April 2024 Virtual Meeting

Monday, April 8, 2024
6:00 - 7:30 pm

Note: ETGS members participating virtually will receive an email with info for attending/logging into the meeting.


Award Winning Student Presentation

Thermal Evolution of Enstatite Chondrite and Aubrite Parent Bodies: Constraints from Silicate Geothermometry



Emily Etheridge
Department of Earth and Planetary Sciences
University of Tennessee, Knoxville
PhD Candidate


In this project we apply several geothermometers and geospeedometers to enstatite chondrites and aubrites to clarify the complex thermal history of their parent bodies. These meteorites, which have been interpreted to originate from the inner solar system, will help to constrain conditions on inner solar system parent bodies, such as peak temperatures, the temporal effects and distribution of short-lived radionuclides, and heating and cooling mechanisms that affected planetesimals, including potential fragmentation-reassembly events that appear to have disrupted several other meteorite parent bodies. Preliminary results agree with the suggestion that several parent bodies are required to explain the diversity in cooling history displayed by enstatite chondrites and aubrites.



Emily Etheridge is a first-year PhD student from Rhode Island studying igneous petrology and geochemistry. Her projects focus on high temperature and high pressure systems, from oceanic lithosphere lower crustal and upper mantle exposures along the Southern Mariana Trench Forearc to meteorites from various planetary bodies. She received her BS in Planetary Science from Marietta College in May of 2023, where she conducted preliminary analysis for the Martian Moons eXploration (MMX) Mission and examined howardite Larkman Nunatak 12326 to better understand surface mixing processes on asteroid 4Vesta. Emily aspires to become a professor after completing her PhD.

Greetings, and welcome to the April 8, 2024 ETGS virtual meeting.

If you attend via Zoom as a courtesy please mute your cell phone or the microphone in your laptop/tablet to minimize background noise and feedback echos. We will also make an effort to mute all participants - at least until the presentation is finished. Please use the chat feature to type any comments or questions you may have. We recommend that you send questions for the speaker to "everyone" so all participants can see the question. In the interest of time, we may hold the Q&A at the end of the presentation.

We will create an in-person and virtual attendance list. It is not always possible to tell who is participating on-line, especially for those joining by phone, so please email
etgs@live.com to be listed on the attendance sheet. Let us know exactly how your name should appear on the list. We will add a note explaining the lack of signatures due to remote participation and have an ETGS officer sign as usual.

Thank you for your patience and understanding as we try this online format. As always, we welcome and appreciate your feedback and suggestions for improvement.


ETGS News:

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ETGS Coffee & Beer Mugs...

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We look forward to seeing you at the next meeting.

ETGS is a volunteer organization. We need your help to continue serving those interested in the geology of East Tennessee and beyond. Please email us at
etgs@live.com if you would consider assisting in one of the following open positions. It is a great opportunity to expand your personal and professional network


Tony McClain

Vice President
David Carlone

J. Brad Stephenson

Seaira Stephenson

Webmaster/Social Media Coordinator
Bob Gelinas



Page updated April 01, 2024