PRL PLATINUM PLANETARY SEMINAR SERIES - PPPSS

Title : Primordial noble gas component hosted by water-susceptible materials in less-altered CR chondrites

Date : 16-06-2022
Time : 14:30:00
Speaker : Dr. Tomoya Obase, Hokkaido University, Japan.
Area : Planetary Sciences Division
Venue : Online

Abstract

Previous studies of noble gases in primitive meteorites have focused primarily on acid-resistant phases that contain most of the noble gases in the primitive meteorites. However, a new Ne-rich noble gas component hosted by water-susceptible materials was recently found in some aqueously less-altered CR chondrites. In this seminar, I will talk about the potential relationship between the Ne-rich materials in CR chondrites and cometary materials. The talk also briefly introduces basic knowledge of noble gases in primitive meteorites and why noble gases are unique tracers in cosmochemistry.

Title : How hot and wet is the Moon: Insight from experiments

Date : 02-06-2022
Time : 10:00:00
Speaker : Dr. Ananya Mallik, Assistant Professor, (The RealReal Inc. Endowed Chair in Gem Science), Department of Geosciences, University of Arizona, Tucson, Arizona, USA
Area : Planetary Sciences Division
Venue : Online

Abstract

The thermal profile of the Moon (selenotherm) is required to determine its present-day interior structure and composition, and yet it is not constrained well. How can we constrain the selenotherm better? Also, measurements on lunar samples indicate that the Moon is not ‘bone dry’ but does have some hydrogen in its interior. The bulk lunar hydrogen is an important constraint to understand the dynamics of the Moon-forming impact as well as determine the origin of volatiles in the Earth-Moon system. The estimates of bulk lunar hydrogen span across a few orders of magnitude, but how can we constrain it better? In this talk, I will discuss how we can better estimate both the thermal state and the bulk lunar hydrogen to improve our understanding of lunar evolution.