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幔子细分沿着阿曼ophiolite化石中洋山脊沿着幔子细分
Laurent Le Mée1, Jacques Girardeau, Christophe Monnier
1UMR-CNRS 6112, Laboratoire de Planétologie et Géodynamique, Université de Nantes, 2 rue de la Houssinière, BP 92208, 44322 Nantes cedex 3, France. Laurent.Lemee@chimie.univ-nantes.fr
Nature
|November 13, 2004
概括
研究人员研究了阿曼岩石,以了解中洋山脊下地幔过程. 化学变异揭示了地幔上游的3D几何形状,将化石山脊细分与现代过程联系起来.
科学领域:
- 地质地质地质地质地质地
- 地质化学 地质化学
- 石化学 石化学是一门学科.
背景情况:
- 由于有限的直接地幔采样,将中洋脊细分与地幔过程联系起来具有挑战性.
- 表面的岩化学物质被融提取显著改变,使地幔过程分析复杂化.
- 奥菲奥利特,海洋石质层的化石,为下峰地幔条件提供了关键的见解.
研究的目的:
- 为了研究一个化石中洋山脊下地幔上游的三维几何.
- 为了将观察到的地幔变化与现代中洋山脊的细分模式联系起来.
- 分析来自阿曼岩的地幔样本的相化学和元素组成.
主要方法:
- 在阿曼岩沿线收集和分析了174个地幔样本.
- 详细分析相化学,主要元素和微量元素.
- 对海洋石质层化石进行地质化学分析,以推断地幔过程.
主要成果:
- 对融化过程敏感的元素比率沿着化石山脊进行了分析.
- 这些比率的变化揭示了地幔上游的独特的三维几何.
- 观察到的几何学与现代中洋山脊中看到的细分模式相关.
结论:
- 这项研究成功地将地幔上升的几何结构与使用奥菲奥利特数据的中洋脊细分联系起来.
- 奥菲奥利特作为一种有价值的自然实验室,用于了解山脊下地幔动态.
- 这项研究为解释海洋环境中地幔过程提供了一个新的框架.
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