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Related Experiment Video

Updated: Jun 17, 2026

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Published on: June 13, 2015

Graphite-Based Geothermometry on Almahata Sitta Ureilitic Meteorites.

Anna Barbaro¹, M Chiara Domeneghetti¹, Cyrena A Goodrich²

¹Department of Earth and Environmental Sciences, University of Pavia, 27100 Pavia, Italy.

Minerals (Basel, Switzerland)

|March 15, 2021

Summary

Ureilite meteorites reveal shock event temperatures through graphite analysis. Micro-Raman spectroscopy indicates these temperatures resulted from impact events, not primary igneous processes.

Keywords:

carbon phases graphite graphite geothermometer meteorites shock event ureilites

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Atom Probe Tomography Analysis of Exsolved Mineral Phases

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Published on: October 25, 2019

Area of Science:

* Planetary Science
* Geochemistry
* Mineral Physics

Background:

* Ureilite meteorites offer insights into early Solar System formation and evolution.
* The thermal history of carbon phases (graphite, diamond) is crucial for understanding parent body processes.
* Previous studies suggested impact events formed graphite-diamond assemblages in some ureilites.

Purpose of the Study:

* To determine the thermal history of graphite in Almahata Sitta (AhS) ureilite meteorites.
* To investigate the origin of observed carbon phases and their relation to parent body events.
* To differentiate between temperatures from igneous processes and shock events.

Main Methods:

* Micro-Raman spectroscopy was employed for geothermometry on graphite samples.
* Analysis focused on graphite G-band peak centers and full width at half maximum values.
* Samples included AhS ureilites: AhS 72, AhS 209b, and AhS A135A.

Main Results:

* Graphite crystallization temperatures ranged from 1242 °C to 1332 °C.
* Disordered graphite exhibited a nanometric crystalline domain size (70–140 nm).
* These characteristics suggest the recorded temperatures are linked to shock events.

Conclusions:

* The thermal data indicate shock events significantly influenced the ureilite parent body.
* The nanometric grain size of recrystallized graphite supports a shock origin.
* Temperatures recorded are likely from impact events, not primary igneous activity.