| 湖南凤凰寒武纪Fischer点图及其意义 |
| |
| 引用本文： | 徐世球.湖南凤凰寒武纪Fischer点图及其意义[J].地球科学,1997,22(5):511-514. |
| |
| 作者姓名： | 徐世球 |
| |
| 作者单位： | 地球科学学院 |
| |
| 基金项目： | 国家基础性研究重大项目“中国古大陆及其边缘层序地层及海平面变化研究（SSLC）”资助 |
| |
| 摘 要： | 湖南凤凰早寒武世为外陆棚环境，中、晚寒武世为台缘斜坡，经过一定校正编绘的Ｆｉｓｃｈｅｒ点图获得的海平面变化曲线显示寒武纪全球海平面上升的趋势，海洋可容空间不断加大，这与三叶虫演经有耦合关系，早寒武世区域性三叶虫多，生物分区明显，三叶虫带不能进行洲际对经，晚寒武世则相反，两个重要海进面（５３６Ｍａ和５１７．２Ｍａ）是统间界线最佳线点，与北美Ｒ２曲线比较可确认５１５－５１７Ｍａ 寒武大海泛期（长山期内
|
| 关 键 词： | Fischer点图 寒武纪地层 海平面变化 |
THE BEST LOCATION OF MIDDLE-UPPER CAMBRIAN DEMARCATION LINE FROM CAMBRIAN SEQUENCE FRAMEWORK IN THE WESTERN HUNAN |
| |
| Yang Jialu.THE BEST LOCATION OF MIDDLE-UPPER CAMBRIAN DEMARCATION LINE FROM CAMBRIAN SEQUENCE FRAMEWORK IN THE WESTERN HUNAN[J].Earth Science-Journal of China University of Geosciences,1997,22(5):511-514. |
| |
| Authors: | Yang Jialu |
| |
| Abstract: | The traditional demarcation line between Middle-Upper Cambrian ( A.pisiformis Z/ L.laevigata Z) is on the low sea level at the overlapping location of second and third-order sequence interface which influenced the migration of living beings. Thus, it is difficult for global correlation.While the new demarcation line is between G, r, a zone and G, r, r zone, which is a large transgression at the overlapping location of second and third-order sequence transgression levels, and also the largest transgression period of Cambrian. It is an important stage of organic evolution and also produces floating Agnostids which has global correlational significance. |
| |
| Keywords: | demarcation line between Middle-Upper Cambrian sequence framework western Hunan |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
| 点击此处可从《地球科学》下载免费的PDF全文 |
