Video Experimental Relacionado
Updated: Jul 22, 2026
09:13
Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
Published on: April 1, 2017
Una nueva fuente de meteoritos basálticos inferida desde el noroeste de África 011
Akira Yamaguchi1, Robert N Clayton, Toshiko K Mayeda
1Antarctic Meteorite Research Center, National Institute of Polar Research, Tokyo 173-8515, Japan. yamaguch@nipr.ac.jp
Science (New York, N.Y.)
|April 16, 2002
Resumen
Noroeste de África (NWA) 011, un meteorito basáltico, comparte rasgos con los eucritas, pero tiene isótopos únicos de oxígeno. Esto sugiere que múltiples cuerpos padres, no solo el asteroide 4 Vesta, formaron meteoritos basálticos en el sistema solar temprano.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La meteorítica es la meteorología.
- Cosmoquímica es la cosmoquímica.
Sus antecedentes:
- Las eucritas son meteoritos basálticos vinculados al asteroide 4 Vesta.
- Comparten características minerales, isotópicas y químicas comunes.
- El origen de los meteoritos basálticos es crucial para comprender los primeros procesos del sistema solar.
Objetivo del estudio:
- Para analizar el meteorito Noroeste de África (NWA) 011.
- Para comparar las propiedades de NWA 011 con eucritas conocidas.
- Para investigar las implicaciones de la composición única de NWA 011 para los cuerpos madre de los meteoritos.
Principales métodos:
- Análisis mineralógico de NWA 011.
- Análisis isotópico (incluidos los gases nobles y el oxígeno) de NWA 011.
- Comparación de los datos de NWA 011 con los conjuntos de datos existentes de eucrite.
Principales resultados:
- NWA 011 exhibe texturas, mineralogía y firmas de gases nobles similares a las de las eucritas basálticas.
- La composición isotópica de oxígeno de NWA 011 difiere significativamente de otras eucritas.
- Esta distintiva firma de oxígeno sugiere un cuerpo madre separado para NWA 011.
Conclusiones:
- Los hallazgos desafían la hipótesis del cuerpo monoparental para todos los eucritas basálticos.
- Múltiples cuerpos parecidos a asteroides probablemente existieron en el sistema solar temprano, produciendo meteoritos basálticos.
- Las composiciones isotópicas de oxígeno variables indican diversos orígenes para estos primeros materiales del sistema solar.
Videos de Conceptos Relacionados
02:34Water and Mineral Acquisition
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
01:11Atomic Nuclei: Larmor Precession Frequency
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
01:20Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences
Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and refractory oxide ion...
01:26Minerals
Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.
01:30Types of Building Stone
Building stones, essential materials for construction, are extracted from natural rock deposits and processed into specific forms and dimensions suitable for various building applications. These stones are broadly classified into three types based on their geological formation: igneous, sedimentary, and metamorphic.
Igneous rocks are formed from the solidification of magma or lava. An example is granite, known for its durability and resistance to weathering, making it ideal for parts of...
Igneous rocks are formed from the solidification of magma or lava. An example is granite, known for its durability and resistance to weathering, making it ideal for parts of...
01:15Quarrying of Stone
Quarrying is the process of extracting stone from a quarry, where specialized techniques are employed to remove large blocks of stone safely and efficiently. This process can involve controlled explosions or more precision-oriented methods such as cutting and drilling.
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the block.
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the block.