冰川周期驱动oceanic crust生产的变化
Glacial cycles drive variations in the production of oceanic crust
摘要：
冰川循环在海洋和大陆之间重新分配水，导致上地幔的压力变化，从而导致地球内部融化。利用上新世-更新世海平面变化作为强迫函数，包括熔体输送在内的洋中脊动力学理论模型预测了数百米地壳厚度的时间变化。来自澳大利亚-南极海脊的新水深测量显示，在米兰科维奇周期23、41和100千公里附近有显著的光谱能量，与模型预测一致。这些结果表明，深海丘陵是地球上最常见的测深特征之一，它记录了岩浆对海平面变化的反应。这些模型和数据支持记录在海底测深结构中的表层冰川循环与深层地幔融化之间的联系。
英文摘要：
Glacial cycles redistribute water between oceans and continents causing pressure changes in the upper mantle, with consequences for melting of Earth's interior. Using Plio-Pleistocene sea-level variations as a forcing function, theoretical models of mid-ocean ridge dynamics that include melt transport predict temporal variations in crustal thickness of hundreds of meters. New bathymetry from the Australian-Antarctic ridge shows significant spectral energy near the Milankovitch periods of 23, 41, and 100 ky, consistent with model predictions. These results suggest that abyssal hills, one of the most common bathymetric features on Earth, record the magmatic response to changes in sea level. The models and data support a link between glacial cycles at the surface and mantle melting at depth, recorded in the bathymetric fabric of the sea floor.
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