Video Experimental Relacionado
Updated: Jul 12, 2026
06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
Los elementos generadores de calor y los patrones térmicos y báricos de los cinturones metamórficos
Science (New York, N.Y.)
|November 9, 1990
Resumen
Las cuencas sedimentarias ricas en uranio (U) y torio (Th) pueden generar un calor significativo durante el metamorfismo. Este calor explica la amplia difusión de rocas metamórficas de alto grado y granitos que se encuentran en el terreno de Maine Central de Nueva Inglaterra.
Área de la Ciencia:
- Geología Geología Geología.
- Petrología Metamórfica.
- La geoquímica es la geoquímica.
Sus antecedentes:
- Las características de las cuencas sedimentarias influyen en los patrones térmicos y de presión de las cintas metamórficas.
- Las cuencas anóxicas pueden acumular altas concentraciones de elementos productores de calor como el uranio (U) y el torio (Th).
Objetivo del estudio:
- Investigar la influencia de la composición de las cuencas sedimentarias en el desarrollo del cinturón metamórfico.
- Para explicar la asociación espacial de granitos y rocas metasedimentarias de alto grado en el terreno del centro de Maine.
Principales métodos:
- Análisis de las concentraciones de elementos generadores de calor (U y Th) en rocas metasedimentarias.
- Modelado térmico del engrosamiento y reequilibrio de la corteza.
- Comparación de las predicciones del modelo con los patrones de temperatura y presión observados en los Apalaches Acadianos.
Principales resultados:
- Las altas concentraciones de U y Th en los sedimentos de la cuenca anóxica del Silurio están relacionadas con su fijación en condiciones reducidas.
- El engrosamiento de la corteza durante la orogenia acadiana devoniana condujo a la liberación de energía térmica de estos sedimentos enriquecidos.
- Este proceso generó la amplia zona observada de rocas metamórficas de alto grado y granitos anatecticos.
Conclusiones:
- La composición de las cuencas sedimentarias pre-deformacionales es un factor crítico en la evolución térmica de los cinturones metamórficos.
- La hipótesis de la generación de calor a partir de sedimentos ricos en U y Th explica con éxito los patrones térmicos y de presión de los Apalaches acadianos.
Más Videos Relacionados
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
12:30High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
Published on: April 3, 2018
Videos de Conceptos Relacionados
01:20Mechanisms of Heat Transfer II
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...
01:27Gradient Fields
A gradient field is a vector field derived from a scalar field. A scalar field assigns a single numerical value to every point in space, such as temperature, pressure, or electric potential. The gradient field describes how that value changes from point to point. It gives both the direction of the fastest increase and the rate of change in that direction.For a scalar field f(x, y), the gradient is written as\begin{equation*}\nabla f=\left\langle \jfrac{\partial f}{\partial x},\jfrac{\partial...
01:16Thermal Sigmatropic Reactions: Overview
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
01:19Thermal Strain
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
01:14Mechanisms of Heat Transfer I
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
01:09Thermal Stress
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...