期刊
ICARUS
卷 311, 期 -, 页码 146-169出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2018.03.024
关键词
Asteroids; Composition; Meteorites; Planetesimals; Accretion; Interiors; Thermal histories
资金
- special research program The First 10 Million Years of the Solar System - a Planetary Materials Approach - Deutsche Forschungsgemeinschaft (DFG) [GA 162/4-1/2/3, BR 1602/6-1/2/3, 1385]
- special research program Building a Habitable Earth - Deutsche Forschungsgemeinschaft (DFG) [NE 2055/1-1, 1833]
- Klaus Tschira Stiftung GmbH [00.243.2013]
- Collaborative Research Centre [SFB-TRR 170]
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 approximate to 260 km, a formation time of approximate to 11.7 Ma after CAIs and an initial temperature of approximate to 250 K. The burial depths derived are 7-13 km. 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. (C) 2018 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据