摘要
相距3-20km的岭头、罾口河、俵口和空港物流中心4 处埋藏牡蛎礁体的年代学研究证实,开始发育的时间不同,但同时在4.2-4.0kacalBP时结束建礁,即其灭亡与“4.2ka事件”在时间上重合.岭头、罾口河剖面〇稳定同位素和罾口河剖面孢粉数据进一步表明,4.5-4.3ka cal BP时研究区气候出现变冷变干的趋势,4.3-4.2ka cal BP逐渐好转,推测这一气候波动变化过程可能是对“4.2ka事件”的响应.
AMS ,4C dating revealed that initiation timing of the four buried oyster reefs, Lingtou, Zengkouhe, Biaokou and Airport Lo-gistic Center, 3～20km apart from each other, was different but the reef building-up at the four sites were almost simultaneously fin-ished by accumulation of the thick muddy sediments at 4.2～4.0ka cal BP or so, which coincided with the 44.2ka eventFurthermore, oxygen isotope study of the endogenic carbonate mud taken from the interior of the articulated oyster shells and the overlying muddy sediments in Zengkouhe and Lingtou profiles and pollen analysis from the same sampling positions were carried out. Both results indi-cate that the local climate condition tended to be cold and dry during the period of 4.5～4.3ka cal BP and then began to ameliorate in 4.3～4.2ka cal BP. The authors hold that this climate fluctuation was probably a response to the ‘4.2ka event’ in the study area.
出处
《地质通报》
CAS
CSCD
北大核心
2016年第10期1614-1621,共8页
Geological Bulletin of China
基金
中国地质调查局项目(编号:12120113005800,12120100600015008)
国家自然科学基金项目(批准号:41476074)
