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在缓慢和快速移动的板块下方的电动异质性:在上层地幔中的古流?
1Geophysics Institute, University of Göttingen, 37075 Göttingen, Germany. kbahr@uni-geophys.gwdg.de
概括
橄中的扩散解释了上层地幔的导电性. 电动异质性测量表明地幔对流,而不是板块运动,导致费诺斯坎迪亚板块和澳大利亚板块下方的奥利文线对齐.
科学领域:
- 地质物理学 地质物理学
- 矿物物理 矿物物理
背景情况:
- 上层地幔的电导率受到水性橄中散性的影响.
- 气扩散在奥利文中产生异性导电性,其中"a"轴是最导电的.
研究的目的:
- 为了测试板块运动诱导奥利文晶格偏好的方向的假设.
- 为了比较缓慢移动的费诺斯坎迪亚板块和快速移动的澳大利亚板块下面的电动异构.
主要方法:
- 使用了长期电磁阵列测量.
- 在上层地幔中分析了电动异构.
主要成果:
- 与澳大利亚板相比,在Fennoscandian板下方的地幔中观察到更大的橄线对齐.
- 在这两个板块之间,电动异构性模式不同.
结论:
- 橄线对齐的程度可能更多地受到地幔对流的影响,而不是板块运动.
- 这些发现挑战了板块运动与上层地幔中大规模的橄织物之间的直接联系.
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