Composition of the lunar magma ocean constrained by the conditions for the crust formation
書誌事項
- 公開日
- 2014-02
- 資源種別
- journal article
- 権利情報
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- https://www.elsevier.com/tdm/userlicense/1.0/
- DOI
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- 10.1016/j.icarus.2013.10.031
- 公開者
- Elsevier BV
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説明
Abstract The present study aims to constrain the composition of the initial lunar magma ocean (LMO) with fluid dynamic and thermodynamic consideration. A plausible range of the initial LMO composition is investigated by developing an incremental polybaric fractional crystallization model with variable fractionation efficiency to satisfy three conditions for the anorthosite crust formation: (1) the amount of anorthite crystallized from the LMO is abundant enough to form the crust with the observed thickness, (2) the Mg# (=Mg/(Mg + Fe)) of orthopyroxene crystallized with anorthite in the cooling LMO is consistent with that observed in the lunar highland rocks, ferroan anorthosite, and (3) crystallized anorthite separated to float in the turbulent LMO. A plausible range of FeO and Al 2 O 3 contents of the bulk LMO is successfully constrained as a crescent region tight for FeO and loose for Al 2 O 3 . The FeO content must be higher than 1.3 times the bulk silicate Earth (BSE) and lower than 1.8 ×BSE unless the Al 2 O 3 content of the Moon is extremely higher than the Earth. These upper and lower limits for FeO are positively correlated with the initial Al 2 O 3 content and fractionation efficiency. The FeO–rich LMO composition may suggest that the circum-Earth disk just after the giant impact of the Earth–Moon system formation was more oxidizing or the impactor was richer in FeO than the Earth’s mantle.
収録刊行物
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- Icarus
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Icarus 229 45-56, 2014-02
Elsevier BV
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詳細情報 詳細情報について
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- CRID
- 1360004232184308352
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- ISSN
- 00191035
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
