EARLY JURASSIC FLORA AND PALEOENVIRONMENT IN DAXIAN AND KAIXIAN COUNTIES, NORTH BORDER OF SICHUAN BASIN, CHINA
-
摘要: 讨论四川盆地北缘(川东) 珍珠冲组植物群的组成、特征及时代.鉴定植物化石47属95种, 该植物群归于Dictyophyllum-Clathropteris系上部Ptilophyllum-Coniopteris组合, 相当于Pliesbachian-Aalenian阶, 与瑞典和格陵兰Thaumatopteris带关系密切.还讨论了四川盆地侏罗纪古气候、沉积环境与成煤关系Abstract: The present paper deals with the composition, features and ages of the flora in the Zhenzhuchong Formation, north borderof Sichuan basin. The plant fossilsobtained are identified to belong to 95 species of 47 genera. This flora should be classified as Ptilophyllum-Coniopteris assemblage in the upper part of the Dictyophyllum-Clathropteris series in age equivalent to the Pliensbachian-Aalenian stage. In this sense, it can be closely associated with the Thaumatopteris zones in Greenland and Sweden. This paper also discusses the Jurassic paleoclimate in the Sichuan basin with the emphasison the relationship between the Early Jurassic sedimentary environment and the coal-forming. It concludes that the increase of the humidity and the decrease of the temperature may have favored the formation of the coal.
-
Key words:
- Early Jurassic /
- flora /
- paleoclimate /
- coal forming feature /
- Sichuan basin
-
图 3 四川开县温泉早侏罗世珍珠冲组层序
1.双壳类; 2.有节类; 3.真蕨类; 4.苏铁类; 5.松柏类; 6.银杏类; 7.树干化石; 8.铁结核; 9.水平纹理; 10.小型交错层理; 11.块状层理; 12.楔状交错层理; 13.槽状交错层理; 14.煤层及古根系; 15.泥岩; 16.粉砂岩与泥岩; 17.粉砂岩; 18.极细砂岩; 19.细砂岩; 20.中砂岩; 21.粗砂岩; 22.砂砾岩; 23.砾岩
Fig. 3. Column section of Early Jurassic Zhenzhuchong Formation, Wenquan, Kaixian county, Sichuan
表 1 珍珠冲组下部、上部喜湿植物与耐旱植物, 喜热植物与广温植物的物种数量及含量
Table 1. Species numbers and percentage of hydrophilous and xerophilous plants and the thermophilous and eurythermic plants in the lower and upper parts of Zhenzhuchong Formation, Sichuan
表 2 珍珠冲早期、晚期由东向西湿度与温度类型及变化
Table 2. Humidity and temperature and their changes from east to west in early and late periods of Early Jurassic Zhenzhuchong Formation, Sichuan
-
[1] 黄其胜. 须家河植物群[A]. 见: 殷鸿福, 杨逢清, 黄其胜, 等. 秦岭及邻区三叠系[C]. 武汉: 中国地质大学出版社, 1992, 77-83, 88-93, 174-179. [2] 黄其胜, 鲁胜梅. 川东地区晚三叠世须家河植物群古生态初探[J]. 地球科学——中国地质大学学报, 1992, 17 (3): 329-335. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX199203016.htm [3] 黄其胜. 川北晚三叠世须家河期古气候及成煤特征[J]. 地质论评, 1995, 41(1): 92-99. https://www.cnki.com.cn/Article/CJFDTOTAL-DZLP199501012.htm [4] 斯行健, 李星学. 中国中生代植物[M]. 北京: 科学出版社, 1963. 1-429. [5] 叶美娜, 刘兴义, 黄国清, 等. 川东北地区晚三叠世及早中侏罗世植物群[M]. 合肥: 安徽科学技术出版社, 1986. 90-94. [6] 斯行健. 陕北中生代延长层植物群[A]. 见: 中国科学院南京地质古生物研究所, 古脊椎与古人类研究所. 中国古生物志139册, 新甲种5[C]. 北京: 科学出版社, 1956. 92-96. [7] 黄其胜. 安徽省沿江一带早侏罗世象山植物群[J]. 地球科学——武汉地质学院学报, 1983, (2): 25-33. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX198302003.htm [8] 黄其胜, 卢宗盛. 鄂东南武昌组早侏罗世植物群[J]. 地球科学——中国地质大学学报, 1988, 13(5): 545-552. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX198805012.htm [9] 黄其胜, 卢宗盛, 黄剑勇. 赣东北早侏罗世林山植物群[J]. 地球科学——中国地质大学学报, 1998, 23(3): 219-224. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX803.000.htm [10] 黄其胜. 长江中下游早侏罗世植物化石垂直分异及其意义[J]. 地质论评, 1988, 34(3): 193-202. https://www.cnki.com.cn/Article/CJFDTOTAL-DZLP198803000.htm [11] Harris T M. The fossil flora of scoresbya sound[J]. East Greenland, V1-V, Medd Om Gronland, 1935, 1937, 112(1-2): 1-176, 1-114. [12] 周志炎. 湘西南早侏罗世早期植物化石[A]. 见: 中国科学院南京地质古生物研究所, 古脊椎与古人类研究所编. 中国古生物志165册, 新甲种7[C]. 北京: 科学出版社, 1984. 1-85. [13] 周志炎. 侏罗纪植物群[A]. 见: 李星学, 编. 中国地质时期植物群[C]. 佛山: 广东科技出版社, 1995. 266-277. [14] 吴舜卿, 叶美娜, 厉宝贤. 鄂西香溪群——晚三叠及早侏罗世植物化石[J]. 中国科学院南京地质古生物研究所所刊, 1980, 14: 124-129.