安徽南陵盆地早第三纪孢粉组合及其地质意义

PALEOGENE SPORO-POLLEN ASSEMBLAGES OF NANLING BASIN IN ANHUI PROVINCE AND THEIR GEOLOGICAL SIGNIFICANCE

张玉兰 王开发 王永元 王家文 王蓉 王从风 钱少华

Zhang Yulan Wang Kaifa Wang Yongyuan Wang Jiawen Wang Rong Wang Congfeng Qian Shaoixua

南陵盆地双塔群分为四个孢粉组合:(1)双塔群二段化石组合属上新统一下始新统,为稍干的热带、亚热带气候;(2)双塔群三段化石组合属中、上始新统,为略干的南亚热带气候;(3)双塔群四段下部化石组合属下渐新统,为温湿的亚热带气候;(4)双塔群四段上部化石组合属中、上渐新统,为温湿的北亚热带气候。

Lots of fossil spore and pollen grains are obtained from Zk,Zk and Zk wells in Nanling Basin,Anhui Province.The Paleogene sporo-pollen may be divided into 4 assemblages in ascendant order:1.The .herici-Ulmipollenites-Rhoipites assemblagein the second member of the Shuangta group of the Upper Paleocene-Lower Eocene is characterized by the dominance of Fagaceae and Ulmaceae,showing a vegetational landscape of the broad leaf forest and a little dry tropicalsubtropical climate.2.The assemblage in the third member of the Shuangta Group of the Middle and Upper Eocene is dominanted by angiospermae,indicating a vegetational landscape of the coniferous and broad lear mixed forest,showing warm-hot and a little dry southern subtropical climate.3.The assemblage in the lower part of the fourth member of the Shuangta Group of the Lower Oligocene is dominanted by Txodiaceae,Pinaceae and Laricoidites,which represents the coniferous and broad leaf mixed forest of warm and moist subtropical climate.4.The assemblage in the upper part of the fourth member of the Shuangta Gooup of the Middle and Upper Oligocene is dominented by the deciduous broad leaved trees,showing a vegetational landscape of the coniferous and broad leaf mixed forest in a warm and humid northern subtropical climate.

10.11743/ogg19860109