北斯堪的纳维亚山脉由低级生态地基底支
Metin Kahraman1, Hans Thybo2,3,4, Irina M Artemieva5,6,7
1Eurasia Institute of Earth Sciences, Istanbul Technical University, Maslak, İstanbul, Türkiye.
Nature communications
|January 11, 2025
概括
远离板块边界的高山脉可以通过地幔密度变化来解释. 地震数据显示,Scandes山脉下方高密度生态石的急剧增加,支持了这个新模型.
科学领域:
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
- 地质地质地质地质地质地
背景情况:
- 板块构造学通常解释了板块边界的山脉形成.
- 高地形通常在被动边缘观察到,远离活跃板边界.
- 斯堪迪斯山脉的地形传统上归因于地的变化.
研究的目的:
- 为了调查沿着被动边缘的高地形的原因.
- 为了测试冰静性支的假设,通过地密度和厚度的变化来测试Scandes.
- 为了提供一个替代解释斯坎德斯"神秘的地形.
主要方法:
- 获取和分析Silverroad地震资料数据.
- 重力异常和地形的建模.
- 集成地震数据与重力和地形模型.
主要成果:
- 斯坎德斯山下方的地在地震学上厚度均 (约44公里),而在莫霍山上方是均的.
- 在Scandes和Proterozoic盾下观察到Pn速度从7.6公里/秒到>8.2公里/秒的显著突然变化.
- 重力和地形建模表明,从斯坎德斯到盾牌的变态生态石级度从35%增加到70%.
结论:
- 斯坎德斯山的高地形不由地根支.
- 在一个均的Moho之下,生态密度的鲜明对比解释了地形.
- 这项研究挑战了在被动边缘建造山脉的传统模型.
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