摘要
根据南海南部巽他陆坡上的柱状剖面SONNE18287的高分辨率的藻类和孢粉记录,探讨海平面变化和其反映的古环境,得到在16.5—13.9kaBP之间,较高的热带低山雨林百分含量和较低的热带低地雨林含量反映了当时仍较低的气温;各类陆相花粉和环纹藻浓度都很高,而沟鞭藻含量很低,说明当时巽他陆架处于低水位环境;13.9—10.2kaBP期间,热带低山雨林含量的减少和热带低地雨林的增加反映了气温的回升;各类陆相花粉和环纹藻浓度都大大降低,而沟鞭藻含量增加,说明巽他陆架逐渐被淹没;10.2—7kaBP热带低山雨林含量的持续减少和热带低地雨林的增加反映了气温继续缓慢回升;花粉浓度的降低说明陆架完全被淹没,花粉的物源区变远,同时环纹藻浓度的略有增加说明此时有淡水注入;7kaBP各类花粉的百分含量相对稳定,说明气温基本稳定,沟鞭藻浓度的突然降低,说明存在一个气候变冷事件使得海平面升高受到抑制,但接下来沟鞭藻浓度又继续回升,指示温度升高,海平面稳定升高。
We present a high-resolution palynology and algae records from sediments of core 18287 on the continental slope of the southern South China Sea, and discuss the sea level changes of South China Sea and its environment. During 16.5--13.9kaBP, there were low percentages of the low-mountain rainforest and high percentages of lowland rainforest, which reflect low temperature, high concentration of all kinds of pollen, spore and Concentricyst, and low concentration of dinoflagellae cyst, which in turn means the sea level of Sunda Shelf was low at that time. During 13. 9--10. 2kaBP, the percentages of the low-mountain rainforest fell and the percentages of the lowland rainforest rose, which show the temperature was increased. The concentration of all kinds of pollen, spore and Concentrieyst decreased greatly, while the concentra-tion of dinoflagellae cyst increased, which indicate Sunda Shelf was submerging slowly. And during 10. 2--7kaBP, the percentages of the low-mountain rainforest fell continually and the percentages of the lowland rainforest rose, which show the temperature was still increased. The distinct reduction of the concentration of pollen and spores shows the complete submergence of Sunda Shelf and the increase of the distance between the source area and the slope. And the little increase of Concentricyst indicates the input of fresh water. At the time of 7kaBP, the stability of the percentages of the low-mountain rainforest and the lowland rainforest shows the climate was just like the previous time. The abruptly decrease of the concentration of dinoflagellae cyst indicates a cold period occurred in the early Holocene and the rising sea level was restrained. The increase of the concentration of dinoflagellae cyst marked the rising temperature and the continuing rising sea level.
出处
《古生物学报》
CAS
CSCD
北大核心
2008年第3期313-318,共6页
Acta Palaeontologica Sinica
关键词
孢粉
藻类
海平面
巽他陆坡
pollen and spore,algae,sea level,Sunda slope
