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Exhumación de eclogitas del Plioceno a velocidades tectónicas de placas en el este de Papúa Nueva Guinea

Suzanne L Baldwin¹, Brian D Monteleone, Laura E Webb

¹Syracuse University, Department of Earth Sciences, Syracuse, New York 13244, USA. sbaldwin@syr.edu

|September 17, 2004

Resumen

Este estudio revela la eclogita más joven conocida, formada hace 4,3 millones de años en Papúa Nueva Guinea. La rápida exhumación de estas rocas de alta presión se produjo a velocidades tectónicas de placas debido a la extensión en una zona límite de placas.

Área de la Ciencia:

Geología Geología Geología.
La tectónica es la tectónica.
Petrología Metamórfica.

Sus antecedentes:

Las eclogitas se forman bajo condiciones de alta presión y ultra-alta presión durante la subducción de la placa litosférica.
Los conjuntos y texturas minerales en eclogites registran las condiciones de subducción y exhumación P-T-D.
Las variaciones isotópicas radiactivas dentro de los minerales ayudan a datar los eventos metamórficos.

Objetivo del estudio:

Hasta la fecha el momento de la eclogita se enfrenta a un metamorfismo en el este de Papúa Nueva Guinea.
Investigar las tasas de exhumación y los mecanismos de las eclogitas jóvenes.

Principales métodos:

Datamiento in situ con la microsonda de iones de zircón U/Pb.
Análisis de ensamblajes y texturas minerales.
Cartografía geológica de la zona límite de la placa.

Principales resultados:

El metamorfismo facial de la eclogita data de hace 4,3 +/- 0,4 millones de años.
Esto representa la eclogita documentada más joven expuesta en la superficie de la Tierra.
La exhumación extremadamente rápida (>1 cm yr(-1)) desde una profundidad de ~75 km se produjo a velocidades tectónicas de placas.

Conclusiones:

La exhumación rápida de rocas de alta presión/ultra-alta presión es facilitada por la extensión dentro de las zonas transitorias de límites de placas.
La extensión en el área de la cuenca de Woodlark acomodó una exhumación rápida durante la convergencia de la placa oblicua.
Este estudio proporciona un nuevo ejemplo de eclogitas jóvenes y rápidamente exhumadas vinculadas a procesos activos en los límites de las placas.

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