Video Experimental Relacionado
Updated: Jun 3, 2026
06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
El congelamiento y la fusión de redox en el manto profundo de la Tierra como resultado del acoplamiento redox
1Institut für Geochemie und Petrologie, ETH Zürich, Sonneggstrasse 5, 8092 Zürich, Switzerland. arno.rohrbach@gmail.com
Nature
|March 29, 2011
Resumen
Fusión inducida por carbonatos en las profundidades de la Tierra.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Física de los minerales Física de los minerales
- Sismología Sismología Sismología.
Sus antecedentes:
- La litosfera oceánica subducida puede transportar carbonatos al manto profundo.
- La presencia de carbonato está relacionada con las anomalías de la velocidad sísmica y el derretimiento del manto.
- El inicio del derretimiento en el manto superior a menudo se desencadena por pequeñas cantidades de carbonato.
Objetivo del estudio:
- Para investigar el derretimiento inducido por carbonato en la zona de transición profunda de la Tierra y el manto inferior.
- Para entender el destino de la carbonatita que se derrite durante el reciclaje del manto.
- Para explicar la formación de fundimientos del manto profundamente asentados.
Principales métodos:
- Petrología experimental para simular las condiciones profundas de la Tierra.
- Análisis de la estabilidad y transformación del fundido.
- Investigación de las condiciones redox y la especiación del hierro en los minerales del manto.
Principales resultados:
- Los fundidos de carbonatita son inestables en el manto ambiental y se transforman en diamante a menos de ~ 250 km de profundidad.
- Un proceso de "congelación redox" inmoviliza el carbono como diamante, preservando el Fe3+.
- El diamante reacciona con el conservado Fe (((3+) durante el upwelling, causando la fusión redox a ~660 y ~250 km.
Conclusiones:
- El derretimiento inducido por los carbonatos puede ocurrir en la litosfera profundamente subducida.
- La congelación redox y el posterior derretimiento explican la generación de fusión profundamente asentada.
- Este proceso contribuye a la heterogeneidad del manto y al ciclo profundo del carbono.
Más Videos Relacionados
09:45Laboratory Simulation of an Iron(II)-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria
Published on: July 24, 2016
11:50Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
Published on: June 13, 2015
Videos de Conceptos Relacionados
01:24Microbes and Other Elemental Cycles
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
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...
01:23Redox Equilibria: Overview
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
01:24Redox Reactions
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
01:27Redox Reactions
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
03:11Oxidation-Reduction Reactions
Oxidation–Reduction Reactions