Video Experimental Relacionado
Updated: Jul 12, 2026
10:28
Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
Una fuente importante de Helio-3 a 15oS en el Pacífico Este se eleva
Science (New York, N.Y.)
|October 2, 1981
Resumen
Los científicos descubrieron una enorme pluma de helio-3 en las profundidades del Océano Pacífico, lo que indica una importante inyección de helio en el manto de los sistemas hidrotermales en el East Pacific Rise. Este hallazgo sugiere que existen campos hidrotermales no descubiertos en esta región.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Oceanografía La oceanografía es la oceanografía.
- Geología marina Geología marina.
Sus antecedentes:
- Los sistemas hidrotermales son cruciales para la química de los océanos.
- Los isótopos de helio (helio-3/helio-4) son trazadores de los procesos del manto.
- Estudios anteriores han identificado la actividad hidrotermal en la elevación del Pacífico Este.
Objetivo del estudio:
- Para investigar una extensa pluma de agua enriquecida con helio-3.
- Para determinar el origen y la distribución de la anomalía del helio-3.
- Para comprender los patrones de circulación de aguas profundas e identificar potenciales campos hidrotermales.
Principales métodos:
- Muestreo de agua a varias profundidades en las profundidades del Océano Pacífico.
- Análisis de las relaciones helio-3/helio-4 en muestras de agua.
- Mapeo de la extensión espacial del penacho de helio-3 y las características asociadas.
Principales resultados:
- Un extenso penacho enriquecido con helio-3 fue descubierto a 15 grados S en el East Pacific Rise.
- Las proporciones de helio-3/helio-4 en el núcleo del penacho eran un 50% más altas que el helio atmosférico.
- El penacho se extendió 2000 km al oeste de la subida, asociado con una discontinuidad de densidad llamada "frente de cresta-cresta".
Conclusiones:
- La pluma de helio-3 se origina en el manto o el helio primordial inyectado a través de sistemas hidrotermales en el centro de propagación.
- La distribución asimétrica del penacho indica una circulación profunda de este a oeste a través de la subida.
- La intensidad y extensión de la anomalía sugieren que los mayores campos hidrotermales oceánicos aún no se han descubierto cerca de 15 grados S en la elevación del Pacífico Oriental.
Más Videos Relacionados
Videos de Conceptos Relacionados
03:40Hess's Law
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
02:54Noble 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.
01:20Sulfur Assimilation
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...
03:12Freezing Point Depression and Boiling Point Elevation
Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
01:24Freezing Point Depression and Boiling Point Elevation
When a non-volatile solute is added to a pure solvent, it results in the lowering of the freezing point of the solvent. This phenomenon is called freezing point depression. The extent to which the freezing point is lowered depends on the molality of the solute -the number of moles of solute per kilogram of solvent and the cryoscopic constant of the solvent.From the plot of chemical potential, μ, against temperature, it is evident that the μ of both solid and liquid solvents decrease with...
01:19Magnetic 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...