PNAS Science Sessions23 Dec 2024

Plumeworld ocean and snowball Earth

How Snowball Earth melted

Science Sessions are brief conversations with cutting-edge researchers, National Academy members, and policymakers as they discuss topics relevant to today's scientific community. Learn the behind-the-scenes story of work published in the Proceedings of the National Academy of Sciences (PNAS), plus a broad range of scientific news about discoveries that affect the world around us.

In this episode, Shuhai Xiao explores how the Earth emerged from a planetwide glaciation called Snowball Earth.

In this episode, we cover:
•[00:00] Introduction
•[00:48] Geobiologist Shuhai Xiao introduces us to Snowball Earth.
•[01:58] Xiao introduces the "plumeworld" hypothesis that describes the end of Snowball Earth.
•[03:41] He explains how lithium isotopes in rocks can confirm the plumeworld hypothesis.
•[05:54] Xiao explains why dolostone deposits in China were suitable for studying this hypothesis.
•[06:53] He talks about the results of the study.
•[07:39] He talks about the implications of the study results.
•[08:26] Caveats and limitations of the study.
•[10:06] Conclusion.

About Our Guests:

Shuhai Xiao
Professor
Virginia Tech

View related content here: https://www.pnas.org/doi/full/10.1073/pnas.2407419121

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