石质层地幔的破坏和重新生长在大火性地区下面的岩层地幔
Simon N Stephenson1, Patrick W Ball2, Fred D Richards3
1Department of Earth Sciences, University of Oxford, Oxford, UK.
Science advances
|September 6, 2023
概括
大火性省份 (LIPs) 涉及大规模的岩事件,使地球的石化层变薄. 随着时间的推移,这种石质层会重新生长,影响大陆的稳定性和资源.
科学领域:
- 地质科学是地球科学.
- 地质物理学 地质物理学
- 地质化学 地质化学
背景情况:
- 大火山性省份 (LIP) 代表了具有重大全球环境和地力学影响的巨大岩事件.
- 在LIP安置期间和之后,石质层结构的演变并未得到充分理解.
- 石质层结构影响了地幔融过程.
研究的目的:
- 为了研究石质层厚度在大型火山区事件期间和之后的演变.
- 了解岩,石层结构和时间之间的关系.
主要方法:
- 使用地质化学和地震学观测.
- 分析了LIP下面的现代石质层厚度与喷发以来的时间之间的相关性.
主要成果:
- 与LIPs相关的岩发生在薄的石化层 (80公里).
- 石质层厚度和LIP喷发以来的时间之间存在正相关性.
- 大洋石化层重新变厚到~125公里;大陆石化层超过190公里.
结论:
- LIP的安置导致了石质层地幔的系统破坏和再生.
- 这一过程影响了大陆岩层的稳定性,年龄和组成.
- 这些发现对资源分配和环境变化有影响.
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