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Updated: Jan 10, 2026
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在背弧地积上进行地幔形控制
Fernando Martinez1, Brian Taylor
1Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA. martinez@soest.hawaii.edu
Nature
|March 29, 2002
概括
背弧盆地由于潜伏诱导的地幔流动而显示出多样化的岩供应. 这一过程重新引入了被耗尽的地幔,影响了融的提取和地的积累,与中洋山脊不同.
科学领域:
- 地质地质地质地质地质地
- 地质物理学 地质物理学
- 构造学 构造学 构造学 构造学
背景情况:
- 中洋山脊涉及地幔向导和部分融化,而枯竭的地幔流失.
- 后弧盆地受到影响,起板块影响地幔向导,融提取和梯度.
- 预计地幔形动力学将对后方弧形扩散过程产生重大影响.
研究的目的:
- 为了研究后弧盆地传播中心的岩供应变化.
- 为了将岩供应与火山前线的距离和扩散速度相关联.
- 提出一种模型,解释后弧盆地观察到的岩供应模式.
主要方法:
- 在Lau后方弧盆地中传播中心岩供应的分析.
- 岩供应与距离火箭火山前线的关系.
- 岩供应与传播速度的相关性.
- 开发一个模型,涉及潜水诱导的角流和地幔翻转.
主要成果:
- 在扩散中心的岩供应有所变化,与火山前线的距离相关,但与扩散速度无关.
- 增强的岩供应发生在火山前线附近.
- 从角落更远的翻转的枯竭地幔内观察到化的减少.
- 正常的化条件存在于更远的未消耗地幔中.
结论:
- 沉降诱导的角流翻了枯竭的上层地幔,将其重新引入后方弧盆下.
- 该模型解释了不同扩散中心的增强,减少和正常融条件.
- 拟议的机制解释了背弧和中洋环境之间地积的根本差异.
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