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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 >The dense root of the Iceland crust
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The dense root of the Iceland crust

机译：冰岛地壳的致密根

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Bathymetry and topography in the North Atlantic Ocean around Iceland are compared to estimates of crustal thickness in the area. Iceland lies much lower than expected based on crustal thickness. This suggests an anomalously low density contrast between crust and mantle beneath Iceland [W. Menke, Geophys. Res. Lett. 26 (1999) 1215-1218]. The relationship between bathymetry and depth to Moho along ridges adjacent to Iceland suggests a normal density contrast there. Continuity of this relationship leads to the conclusion that most of the change occurs in the crust, i.e. the abnormally low density contrast between crust and mantle within Iceland is primarily due to a heavy crust, not light mantle. Gravity modeling also requires the average density of the crust to be unusually high. I argue that this is in fact not abnormal. The lower crust in Iceland is denser because of a higher degree and/or depth of melting beneath Iceland than at adjacent ridges, because of phase transformations occurring within the thick crust and possibly due to fractionation processes in the crust.
机译：将冰岛周围北大西洋的测深和地形与该地区地壳厚度的估计值进行了比较。冰岛的地壳厚度远低于预期。这表明冰岛下面的地壳与地幔之间反常的密度反常低。 Menke，地球物理。 Res。来吧26（1999）1215-1218]。在与冰岛相邻的山脊上，测深法与莫霍面深度之间的关系表明那里的密度反差正常。这种关系的连续性得出的结论是，大多数变化都发生在地壳中，即冰岛内部地壳与地幔之间密度反差异常低的主要原因是地壳重而不是地幔轻。重力建模还要求地壳的平均密度异常高。我认为这实际上并非异常。冰岛下部的地壳较致密，这是因为冰岛之下的融化程度和/或深度比相邻山脊处的融化程度更高，这是由于在厚地壳内发生了相变并且可能是由于地壳内的分馏过程所致。

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