在地幔过渡区深度的冷潜板中的磁性
I Kupenko1, G Aprilis2,3, D M Vasiukov2,3,4
1Institut für Mineralogie, University of Münster, Münster, Germany. kupenko@uni-muenster.de.
Nature
|June 7, 2019
概括
地球地幔中的富含铁的血 (α-Fe2O3) 在深度过渡区的深度仍然具有磁性,这可能解释了逆转期间的深度磁异常和虚拟地磁极路径.
科学领域:
- 地质学
- 矿物物理
- 地球科学
背景情况:
- 地球地与地幔的界限 (Mohorovičić不连续性) 被认为是将磁性地与非磁性地分开的.
- 地质数据和地幔外石表明地幔内存在磁源.
- 铁氧化物,特别是血 (α-Fe2O3),由于其高临界温度,是深磁异常的主要候选物.
研究的目的:
- 在高压和高温下研究铁氧化物的磁性特性,特别是对地球地幔的相关性.
- 在地幔条件下确定Fe2O3多态的磁转换和临界温度.
- 评估深层地幔磁源对观察到的地磁现象的贡献.
主要方法:
- 使用同步波摩斯源光谱.
- 采用激光加热的钻石细胞来复制地幔压力-温度条件 (高达90 GPa和1,300 K).
- 分析了Fe2O3的多态,专注于血的磁性行为.
主要成果:
- 黑马 (α-Fe2O3) 在与地球过渡区相对应的深度表现出磁性特性,特别是在冷降温地热中.
- 在西太平洋地区发现了深层磁化岩层.
- 观测到这些深磁源与地球虚拟地磁极在逆转过程中的偏好路径之间的空间相关性.
结论:
- 在地幔过渡区内可以产生深层磁源.
- 这些深磁源可能会影响地磁数据和虚拟地磁极路径的解释.
- 这些发现需要对地球深层磁场模型进行重新评估,以及对其他缺乏活跃动态的行星体进行研究.
相关概念视频
Transition Zone
362
The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
362
Hybrid Zones
21.8K
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
21.8K
Properties of Transition Metals
29.7K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.7K
Phase Transitions
22.8K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
22.8K
Cooperative Allosteric Transitions
8.7K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.7K
Zones of Protection
779
In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
779


