SPOROPOLLEN AND ALGAE ASSEMBLAGES IN DEEP-SEA SEDIMENTS IN THE SOUTH CHINA SEA AND PALEOCLIMATE AND PALEOENVIRONMENT RECORDED IN THEM
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摘要: 对南海149站和323站深海柱状剖面进行了孢粉与藻类研究,根据孢粉成分的变化将南海149站从下至上划分了4个孢粉组合带,依次为:1带:Pinus-Quercus(常绿)-Umbellferae-Gramineae-Pteris孢粉带(407~270 cm);2带:Dacrydium-Quercus-Cyathea-Pinus-Polypodiaceae孢粉带(270~105 cm);3带:Pinus-Polypodiaceae-Quercus(常绿)-Pteridium孢粉带(105~30 cm);4带:Gleditsia-Cyathea-Pinus-Polypodiaceae孢粉带(30~0 cm)。323站也划分了4个孢粉带,与149站进行了比较研究。并相应恢复了南海东部7.5万年以来4个植被、气候、古环境演替阶段,结合氧同位素测年资料,对149站和323站柱状地层时代划分作了讨论,为南海古植被、古气候、古环境演变研究提供科学依据。Abstract: Palynological research of deep-sea sediments in the South China Sea has been carried out. Based on the sporopollen and algae assemblages of the deep-sea sediments in cores 149 and 323 in the South China Sea, four sporopollen zones of core 149 have been distinguished in ascending order:Zone 1(407~270 cm):Pinus-Quercus(evergreen)-Umbellferae-Gramineae-Pteris;Zone 2(270~105 cm):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).Core 323 also has 4 assemblages. Comparison of palynological zone,palaeoclimate, stratigraphy and oxygen isotope of cores 149 and 323 in the South China Sea is done. The sporopollen zones reflect four stages of vegetation, climate and paleoenvironment evolution of the South China Sea since 75 000 years ago. Combined with oxygen isotope dating, the sporopollen and algae data can give scientific evidences for stratigraphic division and reconstruction of paleoclimate and paleoenvironment in the South China Sea.
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Key words:
- core 149 /
- core 323 /
- sporopollen /
- algae /
- paleoclimate
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