RECORD OF PALEOENVIRONMENTAL CHANGES IN PINGDINGCUN SECTION, HEBEI PROVINCE
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摘要: 对河北省阳原盆地平顶村剖面的野外观察、孢粉分析及14C测年,作者认为,该剖面的地质时代为晚更新世晚期至全新世早期。依据Fe3+/Fe2+值估计古温度并结合CaCO3含量变化分析,该区自晚更新世晚期至全新世早期,古气候经历了温凉湿润→寒凉偏干→寒冷湿润→温凉干燥的变化过程;孢粉组合特征反映植被曾经历森林植被和森林草原植被的演化。Abstract: From field observation, sporopollen analysis and 14C dating of samples collected from the Pingdingcun Section, Hebei province, the sediments involved are determined to have formed from Late Pleistocene to Early Holocene.According to an estimate of the temperature then prevailing by Fe3+/Fe2+ ratio and an analysis of the change of CaCO3 content, the paleoclimate of the Yangyuan area has obviously experienced four stages in the period, i.e. warm-humid, cold-dry, cold-humid and warm-dry stages.The sporopollen assemblages reflect that a change in vegetation from forest to grass land has occurred.
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Key words:
- Yangyuan County /
- Pindingcun Section /
- paleoclimatic change
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