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Formation of primitive achondrites by partial melting of alkali-undepleted planetesimals in the inner solar system

Collinet, Max and Grove, Timothy (2020) Formation of primitive achondrites by partial melting of alkali-undepleted planetesimals in the inner solar system. Geochimica et Cosmochimica Acta, 277, pp. 358-376. Elsevier. doi: 10.1016/j.gca.2020.03.004. ISSN 0016-7037.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0016703720301654


Acapulcoites-lodranites, ureilites, brachinites, brachinite-like achondrites and winonaites are the main groups of primitive achondrites. They are variably depleted in incompatible lithophile elements (Al, Na, K and rare earth elements) and siderophile/chalcophile elements relative to chondrites and are interpreted as the residual mantle of planetesimals from which silicate melts and sulfide/metal melts were extracted. We use a series of melting experiments conducted with various chondritic compositions (CV, CM, CI, H and LL) to constrain the oxygen fugacity (fO2), the temperature, extent of melting and the initial bulk composition of the parent bodies of primitive achondrites. They melted at different and variable fO2: ΔIW −0.5/−1.0 for brachinites, ΔIW −1.3/−2.5 for ureilites, ΔIW −1.6/−2.7 for acapulcoites/lodranites and ΔIW −2.5/−3.0 for winonaites (with ΔIW = log fO2 – (log fO2)IW; IW being the iron-wustite buffer). Those main groups of primitive achondrites, which have nucleosynthetic anomalies characteristic of the “non-carbonaceous” reservoir and the inner solar system, were not initially depleted in Na2O and K2O relative to the sun’s photosphere. This suggests, in accordance with the enrichment in the heavy isotopes of Zn, Rb and K in eucrites, that the depletion of moderately volatile elements in planetesimals that melted to a larger extent (e.g. Vesta, the angrite parent body) resulted from evaporative losses during partial melting. The depletion of moderately volatile elements in terrestrial planets is likely inherited from partial melting and differentiation of small planetary bodies rather than from the incomplete condensation of the solar nebula.

Item URL in elib:https://elib.dlr.de/137523/
Document Type:Article
Title:Formation of primitive achondrites by partial melting of alkali-undepleted planetesimals in the inner solar system
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Collinet, Maxmax.collinet (at) dlr.dehttps://orcid.org/0000-0002-8791-9751
Grove, TimothyDept. of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambrige, USAUNSPECIFIED
Journal or Publication Title:Geochimica et Cosmochimica Acta
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.gca.2020.03.004
Page Range:pp. 358-376
Keywords:Differentiated meteorites, Planetary differentiation, Planetary accretion, Protoplanetary disk, Asteroids, Residue
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System, R - Vorhaben Planetary Evolution and Life (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Plesa, Dr. Ana-Catalina
Deposited On:17 Nov 2020 09:59
Last Modified:17 Nov 2020 09:59

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