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Impact melting upon basin formation on early Mars

Manske, Lukas and Marchi, S and Plesa, Ana-Catalina and Wünnemann, K. (2020) Impact melting upon basin formation on early Mars. Icarus. Elsevier. doi: 10.1016/j.icarus.2020.114128. ISSN 0019-1035.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S001910352030470X#!


The early bombardment history of Mars may have drastically shaped its crustal evolution. Impact-induced melting of crustal and mantle materials leads to the formation of local and regional melt ponds, and the cumulative effects of the impact flux could result in widespread melting of the crust. To quantify impact-melt production, its provenance and final distribution as a function of impact conditions, we carried out a systematic parameter study using the iSALE shock physics code. In contrast to simplified scaling laws for estimating the amount of melt generated by shock compression, we take the planet's thermal state at the time of impact into account. In addition, we consider decompression melting as a consequence of lithostatic uplift of initially deep-seated material. We find that the geothermal profile has a strong effect on melt production, and that melt volumes are significantly increased by up to a factor of seven in comparison to existing analytical estimates. Enhanced melting occurs at impactor sizes (and velocities) that deposit most of their energy at a depth close to the base of the lithosphere. Impactors larger than 10 km penetrate through the lithosphere and can generate a significant amount of melt by decompression due to lithostatic uplift, which can make up to 40% of the total melt volume. In some cases, the total melt volume exceeds the volume of the transient (and final) crater and the surface expression of these collisions may resemble large igneous provinces rather than typical craters.

Item URL in elib:https://elib.dlr.de/137550/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Impact melting upon basin formation on early Mars
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Manske, LukasMuseum für NaturkundeUNSPECIFIED
Plesa, Ana-CatalinaAna.Plesa (at) dlr.dehttps://orcid.org/0000-0003-3366-7621
Wünnemann, K.Museum für Naturkunde, Leibniz Institute for Research on Evolution and Biodiversity at the Humboldt University Berlin, Invalidenstr. 43, 10115 Berlin, GermanyUNSPECIFIED
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2020.114128
Keywords:Mars, impact melting, thermal evolution, melt production
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System, R - Vorhaben Planetary Evolution and Life (old), R - Project InSight - HP3
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Plesa, Dr. Ana-Catalina
Deposited On:17 Nov 2020 09:02
Last Modified:17 Nov 2020 09:02

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