Video Experimental Relacionado
Updated: Jul 11, 2026

06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
Helio-3 del manto: ¿señal primordial o polvo cósmico?
Resumen
Las partículas de polvo interplanetario (IDP) entregan helio-3 a la Tierra, lo que podría explicar las altas proporciones de helio-3/helio-4 en los magmas de puntos calientes. Esto sugiere que los sedimentos antiguos, no el material primordial del manto, pueden ser la fuente.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- Las altas proporciones de helio-3/helio-4 en los magmas de puntos calientes se atribuyen tradicionalmente a un reservorio primordial, no gaseado y profundo del manto terrestre.
- Las partículas de polvo interplanetario (IDP) son una fuente importante de helio-3 entregado a la superficie de la Tierra.
Objetivo del estudio:
- Investigar el papel de las partículas de polvo interplanetario (IDP) y los sedimentos reciclados en la explicación de las proporciones de helio-3/helio-4 observadas en los magmas de puntos calientes.
- Desafiar la teoría prevaleciente de una fuente primordial del manto profundo para altas proporciones de helio-3/helio-4.
Principales métodos:
- Análisis de las proporciones de helio-3 y helio-4 en magmas de puntos calientes.
- Consideración de la entrega de helio-3 a través de partículas de polvo interplanetario (IDP).
- Modelado del reciclaje de antiguos sedimentos de aguas profundas en el manto de la Tierra.
Principales resultados:
- El reciclaje de sedimentos de aguas profundas que contienen IDP puede explicar las altas proporciones de helio-3/helio-4 en los magmas de puntos calientes.
- Los basaltos con altas proporciones de helio-3/helio-4 pueden originarse de la desgasificación de antiguos sedimentos pelágicos (1.5-2.0 mil millones de años).
- El influjo de PDI también explica las composiciones de neón y siderófilos observadas en muestras del manto.
Conclusiones:
- La presencia de altas proporciones de helio-3/helio-4 en los magmas de puntos calientes se explica probablemente por la incorporación y desgasificación de antiguos sedimentos enriquecidos con helio de los IDP.
- Esto proporciona una explicación alternativa a la teoría primordial del depósito del manto profundo.
- El influjo de partículas de polvo interplanetario juega un papel crucial en la geoquímica del manto.
Videos de Conceptos Relacionados
Noble Gases
The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
Nuclear Fusion
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Nuclear Binding Energy
The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound together;...
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Emission Spectra
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.

