裂引起的岩石裂导致了金伯利特火山活动
Thomas M Gernon1, Stephen M Jones2, Sascha Brune3,4
1School of Ocean and Earth Science, University of Southampton, Southampton, UK. T.M.Gernon@soton.ac.uk.
Nature
|July 26, 2023
概括
金伯石的喷发与大陆的分裂和裂变过程有关. 在裂变事件发生数百万年后,石层与石层的边界使地幔不稳定,导致化和岩形成.
科学领域:
- 地质化学和石化学
- 构造学和地力学
背景情况:
- 金伯石是来自地球地幔深处的富含挥发物质的岩石.
- 它们的喷发模式与超大陆周期有关, 但驱动机制仍有争议.
- 之前的假设涉及地幔羽毛或岩层减弱.
研究的目的:
- 调查金伯岩岩层与大陆分裂之间的关系.
- 为了阐明负责石动员和喷发的地力学过程.
主要方法:
- 与大陆分裂事件相对的金伯利特喷发年龄的分析.
- 开发和应用石化层与石化层相互作用的动态和分析模型.
- 模拟压缩部分融过程.
主要成果:
- 大多数金伯石是在大陆分裂后大约3000万年爆发的.
- 裂变造成了的石化层-石化层边界,导致了长期的石化层不稳定.
- 这种不稳定会破坏石层的基础,引发化和石的形成.
结论:
- 金伯利特的偶发性与裂变和超大陆周期有机联系.
- 这一过程涉及到岩层的破坏稳定,并用岩层材料取代.
- 这为金伯岩岩的起源和时间提供了定量解释.
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