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05/12/17 Alexis Licht (University of Washington, Seattle)

Titre: What drove the Paleogene nuts? Addressing some of the biggest tectonic, climatic, and biogeographic enigmas of the last Greenhouse period. (à la Doua)
Quand ? Le 05/12/2017,
de 10:30 à 11:45
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What drove the Paleogene nuts? Addressing some of the biggest tectonic, climatic, and biogeographic enigmas of the last Greenhouse period.

 

The rise of modern mammals, the fall into the Icehouse, the closure of the Tethys Ocean and the uplift Alpine-Himalayan orogen: all these interrelated milestones occurred during the Paleogene, 66 to 34 million years ago, and paved the way to modern Earth Systems. Yet, the biogeographic, tectonic, and paleoclimatic evolution of the Paleogene remains blurry, and we still know little about the chronology and mechanisms of these founding events.

This talk will partly address all these topics, by focusing on three major enigmas that are still puzzling geologists:

-How did continental climates responded to the erratic fall into the Icehouse across the late Paleogene?

-How did some mammals (including primates) disperse from Asia to Africa and South America in the Eocene, across two seaways larger than 800 km?

-When was the Tibetan Plateau uplifted, and what happened to the missing 2000 km of Indian continental crust that “disappeared” since the collision?

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