2021/03/08 by Jean-Alix Barrat, Jean‐Alix Barrat, Marc Chaussidon +7
Physics and Astronomy · #Accretion (finance) #Andesite #Astro and Planetary Science #Astrobiology #Astrophysics #Chondrite #Chondrule #Crust #Geochemistry #Geology #Igneous rock #Meteorite #Parent body #Partial melting #Physics #Planet #Planetary Science and Exploration #Protoplanet #Protoplanetary disk #Stellar, planetary, and galactic studies #Volcanic rock #Volcano #astro-ph.EP #astro-ph.GA #physics.geo-ph
paper · pdf · doi:10.1073/pnas.2026129118
published as Proceeding of the National Academy of Science 2021
openalex publication_date 2021/03/08 · arxiv created 2021/05/05 · arxiv updated 2021/05/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Significance The crusts of the oldest protoplanets are virtually unknown due to the scarcity of samples. Here, we describe the oldest known lava that crystallized ca. 4,565 Ma ago and formed by partial melting of a chondritic parent body. 26 Al- 26 Mg systematics suggest that the elapsed time between melting and crystallization was significant, on the order of several 10 5 y, probably due to the viscosity of the magma. Although the first protoplanetary crusts were frequently not basaltic, their remains are not detected in the asteroid belt because their parent bodies served as the building blocks for larger rocky bodies or were nearly totally destroyed.