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地质论评  2012 

柴达木盆地大浪滩梁ZK02孔的磁性地层及其古环境研究

Keywords: 柴达木大浪滩,磁性地层,青藏高原隆升,环境变化

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Abstract:

对柴达木盆地西部大浪滩盐湖梁ZK02孔岩芯进行详细的磁性地层研究，确定钻孔岩芯的B―M界线位于315m，Jaramillo位于405~430m，Olduvai位于772~816m。在磁性年代学框架基础上，以蒸发岩沉积序列作为主要依据，结合碎屑岩变化以及孢粉分析，认为该地区在第四纪发生过三次较大的沉积环境变化，分别发生在2？5~2？2Ma，1？2~0？7Ma与0？4Ma。青藏高原第四纪的隆升是造成上述三次变化的主要原因，其中早更新世末―中更新世早期的隆升对柴达木盆地的气候影响较大，导致柴达木盆地的气候由温凉湿润转换为寒冷干旱。高原隆升引起的气候干旱并非简单的逐渐加剧，而是早更新世末期以来，气候湿润期表现得更为湿润，这种现象可能由高原隆升增加了夏季风的强度导致，冰川和积雪面积的增大也起到了叠加效应。

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