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通过对西藏吉隆盆地沃马剖面上变价元素Fe、Mn的赋存形态分析,根据变价元素不同赋存形态含量与古气候的关系,探讨青藏高原隆升过程中的环境变迁历程.应用元素地球化学原理,参考常规常量元素指标和测年资料,确定了该剖面10.0～1.7Ma来地球化学元素的分布规律.研究结果表明:该剖面地层沉积时的地球化学环境历经强还原状态到弱氧化状态再到还原状态的变化过程,其对应古气候呈现由干冷转向暖湿再到干冷的变化.
Based on the occurrence patterns of Fe and Mn in the Wah Ma section of the Geelong Basin in Tibet and the relationship between the different speciation of altered elements and paleoclimate, the paper discusses the process of environmental change during the uplift of the Qinghai-Tibet Plateau. Using elemental geochemistry Principle and reference to conventional constants and dating data, the distribution regularity of geochemical elements in the section from 10.0 to 1.7 Ma was determined.The results show that the geochemical environment during the deposition of this section undergoes strong reduction to weak oxidation To the change of the state of the process of change, the corresponding paleoclimate showed a change from dry and cold to dry and warm to dry and cold changes.