新疆罗布泊LB剖面全新世沉积物粒度特征及环境意义

摘要

新疆罗布泊LB剖面揭示了该区全新世沉积地层。对剖面沉积物粒度的分析结果表明，罗布泊LB剖面沉积物以中细砂为主，风尘层理明显，沉积物来源较为单一，颗粒含量及大小反应出全新世以来尘暴作用强弱波动不定，但总体上呈缓慢加强的趋势，揭示出罗布泊全新世以来环境经历了由冷湿向暖干过度的阶段，气候总体变得恶劣，期间偶有缓和。%XinJiang lop nur LB section recover the formation of Holocene.Analying sediment particle size,we found that lop nur LB sedi- ment was made of fine sand mainly and,bedding obviously,setimentary source is simple,particle contents and size can show the intension of dust effect from Holocene.However, this trend was gentle,these phenomenon recover environment in this area was changed from wet and cold to dry and warm,climate became worse and relieved occasionally.