Stratigraphic Evidence for the Uplift of the Tibetan Plateau between ∼1.1 and ∼0.9 myr Ago
Stratigraphic Evidence for the Uplift of the Tibetan Plateau between ∼1.1 and ∼0.9 myr Ago
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DOI：
10.1006/qres.2000.2170
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发表时间：
2000-11
影响因子：
2.3
通讯作者：
Jimin Sun;Tung-sheng Liu
中科院分区：
文献类型：
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作者：
Jimin Sun;Tung-sheng Liu
青藏高原的隆起不仅表现在大范围的剥蚀，而且还表现在离剥蚀区较远或较近的沉积物沉积速率的增加。我们的研究结果表明，风成尘的质量积累率（MAR）增加之间的1.1和1.9亿年前。我们认为这一时期MAR和中值粒度的增加与青藏高原及其邻近地区的隆升有关。这种中更新世的隆升也可以通过边缘地区火山活动的年代、隆升高原周围厚砾岩沉积的存在以及柴达木盆地（青藏高原东北部）湖泊沉积物沉积速率的增加来证明。黄土记录与海洋记录之间的相关性表明，在1090万年前，这两个记录之间的相关性很好。这种良好的相关性可能表明，中更新世隆升事件不仅使高原进入冰冻圈，而且通过对冰川研磨、岩石剥蚀和东亚季风环流的影响，增强了区域尺度黄土输移和沉积与全球冰量变化的耦合。
Uplift of the Tibetan Plateau is manifest not only in widespread denudation, but also by an increased deposition rate of sediment, near or far from the exhumed regions. Our results indicate that the mass accumulation rate (MAR) of eolian dust increased between ∼1.1 and ∼0.9 myr ago. We associate this increase in MAR and median grain size with uplift of the Tibetan Plateau and its adjacent regions during this period. This Middle Pleistocene uplift can also be evidenced by the age of volcanism in the marginal region, the existence of thick conglomerate deposits surrounding the uplifted plateau, and the increased sedimentation rate of lacustrine deposits in the Qaidam Basin (northeastern Tibetan Plateau) between ∼1.1 and ∼0.9 myr ago. The correlation between the loess and marine records indicates that after ∼0.9 myr ago, these two records correlate well. This good correlation probably suggest that the Middle Pleistocene upheaval event not only brought the plateau into the cryosphere, but also enhanced the coupling of regional-scale Chinese loess transportation and deposition to the global ice volume variations through its effects on glacial grinding, rock denudation, and east Asian monsoonal circulation.