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Comparisons of fresh complex impact craters on Mercury and the Moon: Implications for controlling factors in impact excavation processes

Xiao, Z. und Strom, R. G. und Chapman, C.R. und Head, J.W. und Klimczak, C. und Ostrach, L. R. und Helbert, Jörn und D'Incecco, Piero (2014) Comparisons of fresh complex impact craters on Mercury and the Moon: Implications for controlling factors in impact excavation processes. Icarus: International Journal of Solar System Studies, 228, Seiten 260-275. Elsevier. doi: 10.1016/j.icarus.2013.10.002. ISSN 0019-1035.

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Kurzfassung

The impact cratering process is usually divided into the coupling, excavation, and modification stages, where each stage is controlled by a combination of different factors. Although recognized as the main factors governing impact processes on airless bodies, the relative importance of gravity, target and projectile properties, and impact velocity in each stage is not well understood. We focus on the excavation stage to place better constraints on its controlling factors by comparing the morphology and scale of crater-exterior structures for similar-sized fresh complex craters on the Moon and Mercury. We find that the ratios of continuous ejecta deposits, continuous secondaries facies, and the largest secondary craters on the continuous secondaries facies between same-sized mercurian and lunar craters are consistent with predictions from gravity-regime crater scaling laws. Our observations support that gravity is a major controlling factor on the excavation stage of the formation of complex impact craters on the Moon and Mercury. On the other hand, similar-sized craters with identical background terrains on Mercury have different spatial densities of secondaries on the continuous secondaries facies, suggesting that impactor velocity may also be important during the excavation stage as larger impactor velocity may also cause greater ejection velocities. Moreover, some craters on Mercury have more circular and less clustered secondaries on the continuous secondaries facies than other craters on Mercury or the Moon. This morphological difference appears not to have been caused by the larger surface gravity or the larger median impact velocity on Mercury. A possible interpretation is that at some places on Mercury, the target material might have unique properties causing larger ejection angles during the impact excavation stage. We conclude that gravity is the major controlling factor on the impact excavation stage of complex craters, while impact velocity and target properties also affect the excavation stage but to a lesser extent than gravity.

elib-URL des Eintrags:https://elib.dlr.de/94323/
Dokumentart:Zeitschriftenbeitrag
Titel:Comparisons of fresh complex impact craters on Mercury and the Moon: Implications for controlling factors in impact excavation processes
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Xiao, Z.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Strom, R. G.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Chapman, C.R.Southwest Research Institute, Boulder, CO, USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Head, J.W.Department of Geological Sciences, Brown University, Providence, RI, USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Klimczak, C.Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D. C., USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ostrach, L. R.School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505NICHT SPEZIFIZIERT
D'Incecco, Pieropiero.dincecco (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Januar 2014
Erschienen in:Icarus: International Journal of Solar System Studies
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:228
DOI:10.1016/j.icarus.2013.10.002
Seitenbereich:Seiten 260-275
Verlag:Elsevier
ISSN:0019-1035
Status:veröffentlicht
Stichwörter:Impact crater, Mercury, Moon
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben BepiColombo (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Experimentelle Planetenphysik
Hinterlegt von: Helbert, Dr.rer.nat. Jörn
Hinterlegt am:08 Jan 2015 13:46
Letzte Änderung:10 Jan 2019 15:47

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