SEDIMENTARY ENVIRONMENTAL EVOLUTION DURING LAST DEGLACIATION AND EARLY HOLOCENE IN CHAOHU REGION
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摘要: 利用AMS14C对巢湖西岸杭埠河三角洲地区湖相沉积岩心年代的精确测定与校正,以及粒度、磁化率、地球化学元素、总有机碳、总氮以及有机质稳定碳同位素等气候环境代用指标的分析与研究,提取了巢湖地区末次冰消期-早全新世的环境演变信息,重建了研究区13 393~7 486 cal.aBP期间的环境演变序列:(1)13 393~12 420 cal.aBP期间,气候由冷干向温凉发展,降雨量增加,湖泊水位迅速上升,巢湖进入快速发育阶段,但在13 040~12 773 cal.aBP期间出现冷干事件;(2)12 420~11 760 cal.aBP期间,本阶段响应全球性降温事件-YD事件,气候干冷且不稳定,降雨减少,湖泊水位下降,湖盆收缩且水位变迁频繁,湖内浮游植物有所生长;(3)11 760~9 160 cal.aBP阶段气候温和湿润且稳定,雨水充沛,湖泊水位稳定或有所扩张,湖内大型水草类植物繁衍,但在约11 006 cal.aBP出现冷干事件;(4)9 160~7 486 cal.aBP阶段整体气候温凉偏干且波动明显,降水相对减少,湖泊面积收缩,湖内有机质来源以湖内自生的水生植物为主,并在约8 633及8 493 cal.aBP分别遭遇冷干与强降水事件。Abstract: Based on the environmental parameters, such as AMS 14C age, grain size, magnetic susceptibility, geochemical elements, total organic carbon, total nitrogen and organic carbon isotope, extracted from the core sediments of the hole drilled at the Hangbu River Estuary, we reconstructed the environmental evolutionary history for Last Deglaciation and Early Holocene (13 393~7 486 cal.aBP) in Chaohu Region. (1) The region evolved from a cold-dry to a temperate-cool climate during the period from 13 393 to 12 420 cal.aBP and the Chaohu Lake started to develop rapidly with high rainfall and fast rising of lake level, in spite of the cold-and-dry climatic event during 13 040 and 12 773 cal.aBP; (2) The unstable cold and dry paleoclimate during 12 420 and 11 760 cal.aBP with low rainfall and lake level, which is supposed to correspond to the Younger Dryas event, caused the shrinkage and frequent fluctuation of the Chaohu Lake even though the phytoplankton remained survived in the lake; (3) The paleoclimatic environment was mild and humid between 11 760 and 9 160 cal.aBP. With high rainfall and stable lake level, large aquatic plants multiplied in the lake even though there was a cold-and-dry event approximately 11 006 cal.aBP; (4) A warm and dry paleoclimatic environment prevailed between 9 160 and 7 486 cal.aBP with low rainfall and lake level, and the organic matters in the lake were mainly from the phytoplankton. The lake experienced a cold-and-dry event 8 633 cal.aBP. and an anomalous rain-rich event 8 493 cal.aBP.
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Key words:
- environmental evolution /
- the last Deglaciation /
- Early Holocene /
- the Chaohu Region
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