空白。
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| 关 键 词： | 桂林，广西，晚三叠世，孢粉组合 |
A Late Triassic Palynological Assemblage from the Guilin Area of Guangxi and its Stratigraphical Significance |
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| Abstract: | The present paper deals with a Late Triassic palynological assemblage from the Guilin area of Guangxi Zhuang Autonomous Region, South China.The present miospores including 37 species of 27 genera in total, are recognized as the Dictyophyllidites Canalizonospora Ovalipollis Ricciisporites Assemblage.This palynological assemblage is characterized by the dominance of the gymnosperm pollen, accountins for 78.44% and the presence of some pteridophyte spores, making up 20.37%. bryophyte spores are very rare, consisting of only 1.15%.In the gymnosperm pollen, bisaccate pollen with no striations are the most numerous (45.76%), e. g. Vitreisporites sp., Quadraeculina anellaeformis, Alisporites australis, A. rotundus , A. parvus, A. sp., Pseudopicea variabiliformis , P. rotundiformis , Pinuspollenites divulgatus, P . sp., Podocarpidites minutus. Next in number is Chasmatosporites. It is interesting that the important pollen, such as Ovalipollis ovalis , O. breviformis , Taeniaesporites albertae , Ricciisporites sp., are also present in the assemblage.In the pteridophyte spores, Asseretospora ranks first in number and Lunzisporites ranks second. In addition,there are still other spores like Cyathidites minor , Dictyophylli dites harrisii, Punctatisporites sp., Acanthotriletes sp., Lophotriletes sp., Granulatispori tes sp., Verrucosisporites sp., Densoisporites sp., Canalizonospora sp., Marattisporites sp.,etc.The present assemblage contains such Late Triassic important elements as Ovalipollis, Ricciisporites, Canalizonospora, Dictyophyllidites, Lunzisporites, etc. This assemblage can be correlated also with the Late Triassic palynological assemblages from the Yipinglang,Sanqiutian, Xujiahe,Tumengela, Daqiaode, Shezi and Daqing Formations in South China, and from England, Switzerland, Austria and other countries. Therefore,this assemblage is undoubtedly of Late Triassic age. |
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| Keywords: | Guilin Guangxi Late Triassic palynological assemblage |
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