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地质论评  2003 

青海贵德盆地晚新生代沉积演化与青藏高原北部隆升

Keywords: 青海贵德盆地晚新生代沉积演化青藏高原地层学沉积相隆升构造特征

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Abstract:

青海贵德盆地发育巨厚的新生代地层,并含较丰富的重要哺乳动物化石,对确定盆地及周边相似地层的年代和研究高原隆升过程具有重要的科学意义。本文结合哺乳动物采用典型剖面精确古地磁测年为基础的时间框架,对近11MaBP以来盆地沉积相进行了分析,划分出19个沉积岩相和湖泊、三角洲、辫状河流、水下扇三角洲和水上洪积扇5个沉积环境,以及8个沉积演化阶段。通过盆地沉积对构造隆升的响应探讨表明:>11~7.65MaBP为高原构造稳定期,7.65~3.6MaBP高原具阶段性逐步隆升构造特征,3.6~>2.6MaBP为高原整体快速隆升,2.6MaBP左右高原大规模挤压断陷,1.8MaBP左右高原大规模整体快速隆升并使贵德盆地古湖被切穿排干,黄河在此诞生。

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