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Restricciones en el movimiento de fusión debajo de la subida del Pacífico Este de 230Th-238U desequilibrio
Haibo Zou1, Alan Zindler, Yaoling Niu
1Department of Earth and Space Sciences, University of California at Los Angeles, Los Angeles, CA 90095, USA. hzou@ess.ucla.edu
Science (New York, N.Y.)
|January 5, 2002
Resumen
Los basaltos de la cresta del océano medio entraron en erupción simétricamente en la elevación del Pacífico Este, lo que sugiere un transporte de fusión subterránea a gran escala. Este estudio proporciona información sobre el origen de los basaltos enriquecidos que se encuentran lejos del eje de la cresta.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Petrología Petrología.
- Geología marina Geología marina.
Sus antecedentes:
- Los basaltos de la cresta oceánica media (MORB) proporcionan información crucial sobre los procesos del manto de la Tierra.
- Comprender el vulcanismo fuera del eje es clave para descifrar el transporte y la diferenciación del magma.
- Estudios anteriores se han centrado principalmente en los procesos en el eje.
Objetivo del estudio:
- Para investigar el origen y el transporte de fundidos basálticos lejos de la elevación del Pacífico Este.
- Para analizar el desequilibrio 230Th-238U en basaltos fuera del eje.
- Para restringir la petrogénesis de basaltos enriquecidos con elementos incompatibles de las crestas oceánicas (EMORB).
Principales métodos:
- Análisis del desequilibrio de 230Th-238U en muestras de basalto.
- Caracterización geoquímica de los basaltos normales de las crestas medio-oceánicas (NMORBs) y EMORBs.
- Cartografía geológica y muestreo de rocas volcánicas a diferentes distancias del eje de la cresta.
Principales resultados:
- Se observó una erupción casi simétrica de NMORB y EMORB hasta 20 km fuera del eje.
- Hay evidencia de transporte lateral subterráneo a gran escala del derretimiento NMORB a tasas de 19-21 cm/año.
- Se identificaron firmas geoquímicas distintas para los EMORB fuera del eje.
Conclusiones:
- El transporte de fusión subterránea juega un papel importante en el vulcanismo fuera del eje.
- Los EMORBs encontrados fuera del eje tienen una historia petrogenética única.
- Los hallazgos desafían los modelos tradicionales del magmatismo de la cresta oceánica media.
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