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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 >Structure of the crust and uppermost mantle of Iceland from a combined seismic and gravity study
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Structure of the crust and uppermost mantle of Iceland from a combined seismic and gravity study

机译：结合地震和重力研究的冰岛地壳和最上层地幔结构

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摘要

We present a map of the depth to the base of the upper crust and the total crustal thickness across Iceland constrained by seismic refraction results, receiver function analysis and gravity modelling. Upper crustal thicknesses (as defined by O.G. Flovenz, J. Geophys. 47 (1980) 211-220) lie in the range of approximately 2-11 km, with the thinnest upper crust below active and extinct central volcanoes and the thickest upper crust close to the flanks of the rift zones. The thickest crust (40-41 km) lies above the centre of the Iceland mantle plume, where active upwelling and high mantle temperatures enhance melt production. Thick crust (～35 km) is also found in eastern Iceland, between the current plume centre and the Faroe-Iceland Ridge. Elsewhere, the crust thins away from the plume centre. The thinnest crust (≤20 km) is found in the active rift in the northern part of the Northern Volcanic Zone, where melt production has been affected by a ridge jump, and in the far southwest of Iceland. The uppermost mantle below Iceland is characterised by reduced densities below the rift zones, suggesting higher mantle temperatures and the possible presence of partial melt in these regions.
机译：通过地震折射结果，接收器功能分析和重力模拟，我们给出了冰岛上地壳底部深度和整个地壳总厚度的地图。上地壳厚度（由OG Flovenz，J. Geophys。47（1980）211-220定义）在大约2-11 km范围内，最薄的上地壳在活跃和灭绝的中央火山下面，最厚的上地壳关闭到裂谷区的侧面。最厚的地壳（40-41公里）位于冰岛地幔柱的中心上方，活跃的上升流和较高的地幔温度可提高熔体产量。在冰岛东部，在当前羽状中心和法罗-冰岛脊之间，也发现了厚的地壳（〜35 km）。在其他地方，地壳逐渐远离羽状中心。最薄的地壳（≤20 km）位于北部火山区北部活跃的裂谷中，那里的熔体生产受到脊突的影响，并且位于冰岛的西南部。冰岛以下最上层的地幔的特征是裂谷区以下的密度降低，表明这些地区的地幔温度较高，并且可能存在部分融化。

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