Trachyandesitic volcanism in the early Solar System
Open Access
- 18 August 2014
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 111 (35), 12689-12692
- https://doi.org/10.1073/pnas.1404799111
Abstract
Volcanism is a substantial process during crustal growth on planetary bodies and well documented to have occurred in the early Solar System from the recognition of numerous basaltic meteorites. Considering the ureilite parent body (UPB), the compositions of magmas that formed a potential UPB crust and were complementary to the ultramafic ureilite mantle rocks are poorly constrained. Among the Almahata Sitta meteorites, a unique trachyandesite lava (with an oxygen isotope composition identical to that of common ureilites) documents the presence of volatile- and SiO2-rich magmas on the UPB. The magma was extracted at low degrees of disequilibrium partial melting of the UPB mantle. This trachyandesite extends the range of known ancient volcanic, crust-forming rocks and documents that volcanic rocks, similar in composition to trachyandesites on Earth, also formed on small planetary bodies ∼4.56 billion years ago. It also extends the volcanic activity on the UPB by ∼1 million years (Ma) and thus constrains the time of disruption of the body to later than 6.5 Ma after the formation of Ca–Al-rich inclusions.Keywords
This publication has 28 references indexed in Scilit:
- Uranium isotope compositions of the basaltic angrite meteorites and the chronological implications for the early Solar SystemProceedings of the National Academy of Sciences of the United States of America, 2012
- Parent body depth–pressure–temperature relationships and the style of the ureilite anatexisMeteoritics & Planetary Science, 2012
- Asteroid 2008 TC3—Almahata Sitta: A spectacular breccia containing many different ureilitic and chondritic lithologiesMeteoritics & Planetary Science, 2010
- The oxygen isotope composition of Almahata SittaMeteoritics & Planetary Science, 2010
- CHROMIUM ISOTOPE SYSTEMATICS OF ACHONDRITES: CHRONOLOGY AND ISOTOPIC HETEROGENEITY OF THE INNER SOLAR SYSTEM BODIESThe Astrophysical Journal, 2010
- 53Mn–53Cr and 26Al–26Mg ages of a feldspathic lithology in polymict ureilitesEarth and Planetary Science Letters, 2010
- The impact and recovery of asteroid 2008 TC3Nature, 2009
- Early formation of evolved asteroidal crustNature, 2009
- Disequilibrium partial melting experiments on the Leedey L6 chondrite: Textural controls on melting processesMeteoritics & Planetary Science, 2001
- Explosive volcanism and the graphite-oxygen fugacity buffer on the parent asteroid(s) of the ureilite meteoritesIcarus, 1992