DOI: 10.1029/2017JE005516
Scopus记录号: 2-s2.0-85052371757
论文题名: Observations From a Global Database of Impact Craters on Mercury With Diameters Greater than 5 km
作者: Herrick R.R. ; Bateman E.M. ; Crumpacker W.G. ; Bates D.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 8 起始页码: 2089
结束页码: 2109
语种: 英语
英文关键词: crater morphology
; cratering
; database
; Mercury
; surface ages
Scopus关键词: Mercuria
英文摘要: We created a global database of Mercurian impact craters with diameters over 5 km, excluding obvious secondary craters. For craters over 10 km in diameter, we assessed basic morphological parameters, including an evaluation of whether significant postimpact filling occurred, the nature of any central structure, a three-point assessment of degradation state, and a recording of the presence of rays and other atypical features. We used the database to evaluate the spatial patterns of different subsets of the crater population. The distribution of craters with diameters of 5 to 10 km compared to the distribution of larger craters shows many background secondaries associated with primary craters with diameters over 150 km, and their abundance would distort crater counts for surface dating. Counting only unfilled craters gives an estimate of the last possible date of endogenic geologic activity on a surface. Only a third of craters with diameters over 20 km are classified as unfilled, and the highest spatial density of unfilled craters is about half the total population at the same location. Our results support a globally rapid cessation in volcanism, with variations in the volume of late stage volcanism accounting for variations in the number of filled craters. We see regional variations of interior morphology for craters ~100 km in diameter that do not obviously correlate with other patterns derived from surface observations; our observations imply that there are variations in the mechanical properties of the upper several kilometers of crust. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113321
Appears in Collections: 气候减缓与适应
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作者单位: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Herrick R.R.,Bateman E.M.,Crumpacker W.G.,et al. Observations From a Global Database of Impact Craters on Mercury With Diameters Greater than 5 km[J]. Journal of Geophysical Research: Planets,2018-01-01,123(8)