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在洋中脊环境,壮观的熔岩流坡支认为是不可能的。这并不是熔岩流不存在于大洋上部岩石圈;相反,深海钻井和蛇绿岩套研究已经表明,虽然洋壳剖面的层2A(紧接在层1沉积物层之下的火成岩层)普遍包含有枕状熔岩,但它表现为沉积物和席状熔岩流的互层。可是,这种岩流往往被说成是小规模的,是局部喷发的产物。由于海水的快速冷却,这种产物不能流得很远。例如,在加拉帕戈斯中隆,最大的席状岩流距喷发中心的距离看来不大于7公里。
In the mid-ocean ridge environment, the spectacular lava flow is not considered as possible. This is not because lava flows do not exist in the upper oceanic lithosphere. In contrast, deep-sea drilling and ophiolite casing studies have shown that although layer 2A (an igneous layer immediately below layer 1 sediment) in the oceanic crust generally contains There is pillow-shaped lava, but it appears as an interbedded layer of sediment and mantle flow. However, this rock flow is often said to be small-scale and is a product of local eruptions. Due to the rapid cooling of seawater, this product can not flow very far. For example, in the Galapagos middle dragon, the largest seeded rock flow does not appear to be more than 7 kilometers from the eruption center.