| 北京顺义早更新世有孔虫动物群的古生态及古环境 |
| |
| 引用本文： | 林景星.北京顺义早更新世有孔虫动物群的古生态及古环境[J].地质科学,1981,0(1):55-59. |
| |
| 作者姓名： | 林景星 |
| |
| 作者单位： | 中国地质科学院地质研究所 |
| |
| 摘 要： | 1975年我们报道了泥河湾盆地怀来及蔚县境内发现半咸水有孔虫化石,当时认为它们的层位可能属第四系上部,后来进一步工作证实应是泥河湾组上部沉积。1977年我们对华北平原第四纪海进海退现象作了初步报道,认为华北平原在早更新世时发生过海进(渤海海进),并引用陈方吉在北京东南发现海相介形虫资料,说明早更新世渤海海进时海水曾经到达这一地区。1978年李鼎容等在北京市顺义县早更新世地层中发现大量有孔虫化石。进一步证实北京地区早更新世确曾发生过海进,使我们解释怀来及蔚县所发现的半咸水有孔虫来源,有更多证据。这一发现,对于北京地区第四纪地层划分对比、新构造运动判别和古地理恢复有重大意义。
|
| 关 键 词： | , |
| 收稿时间： | 1980-01-21 |
| 修稿时间： | 1980-01-21; |
PRELIMINARY NOTES ON PALAEOECOLOGY,PALAEOCLIMATE AND PALAEOGEOGRAPHY OF EARLY PLEISTOCENE FORAMINIFERAL FAUNA IN SHUNYI COUNTY,BEIJING PLAIN |
| |
| Lin Jingxing.PRELIMINARY NOTES ON PALAEOECOLOGY,PALAEOCLIMATE AND PALAEOGEOGRAPHY OF EARLY PLEISTOCENE FORAMINIFERAL FAUNA IN SHUNYI COUNTY,BEIJING PLAIN[J].Chinese Journal of Geology,1981,0(1):55-59. |
| |
| Authors: | Lin Jingxing |
| |
| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing |
| |
| Abstract: | In 1978,abundant foraminiferal fossils have been discovered in Lower Pleistocene Xiadian Formation,Shunyi County,Beijing plain.The major foraminifera are Paromalina bilateralis,Cibicides spp.,Cassidulina spp.,Trifarina angulosa,Neoglobo-quadrina pachyderma,Globigerina bulloides,G. inflata and so on They are not only comprised of cold-water elements,but also warm-water ones,hence this foraminiferal fauna is not a simple mixture of cold-water and warm-water elements,but a distinct ecologic group,of which,the Neogloboquadrina pachyderma are mainly dextral and their ecophenotypes are comparatively multiple.Therefore,this foraminiferal fauna in not a cold-water population,instead,it is a comparatively warm-water population,equivalent to the foraminiferal fauna in the southern transitional zone of the N.Pacific Ocean with the exception of subtropical zone.We infer its palaeo-water temperature to be slightly colder than that of recent Bohai Bay.Its climatic environment probably belongs to warm-temperate zone,and its atmospheric temperature may be a little lower than present.The planktonic foraminifera made up 35 percent among the foraminiferal fauna,and deep-water species are predominate among over the benthonic foraminifera,such as Trifarina angulosa,Paromalina bilateralis etc.,while shallow-water species,as Ammonia beccarii have not been discovered yet.Viewed from the conditions mentioned above,it is obvious that the Palaeo-Bohai outlet should be widder and deeper than that at present and consequently,marine water should have transgressed up to the Beijing Plain. |
| |
| Keywords: | , |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质科学》浏览原始摘要信息 |
| 点击此处可从《地质科学》下载免费的PDF全文 |
|
