Video Experimental Relacionado
Updated: May 3, 2026
11:50
Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
Published on: June 13, 2015
12.0K
El bajo flujo de calor inferido de los zircones >4 Gyr sugiere interacciones en los límites de las placas Hadeanas
Michelle Hopkins1, T Mark Harrison, Craig E Manning
1Institute of Geophysics and Planetary Physics and Department of Earth and Space Sciences, University of California, Los Angeles, California 90095, USA.
Nature
|November 28, 2008
Resumen
Los antiguos zircones revelan las condiciones de la Tierra temprana. El análisis de los circones de Hadean sugiere que los magmas se formaron en zonas de subducción, lo que indica un menor flujo de calor de lo que se pensaba anteriormente.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Ciencias planetarias Ciencias planetarias.
- La mineralogía es la Mineralogía.
Sus antecedentes:
- El eón Hadeano (primeros ~600 millones de años de la historia de la Tierra) se entiende mal debido a la falta de registros rocosos.
- Los zircones de detrital de Jack Hills, Australia Occidental, ofrecen una visión potencial de las condiciones de la Tierra temprana.
- Estudios previos sugieren que la hidrosfera y la corteza continental existían antes de hace 4 mil millones de años.
Objetivo del estudio:
- Para investigar las condiciones de formación magmática de los zircones del Hadeano.
- Para utilizar las inclusiones minerales dentro de los circones para el análisis termobarométrico.
- Para inferir el flujo de calor temprano de la Tierra y los entornos tectónicos.
Principales métodos:
- Examen de más de 400 circones de Hadean de las colinas de Jack.
- Análisis termobarométrico de las inclusiones minerales dentro de los zircones.
- Investigación geoquímica de las propiedades del circón.
Principales resultados:
- Los análisis termobarométricos limitaron las condiciones de formación magmática a ~700°C y 7 kbar para los zircones de 4.02-4.19-Gyr.
- Esto implica un flujo de calor cercano a la superficie de ~75 mW m-2, significativamente menor que el flujo de calor global estimado del Hadeano.
- El bajo flujo de calor es comparable al magmatismo moderno de la zona de subducción.
Conclusiones:
- Es probable que los magmas del Hadeano se hayan formado en un entorno de empuje inferior, similar a los márgenes convergentes modernos.
- Esto sugiere que la Tierra primitiva pudo haber tenido procesos tectónicos que se asemejan a las modernas zonas de subducción.
- Los hallazgos proporcionan nuevas restricciones sobre la evolución térmica y tectónica de la Tierra primitiva.
Más Videos Relacionados
06:55Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
7.3K
12:18Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys
Published on: June 27, 2022
4.2K
Videos de Conceptos Relacionados
01:19Mechanism of heat transfer
2.3K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
2.3K
01:12Heat Flow and Specific Heat
5.7K
Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
5.7K
01:20Mechanisms of Heat Transfer II
4.5K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.5K
01:21Isothermal Processes
3.8K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
3.8K
01:14Mechanisms of Heat Transfer
1.9K
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
1.9K
01:29Diversity of Archaea IV
639
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
639