南海东部深海沉积中的孢粉研究及其古环境意义

Sporopollen Research on Deep-Sea Sediments in the Eastern South China Sea and Its Paleoenvironment

通过对南海东部149站深海柱状剖面的孢粉、藻类研究,根据孢粉成分的变化将该孔沉积层从下至上划分为4个孢粉组合带。1带:Pinus-Quercus(常绿)-Umbellferae-Gramineae-Pteris孢粉带(407～270cm);2带:Dacrydium-Quercus-Cyathea-Pinus-Polypodiaceae孢粉带(270～105cm);3带:Pinus-Polypodiaceae-Quercus(常绿)-Pteridium孢粉带(105～30cm);4带:Gleditsia-Cyathea-Pinus-Polypodiaceae孢粉带(30～0cm)。并相应恢复了南海东部7.5万a以来4个植被、气候、古环境演替阶段:热带北缘半常绿季雨林、热带季雨林、热带北缘半常绿季雨林和热带季雨林。结合氧同位素测年资料,对149站柱状地层时代作了划分。

Based on the sporopollen and algae research of the deep-sea sediments at core 149 in the eastern South China Sea, four sporopollen zones have been distinguished in ascending order： Zone 1 （ 407-270 cm ）： Pinus-Quercus （ evergreen ）-Umbellferae-Gramineae-Pteris; Zone 2 （ 270-105cm ）： Dacrydium-Quercus- Cyathea-Pinus-Polypodiaceae; Zone 3 （ 105-30 cm ）： Pinus-Polypodiaceae-Quercus （ evergreen ）- Pteridium; Zone 4 （ 30-0 cm ）： Gleditsia-Cyathea-Pinus-Polypodiaceae （ 30-0 cm ）. The sporopollen zones reflect four stages of vegetation, climate and paleoenviornment evolution of the South China Sea since 75 000 years ago. Combined with oxygen isotope dating, the sporopollen and algae data can be as one of science evidences for stratigraphic division and reconstruction of paleoclimate and paleoenvironment in the South China Sea.