2012 Fiscal Year Final Research Report
Theoretical study on mantle overturn processes in the moon and small rocky planets.
| Project/Area Number |
22540427
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
TAKEHIRO Shin-ichi 京都大学, 数理解析研究所, 准教授 (30274426)
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| Research Collaborator |
FUKUI Takashi 北海道大学, 大学院・理学院, 大学院理学院
ADACHI Toshitaka 北海道大学, 大学院・理学院, 院生
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| Project Period (FY) |
2010 – 2012
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| Keywords | 月 / マグマオーシャン / マントルオーバーターン / マントル対流 / 水星 / 熱史 / 慣性能率 |
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| Research Abstract |
Theoretical and numerical studies on the evolution of the interiors of the Moon and small rocky planets were performed on the basis of the consideration about the variety of raw materials of these bodies by using a model of proto-planetary disk. A series of cumulate rock layers, formed in the early Moon due to cooling and solidification of a magma ocean, should have overturned toward stable structure. During the overturn process, Mg-rich olivine cumulate likely becomes to melt again, which is consistent with the exposure of Mg-rich mafic minerals on the lunar far-side. The present moment of inertia factor of the Moon is explained by the density profile after the completion of overturn. Recent spacecraft data shows that Mercury has a significantly reduced composition enriched in sulfur as well as E-chondrites, which is consistent with our disk model, and also has a thin silicate mantle with thickness less than about 400 km. We performed thermal history simulations considering such a new structure. It is suggested that the liquid core of Mercury is thermally convective until present, allowing dynamo action producing the intrinsic magnetic field of Mercury.
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[Journal Article] The Science Objectives ofJapanese Lunar Lander Project SELENE-II2011
Author(s)
Tanaka, S. Mitani, T. Iijima, Y. Otake, H. Ogawa, K. Kobayashi, N. Hashimoto, T. Hoshino, T. Otsuki, M. Kimura, J. and Kuramoto , K
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Journal Title
42nd Lunar and Planetary Science Conference
Pages: 2778
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[Presentation] Present Status of the Lunar Lander Project SELENE-22013
Author(s)
Tanaka, S. Mitani, T. Otake, H. Ogawa, K. Kobayashi, N. Hashimoto, T. Hoshino, T. Otsuki, M. Wakabayashi, S. Kimura, J. and Kuramoto , K.
Organizer
44th Lunar and Planetary Science Conference
Place of Presentation
The Woodlands Waterway Marriott Hotel and Convention Center (USA)
Year and Date
20130318-20130322
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[Presentation] 次期月探査計画SELENE-2の現状と科学搭載機器の開発状況2012
Author(s)
田中智,三谷烈史,大嶽久志,小川和律,小林直樹,飯島祐一,橋本樹明,星野健,大槻真嗣,木村淳,倉本圭,佐伯和人
Organizer
地球惑星科学連合大会2012
Place of Presentation
幕張メッセ(千葉市)
Year and Date
20120520-20120525
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[Presentation] Overview of Candidate Instruments On Board the Lunar Lander Project SELENE-22012
Author(s)
Tanaka, S. Mitani, T. Iijima, Y. Otake, H. Ogawa, K. Kobayashi,N. Hashimoto, T. Otsuki, M. Kimura,J. and Kuramoto, K
Organizer
43rd Lunar and Planetary Science Conference
Place of Presentation
The Woodlands Waterway Marriott Hotel and Convention Center, Texas (USA)
Year and Date
20120319-23
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[Presentation] 次期月探査計画SELENE-2の検討状況2010
Author(s)
田中智,飯島祐一,三谷烈史,大嶽久志,小川和律,小林直樹,橋本樹明,星野健,大槻正嗣,木村淳,倉本圭
Organizer
日本惑星科学会2010年秋季講演会
Place of Presentation
名古屋大学(名古屋市)
Year and Date
2010-10-06
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