通过被动边缘沉积物沉降加快印度 - 欧亚融合
Hao Zhou1, Jiashun Hu2,3, Luca Dal Zilio4,5
1Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China.
Nature
|November 7, 2024
概括
由于印度被动边缘的沉积物,印度-欧亚快速融合加速了大约6500万年前. 这个地质事件限制了最初的碰撞到大约6000万年前.
科学领域:
- 地质学
- 地质学
- 地质化学
背景情况:
- 印度和欧亚板块在6500万年前的加速融合是一个复杂的地质事件.
- 之前的解释对构造历史和影响板块速度的力量不确定.
研究的目的:
- 解释印度-欧亚融合率在650万年前的迅速增长.
- 调查沉积物沉降在加速中的作用.
主要方法:
- 甘地岩石的地化学分析 (同位素和微量元素).
- 用地力学建模来模拟沉积物沉降效应.
- 对地幔来源的沉积物融化贡献的分析
主要成果:
- 大约在65万年前,土生土长的沉积物融化对岩的地幔来源有所增强.
- 数字实验表明,厚沉积物 (1公里以上) 的沉积可以促进地的融合和延伸.
- 收的加速与被动边缘衍生的沉积物的到来有关.
结论:
- 印度-欧亚汇聚的快速加速是由印度北部被动边缘沉积物的沉降解释的.
- 印度与欧亚的初始碰撞时间约为60万年前.
- 在大陆组装的最后阶段,潜水速度的暂时加速可能是常见的.
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