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Modeling the evolution of the parent body of acapulcoites and lodranites: a case study for partially differentiated asteroids

The acapulcoites and lodranites are rare groups of primitive achondrites that originate from a common parent body and are of particular interest since they experienced only partial melting. We calculated thermal evolution and differentiation models of the parent body of the Acapulco-Lodran meteorite...

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Main Authors: Neumann, Wladimir (Author) , Henke, Stephan-Markus (Author) , Gail, Hans-Peter (Author) , Schwarz, Winfried H. (Author) , Trieloff, Mario (Author) , Hopp, Jens (Author)
Format: Article (Journal)
Language:English
Published: 30 March 2018
In: Icarus
Year: 2018, Volume: 311, Pages: 146-169
ISSN:0019-1035
DOI:10.1016/j.icarus.2018.03.024
Online Access:Verlag, Volltext: https://doi.org/10.1016/j.icarus.2018.03.024
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0019103517305468
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Author Notes:Wladimir Neumann, Stephan Henke, Doris Breuer, Hans-Peter Gail, Winfried H. Schwarz, Mario Trieloff, Jens Hopp, Tilman Spohn

MARC

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520 |a The acapulcoites and lodranites are rare groups of primitive achondrites that originate from a common parent body and are of particular interest since they experienced only partial melting. We calculated thermal evolution and differentiation models of the parent body of the Acapulco-Lodran meteorite clan. The models were compared to the maximum metamorphic temperatures, differentiation degree, and thermo-chronological data available. An optimized set of parameters which fits to the data was determined: A radius of≈260km, a formation time of≈1.7 Ma after CAIs and an initial temperature of≈250K. The burial depths derived are 7-13km. The respective layers experienced minor melting and small-scale melt migration, matching the differentiation degree of the meteorites. The resulting structure has an iron core, a silicate mantle, a partially differentiated layer, and an undifferentiated outer shell. Our results indicate a larger size, an earlier formation time, and a formation closer to the sun of the parent body of acapulcoites and lodranites than typical estimates for ordinary chondritic parent bodies, consistent with a stronger thermal metamorphism. The burial depths support excavation by a single impact. The presence of core and mantle indicates that these meteorites could share a common parent body with differentiated stony and iron meteorites. 
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