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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Tomographic evidence for a narrow whole mantle plume below Iceland
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Tomographic evidence for a narrow whole mantle plume below Iceland

机译：断层扫描的证据表明，冰岛下面有完整的地幔柱

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摘要

Iceland is known to be a centre of both hotspot and Mid-Atlantic Ridge activity. A plume origin for the hotspot has been suggested by observational, laboratory and numerical investigations as well as by several seismological studies. The latter have, however, not yielded a detailed image of the entire mantle volume below Iceland. We present tomographic images of a narrow low velocity anomaly below Iceland, extending from the core-mantle boundary to the surface. From these images we infer a bent plume with a diameter <= 500 km, rising from a broad root zone (> 1000 km) and culminating in a plume top with a diameter of approx 1200 km. The anomaly amplitude can, if only controlled by temperature, be converted into excess temperatures in the upper and lower mantle of the order of 200-300 K and approx 200 K, respectively. The wavy shape of the anomaly together with its lateral branches, may indicate that the position of the Iceland hotspot is not stationary.
机译：冰岛是热点和大西洋中脊活动的中心。通过观察，实验室和数值研究以及一些地震学研究已经提出了该热点的羽状流起源。但是，后者没有提供冰岛下面的整个地幔体积的详细图像。我们提供了从冰岛-幔幔边界一直延伸到地表以下冰岛以下低速狭窄异常的断层图像。从这些图像中，我们推断出直径<= 500 km的弯曲羽状流，是从宽阔的根部区域（> 1000 km）升起并最终达到直径约1200 km的羽状顶部。如果仅通过温度控制，则异常幅度可以分别转换为上地幔和下地幔中大约200-300 K和大约200 K的过量温度。异常的波浪形状及其横向分支可能表明冰岛热点的位置不是固定的。

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