Ejection mechanisms for Martian meteorites

P. S. DeCarli, A. El Goresy, Z. Xie, Thomas Sharp

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

At least 35 meteorites have been identified as Martian. The Martian origin of these meteorites is not in dispute. It is generally accepted that the meteorites were ejected from Mars as a result of asteroid or comet impacts. However, there is no agreement on the detailed mechanism by which these meteorites were accelerated to the Martian escape velocity of 5 km/s. The simplest mechanism, that the meteorites were accelerated by a strong shock, implies a minimum shock pressure of about 65 GPa. Evidence from the meteorites themselves implies that none of them has been subjected to shock pressures in excess of about 45 GPa. Measurements of the magnetic properties of Martian meteorite ALH 84001 indicate that the ejection event did not heat it above its curie temperature of about 40 C, implying a maximum shock pressure during ejection of less than 15 GPa. We have not been able to reproduce recent calculations that predict low-pressure shock ejection at high velocity. We explore the possibility that Martian meteorites are accelerated to escape velocity in a high velocity vapor or ejecta cloud.

Original languageEnglish (US)
Title of host publicationShock Compression of Condensed Matter - 2007
Subtitle of host publicationProceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, 2007 APS SCCM
PublisherAmerican Institute of Physics Inc.
Pages1371-1374
Number of pages4
ISBN (Print)9780735404694
DOIs
StatePublished - Jan 1 2007
Event15th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter, SCCM 2007 - Waikoloa, HI, United States
Duration: Jun 24 2007Jun 29 2007

Publication series

NameAIP Conference Proceedings
Volume955
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other15th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter, SCCM 2007
CountryUnited States
CityWaikoloa, HI
Period6/24/076/29/07

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Keywords

  • Artificial viscosity
  • Hydrocode
  • Martian meteorites
  • Meteorite ejection mechanisms

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

Cite this

DeCarli, P. S., Goresy, A. E., Xie, Z., & Sharp, T. (2007). Ejection mechanisms for Martian meteorites. In Shock Compression of Condensed Matter - 2007: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, 2007 APS SCCM (pp. 1371-1374). (AIP Conference Proceedings; Vol. 955). American Institute of Physics Inc.. https://doi.org/10.1063/1.2832979