Lunchtime Seminar Schedule

Dr. Soumya Ray, University of Maryland

A combined investigation of iron and silicon isotopic compositions of achondrites: Insights into differentiation processes

August 31, 2022 at 12:00 pm (CHEM 0215)

Abstract: Meteorites provide an opportunity to reconstruct the history of our Solar System. Differentiated meteorites, also called achondrites, are the products of melting and differentiation processes on their parent body. Stable isotopic compositions of bulk differentiated meteorites and their components can add to our understanding of physical parameters such as temperature, pressure, and redox conditions relevant to differentiation on planetesimals and planets in the early Solar System. In this talk, I will discuss my work on using iron and silicon isotopic compositions of a variety of achondrites that record different degrees of differentiation and redox conditions and what they tell us about the differentiation processes that occurred on their parent bodies.

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Dr. Laura Sammon, MathWorks

September 7, 2022 at 12:00 pm (CHEM 0215)

Dr. Julianne Fernandez, University of Maryland

September 28, 2022 at 12:00 pm (CHEM 0215)

Prof. Sarah Mazza, Smith College

Understanding the Mysteries of Bermuda

October 5, 2022 at 12:00 pm (Virtual)

Carl Martin, University of Cambridge

October 19, 2022 at 12:00 pm (Virtual)

Dr. Nico Küter, ETH Zürich

Water speciation in hydrous Stishovite

October 26, 2022 at 12:00 pm (Virtual)

Dr. Quinn Shollenberger, Lawrence Livermore National Lab

November 2, 2022 at 12:00 pm (Virtual)

Dr. Christian Renggli, University of Münster

Sulfur on the Moon and Mercury

November 9, 2022 at 12:00 pm (Virtual)

Abstract: The terrestrial Moon and the innermost planet Mercury share remarkable similarities. The are both very reduced planets and they lack atmospheres. At the reducing conditions the behavior of sulfur differs considerably from that on Earth, Mars, or Venus, and S occurs entirely in its reduced form. In this talk I will provide an overview of what is known about S on the Moon and Mercury, from more than 50 years of lunar sample research and observations from the recent NASA MESSENGER mission to Mercury. I will present results from experimental approaches that allow us to constrain the behavior of S at the surfaces of these two planets, in fumarolic and volcanic processes.

Samantha Jacob, Arizona State University

November 16, 2022 at 12:00 pm (Virtual)

Dr. Richard Windmill, The Open University

November 30, 2022 at 12:00 pm (Virtual)

Dr. Natasha Almeida, Natural History Museum

December 7, 2022 at 12:00 pm (Virtual)

The coordinator for the Colloquium Series is Dr. Jan Hellmann. You can contact him at hellmann [at] umd [dot] edu.