在地球核心顶部的沉积物
B A Buffett1, E J Garnero, R Jeanloz
1Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada. buffet@eos.ubc.ca
概括
地球核心-地幔边界的酸盐沉积层解释了不寻常的地震和地质观测. 这层影响地幔羽毛,增强核心对流,影响地力学.
科学领域:
- 地质物理学 地质物理学
- 地球科学 地球科学 地球科学
- 地震学 地震学
背景情况:
- 最近的地震和地质观测表明,核心-地幔边界存在不寻常的物理性质.
- 地球深层的组成和动态仍然是活跃研究的领域.
研究的目的:
- 为了解释核心-地幔边界观察到的不同寻常的物理性质.
- 提出一个涉及酸盐沉积物的模型,以解释地球物理数据.
主要方法:
- 对地震和地测观测数据的分析.
- 在核心-地幔边界积累和压缩沉积物的物理模型的开发.
主要成果:
- 当地球冷却时,在核心顶部积累的一层酸盐沉积物可以解释观察到的现象.
- 沉积物压缩会排出铁,但会留下可以被地幔对流引进的核心材料.
- 这一过程可以解释热点羽毛中的同位素特征,并增强核心对流力.
结论:
- 拟议的酸盐沉积层为各种地质物理观测提供了统一的解释.
- 这种模型对理解地幔羽毛的组成和地气过程有意义.
- 进一步的研究可以完善对核心-地幔边界过程及其对地球演变的影响的理解.
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