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Hydrothermal recharge and discharge across 50 km guided by seamounts on a young ridge flank

机译：在年轻的山脊侧面由海山引导下长达50公里的热液充排

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摘要

Hydrothermal circulation within the sea floor, through litho-sphere older than one million years (Myr), is responsible for 30% of the energy released from plate cooling, and for 70% of the global heat flow anomaly (the difference between observed thermal output and that predicted by conductive cooling models). Hydrothermal fluids remove significant amounts of heat from the oceanic lithosphere for plates typically up to about 65 Myr old. But in view of the relatively impermeable sediments that cover most ridge flanks, it has been difficult to explain how these fluids transport heat from the crust to the ocean. Here we present results of swath mapping, heat flow, geochemistry and seismic surveys from the young eastern flank of the Juan de Fuca ridge, which show that isolated basement outcrops penetrating through thick sediments guide hydrother-mal discharge and recharge between sites separated by more than 50 km. Our analyses reveal distinct thermal patterns at the sea floor adjacent to recharging and discharging outcrops. We find that such a circulation through basement outcrops can be sustained in a setting of pressure differences and crustal properties as reported in independent observations and modelling studies.
机译：通过一百万年（Myr）以上的岩石圈，海床内的热液循环占板块冷却释放的能量的30％，占全球热流异常的70％（观测到的热输出之间的差以及通过传导冷却模型预测的结果）。热液从大洋岩石圈带走了大量的热量，通常板块的年龄可达65 Myr。但是，鉴于覆盖大多数山脊侧面的相对不可渗透的沉积物，很难解释这些流体如何将热量从地壳传递到海洋。在这里，我们展示了胡安德富卡山脊东部年轻侧翼的条幅测绘，热流，地球化学和地震勘测的结果，这些结果表明，穿过厚厚沉积物的孤立基底露头引导着水热排放和补给。 50公里我们的分析揭示了在海床附近，充，排露头附近有明显的热模式。我们发现，通过地下露头的这种循环可以在独立的观测和模型研究中报道的压差和地壳特性的设定中得以维持。

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