超慢扩散的莫恩斯山脊的深度电图
Ståle Emil Johansen1, Martin Panzner2, Rune Mittet2
1Department of Geoscience and Petroleum, Norwegian University of Science and Technology (NTNU), Trondheim, Norway. stale.johansen@ntnu.no.
Nature
|March 22, 2019
概括
电磁成像显示地幔被动上升和融化在超慢扩散的山脊. 这表明地的厚度是由化产生的岩石体积控制的,而不是以前的模型.
科学领域:
- 地质学
- 海洋学
- 构造学
背景情况:
- 超缓慢扩散的山脊 (<20 mm/年) 缺乏深度成像数据,阻碍了对地幔上升,融化,石化层-石化层边界 (LAB),地厚度和水热通风的理解.
- 之前的电磁研究集中在快速扩散的山脊上,
- 现有的地厚度与扩散速度相关的模型不能完全解释在超慢的山脊上观察到的薄地.
研究的目的:
- 通过先进的电磁方法研究极速缓慢扩散的深层地质过程.
- 了解地幔上升,融化分布,以及莫恩斯山脊的电气 LAB (eLAB).
- 改进解释地厚度和超慢扩散环境中的水热系统动态的模型.
主要方法:
- 详细的120公里深的电磁关节反转模型.
- 控制源电磁 (CSEM) 和磁 (MT) 数据的整合.
- 电阻轮的分析以确定电气LAB (eLAB).
主要成果:
- 地幔上游是沿着一个狭窄,斜和不对称的区域集中,可能是由被动板块运动驱动的.
- 上升天气和融化延伸到莫罗维奇断层,被eLAB (100欧姆米) 包围.
- 薄薄的地最好通过产生融化的岩石体积来解释,活跃的融化位形成了像洛基城堡这样的水热系统.
结论:
- 该eLAB可以代表由最低含量定义的气态边界.
- 在超慢扩散的山脊上,地的厚度直接受融化产生的岩石体积的控制.
- 广泛的地中流体对流系统可能会在超慢扩散的山脊上促进长期的热水通风.
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