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冷却速度和融提取时间尺度通过在浅层地岩石上的扩散计时学来确定
Thomas Grocolas1, Othmar Müntener1, Elias M Bloch1,2
1Institute of Earth Sciences, University of Lausanne, Géopolis, CH-1015 Lausanne, Switzerland.
Contributions to mineralogy and petrology. Beitrage zur Mineralogie und Petrologie
|July 14, 2025
概括
扩散计时学揭示了浮动岩石中的磁性时间尺度,显示了与火山系统相似的晶体居住时间. 这项研究通过分析阿达梅洛石中的冷却速度和晶体融化分离来弥合浮动和火山运动之间的差距.
科学领域:
- 地质化学和石矿学
- 同位素地质年代学 同位素地质年代学
- 磁性系统 磁性系统
背景情况:
- 扩散计时法是火山岩中岩石过程的关键工具.
- 由于冷却速度缓慢,将扩散计时法应用于浮动岩石具有挑战性.
- 了解冥王星系统中的时间尺度对于将它们与火山活动联系起来至关重要.
研究的目的:
- 为了研究阿达梅洛石中的冷却速度和水晶融分离时间表.
- 评估扩散计时法对子系统的适用性.
- 为了比较浮岩和火山环境中的岩石时间尺度.
主要方法:
- 从阿达梅洛巴索利石 (Adamello batholith) 获得的石英晶体和石质晶体中扩散配置的分析.
- 确定结晶温度和初始扩散条件.
- 采用石英和石英扩散配置文件来建模冷却速率.
- 基于扩散建模和冷却速度的晶体融化分离时间表的计算.
主要成果:
- 阿达梅洛巴索利石的估计冷却速度与热建模和先前的地球时间学数据一致.
- 计算的晶体融化分离时间范围从10^4到10^5年.
- 这些时间表代表了在边缘结晶之前的质质核到地幔的居住时间.
- 石晶体的居住时间与火山喷发和石结晶中发现的时间相似.
结论:
- 子系统可以有效地使用扩散计时法来重建磁性时间尺度.
- 这项研究支持了浮石和火山过程之间的强烈联系.
- 扩散计时法为岩系统的长期演变提供了宝贵的见解.
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