对低地幔相稳定性的的影响
Elena-Marie Rogmann1, Eleanor S Jennings1,2,3, Jennifer Ross1
1School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ UK.
Contributions to mineralogy and petrology. Beitrage zur Mineralogie und Petrologie
|April 30, 2024
概括
稳定了下层地幔中的相 (NAL和CF),影响了它们在玄武岩构成中容纳的能力. 这些发现澄清了极端压力下的相位关系.
科学领域:
- 矿物学和石矿学研究.
- 高压地质物理学 高压地质物理学
- 地质化学 地质化学
背景情况:
- 酸铁 (CF) 和新相 (NAL) 是下层地幔中中洋基岩 (MORB) 构成中过量的宿主.
- 简化系统中已知CF和NAL的稳定场,但在下层地幔条件下,额外的组件仍然不清楚.
研究的目的:
- 在较低地幔压力下研究含化合物中相相 (CF和NAL) 的相关系.
- 为了确定石 (KAlSiO4) 对CF和NAL的稳定性和溶性的影响.
主要方法:
- 在nepheline-kalsilite-spinel结合的nepheline顶部周围的一系列组成上进行的实验石器.
- 实验是在高压 (2878 GPa) 和恒温 (2000 K) 下进行的.
主要成果:
- 显著影响相位关系,稳定NAL至至少71GPa,压力远远超过其在无系统中的稳定性.
- CF的稳定场扩大,以增加压力并包含更多的,在68 GPa时显示出显著的溶解性.
- 证实CF和NAL在下层地幔条件下的MORB组合物中是适合的宿主.
结论:
- 在稳定NAL和扩大CF稳定场在下层地幔矿物质组合中起着至关重要的作用.
- 这些发现对理解地球下层地幔中和的地化学循环有意义.
- 预计K-荷兰石在地幔下层压力 (2848 GPa) 的沉积物组成中与CF和NAL一起稳定.
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