中国三叠纪孢粉组合特征及其分区的初步探讨
    点此下载全文
引用本文:曲立范,杨基端,白云洪,张振来.1983.中国三叠纪孢粉组合特征及其分区的初步探讨[J].地球学报,5(1):81-94.
DOI:
摘要点击次数: 3145
全文下载次数: 20681
作者单位
曲立范 中国地质科学院地质研究所 
杨基端 中国地质科学院地质研究所 
白云洪 成都地质矿产研究所 
张振来 宜昌地质矿产研究所 
中文摘要:文中介绍了我国陆相三叠纪的地层概况,重点对我国南北方孢粉组合进行了初步总结,并建立了三叠纪孢粉组合带。北方分三个带、四个亚带;南方(除早三叠世外)建立了三个组合带。同时根据孢粉组合特征,初步探讨了三叠纪的植物分区。
 
A PRELIMINARY DISCUSSION ON THE CHARACTERISTICS AND STRATIGRAPHIC DIVISIONS OF TRIASSIC SPORES AND POLLEN IN CHINA
Abstract:Being well-developed and widespread, the Triassic in China occursin two sedimentary domains, the north and south domains separated bythe Qinling-Kunlun and characterized by fossil spores and pollen.The north sedimentary domain, represented by the Shaanxi-Gansu-Ningxia Basin and Qingshui Basin, is characterized by continental Triassic, with three spore and pollen assemblage zones enumerated in ascending order as follows. 1. The Lundbladispora-Taeniaesporites assemblage zone is eiquvalent in horizon to Early Triassic Liujiagou Formation (T_11) and Heshanggou Formation (T_12). It may be subdivided into two subzones, that is,the lower Lundbladispora-Taeniaesporites-Cycadopites subzone and the upper Lundbladispora-Verrucosisporites-Taeniaesperites subzone. 2. The Punctatisporites-Chordasporites assemblage zone corresponds toErnma Formation (T_12) and Tongchuan Formation (T_22), of MiddleTriassic age. This assemblage is composed of two assemblage subzones,the lower Punctatisporites-Chordasporites-Plicatipollenites subzone and theupper Punctatisporites-Granulatisporites gigantus-Chordasporites subzone. 3. The Dictyophyllidites-Apiculatis poris-Lueckisporites triassicus assemblage zone equals in horizon to the Yanchang Formation, of LateTriassic. Abundant megaspores have been also found in all those assemblagezones of Triassic. The south sedimentary domain: The Middle and Lower Triassic consists mainly of marine deposits, yielding spores and pollen in a few localities, while the upper Triassic is made up of continental or paralicdeposits rich in sporopollen assemblages. As represented by their development in Sichuan and Guizhou, the middle and upper series are subdivided into three assemblage zones: 1. The Verrucosisporites-Corisaccites assemblage zone corresponds inhorizon to the Middle Triassic Guan1in Formation in Weining, Guizhou. 2. The Corollisporites-Micrhystridium assemblage zone is equivalentin horizon to the early Late Triassic Maantang Formation in Sichuan. 3. The Kyrtomisporis-Ricciisporites assemblage zone equals inhorizon to Xujiahe Formaton in Sichuan, of middle and late phases ofLate Triassic. Equivalent beds bearing this assemblage are also rich inmegaspores which are composed of Trileites pinguis, Bacutriletes tylotus,Nathorstisporites hopliticus etc. The data indicated that sporopollen assemblages of the south sedimentary domain are quite different from those of the north domain andthat such a sporopollen difference is consistent with the conclusion reached for the existence of Triassic floral provinces.
查看全文  查看/发表评论  下载PDF阅读器
版权所有 《地球学报》编辑部 Copyright©2008 All Rights Reserved
主管单位:国土资源部 主办单位:中国地质科学院
地址: 北京市西城区百万庄大街26号,中国地质科学院东楼317室 邮编:100037 电话:010-68327396 E-mail: diqiuxb@126.com
技术支持:东方网景