Lake tectonics in Tibet : uplift of lake shorelines and estimates of lower crustal viscosity

试图解释青藏高原整体形态和生长的模型通常假设中地壳存在一个低粘性层。为了测试这一模型，在纳木错周围进行了GPS测量，以确定湖泊海岸线的高度。结合~(14)C测年结果，我们发现在过去的10,000年中，南湖的水位下降了20米。如果所提议的低粘层确实存在，那么随着水位的降低，海岸线应该会相应地抬升。然而，这种抬升没有被认识到，这意味着西藏以下任何低粘层的分布和存在都需要重新检查。

Models that try to account for the overall morphology and the growth of the Tibetan Plateau commonly assume the presence of a low viscosity layer in the mid crust. To test this model, GPS measurements were made around Lake Nam Co to determine the heights of lake shorelines. In combination with the results of 14C dating, we show that the water level in L. Nam Co has fallen 20 m in the past 10,000 years. If the proposed low viscosity layer does in deed exist, there should be a corresponding uplift of the shorelines as the water level decreases. However, such uplift was not recognized implying that the distribution and presence of any low viscosity layer beneath Tibet needs to be reexamined.