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地质学报  2007 

西藏阿里札达盆地上新世-早更新世的古植被、古环境与古气候演化

Keywords: 西藏札达,上新世―早更新世,孢粉记录,古生物,古环境与古气候

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Abstract:

本文将西藏札达盆地河湖相地层重新划分为第四系下更新统香孜组(Qp1-1x)、新近系上新统古格组(N22g)和上新统托林组(N21t)。河湖相地层的古地磁法和ESR法测年结果表明,札达盆地内河湖相沉积地层的形成时代为新近纪上新世―第四纪早更新世。根据该套河湖相地层沉积演化和其中的孢粉组合特征、河湖相沉积中所发现的各种古动植物化石等的综合分析,笔者对札达盆地上新世―早更新世的古植被、古环境与古气候演变进行了探讨。结果表明,札达地区上新世―早更新世气候经历了从湿热―温暖潮湿―偏冷潮湿―寒冷干旱的变化,以及植被从森林―灌木―草原的逐渐演化。可将札达盆地上新世―早更新世环境演化划分为7个大的阶段,其总体特征是15.4~4.4Ma,札达地区处于亚热带湿热气候环境;24.4~3.95Ma,为暖温带温暖潮湿气候;33.95~3.5Ma,为偏凉潮湿阶段,气候开始转冷;43.5~3.2Ma,为温暖潮湿阶段;53.2~2.9Ma,气候转为偏冷潮湿阶段;62.9~2.57Ma,该阶段气候偏冷而干旱,整体较为干冷;72.57~1.36Ma,气候寒冷而干旱。表明自上新世―早更新世,该区的古气候环境在逐渐变干、变冷的总趋势上,经历了多次明显的冷暖与干湿波动。

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