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甘肃省临夏盆地更新世早期湖泊沉积孢粉记录的古气候演化

DOI: 10.3969/j.issn.1001-7410.2011.01.14, PP. 104-111

Keywords: 孢粉组合,临夏盆地,早更新世,古气候

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Abstract:

根据孢粉组合特征,将临夏盆地早更新统东山组(2.50~1.76Ma)的孢粉划分为3个孢粉带(含6个亚带),即3个植被、气候阶段:第一阶段(2.50~1.91Ma,带Ⅰ),植被类型是以柏科、榆属和禾本科为优势种的温带森林,气候表现为温凉稍干,并有逐渐干旱化的趋势。第二阶段(1.91~1.80Ma,带Ⅱ)是以云杉属、榆属和禾本科为主的温带森林,气候冷湿;尤其在1.89~1.87Ma期间,云杉林面积最大,气候最为湿润;第三阶段(1.80~1.76Ma,带Ⅲ),植被类型为以云杉属、梣属和禾本科为主的温带森林,云杉林面积逐渐减小,禾本科逐渐增加,气候逐渐干旱。

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