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Updated: Jul 12, 2026

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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
Published on: August 7, 2017
Impulsos ígneos alcalinos tempranos y tardíos y una pluma alta de 3He Origen de los basaltos de inundación del Decán
Resumen
Complejos ígneos alcalinos en la India.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Geoquímica de Isótopos La geoquímica de los isótopos es la química de los isótopos.
- Petrología Ígnea.
Sus antecedentes:
- La provincia de basalto de inundación continental (CFB) de Deccan en la India exhibe un alto flujo de calor y anomalías de gravedad.
- Los complejos ígneos alcalinos de afinidades nefelinita-carbonatita se encuentran en zonas extensivas dentro de la provincia de Deccan CFB.
Objetivo del estudio:
- Investigar el momento y la naturaleza del magmatismo relacionado con la provincia de Deccan CFB.
- Para entender la dinámica de la pluma del manto que precedió a la erupción de Deccan CFB.
Principales métodos:
- La datación argón-argon (40Ar/39Ar) de muestras de biotita de complejos alcalinos.
- Análisis geoquímico, incluyendo las relaciones de isótopos de helio (3He/4He) y estroncio (87Sr/86Sr).
Principales resultados:
- La datación con biotita reveló dos pulsos magmáticos distintos: uno en ~68.6 Ma y uno posterior en ~65.0 Ma.
- Los complejos más antiguos exhiben altas proporciones de 3He/4He (14,0 veces el aire) y firmas isotópicas de Sr similares a los basaltos de las islas oceánicas.
- El pulso posterior muestra evidencia de contaminación de la corteza.
Conclusiones:
- El volcanismo de Deccan CFB fue precedido por ~ 3,5 millones de años de incubación de pluma de manto.
- Las características de pluma del manto primitivo se conservan en las primeras fases magmáticas.
- La interacción de la corteza terrestre influyó en la actividad magmática posterior dentro de la provincia de Deccan.
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