Video Experimental Relacionado
Updated: Jul 12, 2026
06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
La flotación del diamante en el manto se derrite a alta presión
Science (New York, N.Y.)
|July 14, 1995
Resumen
Los diamantes flotantes en el manto primitivo se derriten a altas presiones, lo que sugiere que la zona de transición puede ser un importante depósito de diamantes. Este hallazgo impacta nuestra comprensión de la Tierra.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Física mineral Física de los minerales
- Ciencias experimentales de alta presión Ciencias experimentales de alta presión.
Sus antecedentes:
- Comprender el comportamiento de las fases de carbono dentro del interior profundo de la Tierra es crucial para descifrar los procesos del manto.
- Los modelos anteriores de la estabilidad del diamante y el transporte en el manto han sido limitados por datos experimentales directos.
Objetivo del estudio:
- Para determinar experimentalmente la densidad del diamante en relación con el manto primitivo se funde a altas presiones y temperaturas.
- Para investigar las implicaciones de la flotabilidad del diamante para su acumulación en la zona de transición de la Tierra.
Principales métodos:
- Experimentos de células de yunque de diamante de alta presión y alta temperatura.
- Observación del comportamiento del diamante (flotando o hundiéndose) en composiciones sintetizadas de fusión del manto.
- Mediciones precisas de las condiciones de presión y temperatura.
Principales resultados:
- Se observó que el diamante flotaba en fundidos primitivos del manto a aproximadamente 20 gigapascales y 2360 grados C.
- El diamante también flotó en una fusión derivada de la zona de transición a unos 16 gigapascales y 2270 grados C.
- Estos resultados proporcionan restricciones directas a las densidades de magma en condiciones profundas del manto.
Conclusiones:
- La flotabilidad del diamante en fundidos del manto profundo indica que puede acumularse en la zona de transición.
- La zona de transición probablemente ha sido un reservorio a largo plazo de diamantes precipitados o atrapados desde la historia temprana de la Tierra.
- Este mecanismo de acumulación tiene implicaciones significativas para el ciclo profundo del carbono y la evolución del manto.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:05Density and Archimedes' Principle
When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The reason...
02:32Bonding in Metals
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
01:12Buoyancy
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy. The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the fluid?
To get...
To get...
02:39Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
01:18pV-Diagrams
The pV diagram, which is a graph of pressure versus volume of the gas under study, is helpful in describing certain aspects of the substance. When the substance behaves like an ideal gas, the ideal gas equation describes the relationship between its pressure and volume. On a pV diagram, it is common to plot an isotherm, which is a curve showing p as a function of V with the number of molecules and the temperature fixed. Then, for an ideal gas, the product of the pressure of the gas and its...
02:39Phase Diagrams
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...