相关实验视频

Updated: Jul 19, 2025

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Published on: October 25, 2019

澳大利亚地质岩石的形成来自重力和磁性指示器

Kurosh Karimi¹, Gunther Kletetschka^2,3, Jiří Mizera^4,5

¹Institute of Hydrogeology, Engineering Geology and Applied Geophysics, Faculty of Science, Charles University in Prague, Albertov 6, 128 43, Praha 2, Czech Republic. karimik@natur.cuni.cz.

Scientific reports

|August 8, 2023

概括

卫星数据显示,中国的Badain Jaran沙漠有一个潜在的撞击结构,这表明它是澳大利亚 tektites 的来源. 引力和磁性异常支持这种撞击坑假设.

科学领域:

地质物理学地质物理学
行星科学行星科学
遥感遥感遥感遥感

背景情况:

澳大利亚特克石的撞击坑仍然未被发现,普遍共识指向印度支那.
最近的一项假设表明,中国西北部的巴达因贾兰沙漠 (Badain Jaran Desert,简称BJD) 是另一个撞击地点.

研究的目的:

通过使用卫星衍生地质物理数据,调查巴达因贾兰沙漠中可能存在撞击结构的可能性.
评估BJD的适用性,作为澳大利亚 tektites 的来源位置.

主要方法:

分析卫星推导的重力数据,包括自由空气重力干扰,垂直导数,总水平梯度 (THG),冲击对齐 (SA) 和Bouguer异常.
分析卫星导出的磁数据,包括异常总磁场 (TMF),减少到极 (RTP) 变换,第一个垂直导数 (Bzz),倾斜角 (TA) 和物流总水平梯度 (LTHG).

主要成果:

重力数据表明环状重力高点围绕着中心重力低点,这是撞击结构的特征.
磁力数据显示出显著的异常,RTP分析将它们定位在拟议的石坑边缘内.
SA,Bzz,TA和LTHG分析进一步描述了与撞击起源相一致的结构特征和磁化模式.

结论:

来自重力和磁性数据的地球物理证据强烈支持巴达因贾兰沙漠存在撞击结构的存在.
这些发现表明,BJD是澳大利亚特克石母撞击坑的可行候选者,挑战了以前的位置假设.

更多相关视频

Magnetic Tweezers for the Measurement of Twist and Torque

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 15, 2013

相关概念视频

Magnetostatic Boundary Conditions

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

Other Unique Bacteria

Other Unique Bacteria

Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...

Gravimetry: Inorganic And Organic Precipitating Agents

Gravimetry: Inorganic And Organic Precipitating Agents

In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...

Magnetism

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...

Magnetic Declination

Magnetic Declination

Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...

Magnetic Susceptibility and Permeability

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...