globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.11.023
Scopus记录号: 2-s2.0-85037332648
论文题名:
Thermal effects of late accretion to the crust and mantle of Mercury
作者: Mojzsis S.J.; Abramov O.; Frank E.A.; Brasser R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482
起始页码: 536
结束页码: 544
语种: 英语
英文关键词: bombardment ; high-magnesium region ; impacts ; komatiite ; late accretion ; Mercury
Scopus关键词: Magnesium ; Melting ; Silicates ; Solar system ; bombardment ; high-magnesium region ; impacts ; Komatiite ; Late accretions ; Mercury (metal) ; accretion ; crust ; komatiite ; magnesium ; mantle ; Mercury (planet) ; temperature effect ; Mercuria
英文摘要: Impact bombardment on Mercury in the solar system's late accretion phase (ca. 4.4–3.8 Ga) caused considerable mechanical, chemical and thermal reworking of its silicate reservoirs (crust and mantle). Depending on the frequency, size and velocity of such impactors, effects included regional- and global-scale crustal melting, and thermal perturbations of the mercurian mantle. We use a 3D transient heating model to test the effects of two bombardment scenarios on early (pre-Tolstojan) Mercury's mantle and crust. Results show that rare impacts by the largest (≳100 km diameter) bodies deliver sufficient heat to the shallow mercurian mantle producing high-temperature ultra-magnesian (komatiitic s.s.) melts. Impact heating leading to effusive (flood) volcanism can account for the eponymous “high-magnesium region” (HMR) observed during the MErcury Surface, Space Environment, GEochemistry Ranging (MESSENGER) mission. We find that late accretion to Mercury induced volumetrically significant crustal melting (≤58 vol.%), mantle heating and melt production, which, combined with extensive resurfacing (≤100%), also explains why its oldest cratering record was effectively erased, consistent with crater-counting statistics. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110100
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Geological Sciences, University of Colorado, UCB 399, 2200 Colorado Avenue, Boulder, CO 80309, United States; Institute for Geological and Geochemical Research, Research Center for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 45 Budaörsi Street, Budapest, H-1112, Hungary; Planetary Science Institute, 1700 East Fort Lowell Road, Suite 106, Tucson, AZ 85719, United States; Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Rd, Washington, DC 20015, United States; Earth-Life Science Institute, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan

Recommended Citation:
Mojzsis S.J.,Abramov O.,Frank E.A.,et al. Thermal effects of late accretion to the crust and mantle of Mercury[J]. Earth and Planetary Science Letters,2018-01-01,482
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