Video Experimental Relacionado
Updated: Jul 30, 2026
07:32
Dynamic Electrochemical Measurement of Chloride Ions
Published on: February 5, 2016
Conductividad eléctrica en la litosfera precámbrica del oeste de Canadá
1D. E. Boerner and J. A. Craven, Geological Survey of Canada, 615 Booth Street, Ottawa, Ontario K1A OE9, Canada. R. D. Kurtz and W. J. Davis, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada. G. M. Ross, Geologica.
Science (New York, N.Y.)
|January 29, 1999
Resumen
La provincia meridional de Archean Churchill (ACP) muestra una conductividad eléctrica significativamente mayor en su litosfera subcrustal en comparación con las áreas circundantes. Esta conductividad mejorada se debe probablemente a eventos tectónicos y metasomatismo durante la era Paleoproterozoica.
Área de la Ciencia:
- La geofísica es la geofísica.
- La geoquímica es la geoquímica.
- La tectónica es la tectónica.
Sus antecedentes:
- La litosfera subcrustal debajo de la provincia de Churchill del sur de Archean (ACP) exhibe una conductividad eléctrica anómala.
- Las propiedades eléctricas de la litosfera paleoproterozoica se explican generalmente por la conductividad olivina.
Objetivo del estudio:
- Investigar las razones de la alta conductividad eléctrica en la litosfera subcrustal del sur de los países ACP.
- Para entender los procesos geológicos que modificaron esta región.
Principales métodos:
- Mediciones de las propiedades eléctricas de la litosfera.
- Análisis de los xenolitos del manto.
- Cartografía geológica.
Principales resultados:
- La litosfera subcrustal del sur de los países ACP es más de diez veces más conductiva eléctricamente que la corteza paleoproterozoica adyacente.
- La evidencia sugiere una modificación litosférica significativa debido al atrapamiento entre dos zonas de subducción del Paleoproterozoico.
- El metasomatismo inducido tectónicamente es una causa potencial para la conductividad aumentada.
Conclusiones:
- La alta conductividad eléctrica de la litosfera subcrustal del sur de los ACP se atribuye a la actividad tectónica paleoproterozoica y el posterior metasomatismo.
- Los datos geofísicos y geológicos revelan una compleja historia de la evolución litosférica en esta región.
Videos de Conceptos Relacionados
01:22Resistivity
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
01:13Electrical Conductivity
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
01:29Electrical Transport
The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
01:23Insulation Coordination
Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times for...
01:23Transmission Line Design Considerations
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
01:25Resistance and Conductance
A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their length...
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their length...