| DOI: | 10.1016/j.icarus.2019.113447
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| 论文题名: | The spatial signature of a changing ancient impactor population for Mars |
| 作者: | Holo S.; Kite E.
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| 刊名: | Icarus
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| ISSN: | 191035
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| 出版年: | 2020
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| 卷: | 337 | | 语种: | 英语
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| 英文关键词: | Early Mars
; Impactor populations
; Resurfacing
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| 英文摘要: | Ancient solar system processes are recorded by impact crater populations on Mars. We investigated the spatial distribution of Noachian-aged (3.8–4.0 Ga) craters in order to test hypotheses for the shortage of <32 km diameter craters. Using (i) a global database of Mars impact craters and (ii) angular two-point correlation statistics to quantify local to regional crater clustering, we found that degraded craters on low-lying middle-Noachian-highland terrains were subject to spatially-patchy crater obliteration by surface processes, while older, higher-standing craters on the early Noachian highlands remain consistent with being drawn from a spatially uniform distribution. This result supports the hypothesis that the multi-sloped Noachian crater size-frequency distribution results from an early impactor population that changed during the Noachian, rather than from extensive obliteration of craters <32 km in diameter by surface processes such as fluvial erosion, volcanic flooding, and aeolian infilling. The cause of the change in impactor populations remains unknown. © 2019 Elsevier Inc. |
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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/159887
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| Appears in Collections: | 气候变化与战略
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作者单位: | Department of Geophysical Sciences, University of Chicago, 5734 S. Ellis Ave., Chicago, IL 60637, United States
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| Recommended Citation: | |
Holo S.,Kite E.. The spatial signature of a changing ancient impactor population for Mars[J]. Icarus,2020-01-01,337
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