Geochemistry podcasts

Alexandra Delbot reçoit Laurent Chauvaud et Frédéric Olivier pour explorer les coquilles de bivalves comme archives des milieux marins. La discussion explique comment les stries de croissance et leur composition chimique renseignent sur l’âge, la température, la salinité et les climats passés. Elle aborde aussi les pollutions, les perturbations acoustiques et les réponses biologiques des mollusques, envisagés comme indicateurs des changements de leur habitat.

Hosted by Alexandra Delbot

Robin George Andrews discusses Japan’s planned sampling mission to Phobos and what returned material could reveal about the moon and Mars. Ashton Flinders explains how camera observations, geochemistry and geophysical monitoring revealed patterns in Kīlauea’s lava fountains. Economist Javier Birchenall examines a historical prediction of runaway population growth and the broader difficulty of forecasting major crises.

Hosted by Sarah Crespi

Anat Shahar investigates how rocky planets acquire water, a question central to assessing habitability beyond Earth. Her experiments and models examine chemical reactions between hydrogen-rich atmospheres and early magma oceans. The episode considers why water formation matters alongside a planet’s distance from its star.

Renée Tamblyn examines when and how thick, silica-rich continents emerged from Earth’s early magma-ocean state. The discussion compares gradual growth with episodic formation and explores the role of water released from hydrated minerals in oceanic lithosphere. It also considers hydrogen production by early geological processes and its possible relevance to life.

Stephen Porder explores how living organisms have transformed Earth through their use of hydrogen, oxygen, carbon, nitrogen and phosphorus. Drawing on his book Elemental, the conversation connects these biogeochemical changes across deep time with sustainability and choices that could reduce human environmental impacts.

Hosted by Marty Martin, Cameron Ghalambor