| DOI: | 10.1016/j.epsl.2018.02.033
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| Scopus记录号: | 2-s2.0-85042940339
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| 论文题名: | A thin, dense crust for Mercury |
| 作者: | Sori M.M.
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| 刊名: | Earth and Planetary Science Letters
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| ISSN: | 0012821X
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| 出版年: | 2018
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| 卷: | 489 | | 起始页码: | 92
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| 结束页码: | 99
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| 语种: | 英语
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| 英文关键词: | crustal density
; crustal thickness
; gravity
; isostasy
; Mercury
; MESSENGER
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| Scopus关键词: | Geodesy
; Geology
; Gravitation
; Iodine
; Planetary surface analysis
; Silicates
; Structural geology
; Compensation mechanism
; Crustal thickness
; Elemental abundance
; Geophysical parameters
; isostasy
; MESSENGER
; Southern Hemisphere
; Terrestrial planets
; Mercury (metal)
; crustal thickness
; gravity field
; isostasy
; mantle structure
; Mercury (planet)
; silicate
; solar system
; topography
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| 英文摘要: | Crustal thickness is a crucial geophysical parameter in understanding the geology and geochemistry of terrestrial planets. Recent development of mathematical techniques suggests that previous studies based on assumptions of isostasy overestimated crustal thickness on some of the solid bodies of the solar system, leading to a need to revisit those analyses. Here, I apply these techniques to Mercury. Using MESSENGER-derived elemental abundances, I calculate a map of grain density (average 2974 ± 89 kg/m3) which shows that Pratt isostasy is unlikely to be a major compensation mechanism of Mercury's topography. Assuming Airy isostasy, I find the best fit value for Mercury's mean crustal thickness is 26 ± 11 km, 25% lower than the most recently reported and previously thinnest number. Several geological implications follow from this relatively low value for crustal thickness, including showing that the largest impacts very likely excavated mantle material onto Mercury's surface. The new results also show that Mercury and the Moon have a similar proportion of their rocky silicates composing their crusts, and thus Mercury is not uniquely efficient at crustal production amongst terrestrial bodies. Higher resolution topography and gravity data, especially for the southern hemisphere, will be necessary to refine Mercury's crustal parameters further. © 2018 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/109979
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| 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: | Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, United States
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| Recommended Citation: | |
Sori M.M.. A thin, dense crust for Mercury[J]. Earth and Planetary Science Letters,2018-01-01,489
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