Dike Injection and the Formation of Megaplumes at Ocean Ridges
Dike Injection and the Formation of Megaplumes at Ocean Ridges
复制标题
堤坝注入和洋脊巨羽的形成
DOI：
10.1126/science.267.5205.1804
复制
发表时间：
1995
期刊：
影响因子：
56.9
通讯作者：
L. Germanovich
中科院分区：
文献类型：
--
作者：
R. Lowell;L. Germanovich
一个简单的水文模型的海水环流在洋脊轴意味着大量的浮力，热水在海洋水柱（megapulums）的瞬时发生可以归因于在洋壳中的堤防的就位。对于产生大羽流的堤坝，补给区和上流区的渗透率必须大于普通黑烟所需的渗透率。在上升流区的渗透率增加了几个数量级的结果，从堤坝的安置，和megapulus排放停止作为堤坝冷却。强烈的黑烟排放可能不会持续很长时间在一个大羽流现场后，事件发生。
A simple hydrologic model of seawater circulation at ocean ridge axes implies that the transient occurrence of large volumes of buoyant, heated water in the oceanic water column (megaplumes) can be attributed to the emplacement of dikes in oceanic crust. For dikes to generate megaplume flow, the permeability of both the recharge areas and the upflow zone must be greater than that required for ordinary black smokers. An increase in permeability in the upflow zone by several orders of magnitude results from dike emplacement, and megaplume discharge ceases as the dike cools. Vigorous black smoker venting may not persist very long at a megaplume site after the event occurs.