摘要
根据五大连池地区 4个钻孔剖面孢粉分析研究结果 ,从下往上划分 3个孢粉组合带。Ⅰ组合带木本植物花粉中 90 %以上是第三纪常见分子 ,并以裸子植物花粉高含量为特征 ,草本植物花粉体积分数均超过 2 0 %,且类型也比较多 ,时代定为渐新世比较合适 ;Ⅱ组合带木本植物花粉主要以桦木科花粉为主 ,针叶树种花粉极少 ,与山东山旺中新世孢粉组合特征相似 ,时代应为中新世 ;Ⅲ组合带以草本植物花粉高含量为特征 ,与大同盆地晚新生代孢粉组合带Ⅲ相似 ,时代为更新世。值得提出的是 ,Ⅰ组合带底部火山岩上下均有丰富的孢粉化石 ,这对重新认识五大连池火山岩的喷发时代有一定的参考价值。
spore-pollen assemblages from 4 drills were established from bottom to top in the Wudalianchi area, Heilongjiang province. Assemblage Ⅰ is characterized by abundant common elements of Tertiary (>90%) and high percentage of Gymnosperm pollens. The herbaceous pollens of many types exceed 20% of the total pollens. Thus, the Assemblage Ⅰ is Oligocene in age. The woody plant pollens of Assemblage Ⅱare mainly of Betulaceae, Coniferous plant pollens are rare. The age of Assemblage Ⅱ is Miocene epoch, its characters are similar to that of Miocene spore-pollen Assemblage in Shanwang, Shandong province. Assemblage Ⅲ is characterized by high percentage of herbaceous plant pollens, just as the late Cenozoic spore-pollen assemblage (Ⅲ) of Datong basin, Shanxi province. Its age is Pleistocene. The most remarkable thing is that abundant spores and pollens beneath and above the volcanic bed of Assemblage Ⅰ. It is hoped that this field evidence will provide valuable information for re-definition the eruptive age of Wudalianchi volcano.
出处
《长春科技大学学报》
CSCD
北大核心
2001年第4期313-316,共4页
Journal of Changchun University of Science and Technology
基金
中国科学院长春地理所湿地环境开放实验室资助项目
关键词
孢粉组合
渐新世
更新世
五大连池地区
黑龙江
喷发时代
spore-pollen assemblage
Oligocene and Pleistocene
Wudalianchi area
Heilongjiang province
