Origine et évolution des éléments volatils accrétés par les corps planétaires du système solaire interne
Year: 2022
Type: dissertation
Abstract: Volatile elements such as hydrogen, carbon, and nitrogen were essential for the emergence of life on Earth. However, the origin of these elements accreted by planetary bodies of the inner solar system as well as their behavior, distribution, and inventory in deep planetary reservoirs remain controversial. Recent analytical developments in noble gas mass spectrometry and secondary ion mass spectrometry have allowed me to accurately determine the abundance and isotopic composition of nitrogen trapped in terrestrial volcanic rocks, meteorites (chondrites, achondrites, iron meteorites), samples brought back to Earth by space missions as well as in synthetic samples. In parallel, based on measurements of noble gases in meteorites and lunar rocks, I was able to quantify isotopic modifications induced by the solar wind and cosmic rays. Experimental studies have provided complementary information on the effect(s) of various physico-chemical parameters on the behavior and isotopic fractionation of nitrogen during planetary differentiation. My research activity has thus mainly focused on tracing the origin and evolution of volatile elements and the chronology of their accretion by Earth, the Moon, and other planetary bodies. The results of my work demonstrate the complexity of the processes that govern the abundance and isotopic signature of volatile elements in rocks of various provenance: Earth's ocean floor, the lunar maria or the asteroid belt and beyond.
Source: HAL
Author: Füri, Evelyn
Language: English
Topic: Astro and Planetary Science
Subfield: Space and Planetary Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4392494957