La mayor catástrofe climática del mundo

Investigadores de Australia y EEUU encontraron en las profundidades de rocas, formadas hace 252 millones de años. Son rastros geológicos de antiguas mega erupciones que habrían dado origen al cataclismo.

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Hace 252 millones de años este planeta era otro. La muerte de los extensos bosques de Glossopteris, que producían el carbón de Australia, marcaron un punto en el tiempo.

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Aquella foto del mundo, dejó un dato que asombra: entre el 85 y el 95% de todos los seres vivos que vivieron en esa época se extinguieron. El evento corresponde a un período geológicamente rápido de calentamiento global.

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Las temperaturas de la superficie del mar aumentaron en 15 grados centígrados. Se considera que, a causa de este calentamiento catastrófico, se alteró la composición atmosférica de la Tierra.

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Un equipo de la Universidad de Nueva Inglaterra y la Universidad Estatal de Boise, en EEUU, han identificado un desencadenante adicional del calentamiento global.

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“Hace aproximadamente entre 257 y 252 millones de años, el este de Australia estaba siendo sacudido por una culminación de súper erupciones repetidas, en el período previo al evento siberiano”, explicaron.

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“Nuestro estudio ha confirmado que la fuente de estas capas de ceniza se encuentra en la región de Nueva Inglaterra de Nueva Gales del Sur, donde se conservan los restos erosionados de vastas calderas”, completaron los expertos.

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La erupción de Toba hace 75.000 años en Indonesia casi aniquiló a los primeros humanos durante un prolongado invierno volcánico.

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La correlación de los resultados del estudio con los indicadores del cambio ambiental y la abundancia de especies es consistente con un vínculo entre las grandes erupciones, el estrés del ecosistema y la extinción inicial.

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