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 Citations (Scopus)

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 publicationAIP Conference Proceedings
Pages1371-1374
Number of pages4
Volume955
DOIs
StatePublished - 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

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

Fingerprint

SNC meteorites
meteorites
ejection
shock
escape velocity
ejecta
asteroids
comets
mars
Curie temperature
low pressure
vapors
magnetic properties
heat

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

DeCarli, P. S., Goresy, A. E., Xie, Z., & Sharp, T. (2007). Ejection mechanisms for Martian meteorites. In AIP Conference Proceedings (Vol. 955, pp. 1371-1374) https://doi.org/10.1063/1.2832979

Ejection mechanisms for Martian meteorites. / DeCarli, P. S.; Goresy, A. El; Xie, Z.; Sharp, Thomas.

AIP Conference Proceedings. Vol. 955 2007. p. 1371-1374.

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

DeCarli, PS, Goresy, AE, Xie, Z & Sharp, T 2007, Ejection mechanisms for Martian meteorites. in AIP Conference Proceedings. vol. 955, pp. 1371-1374, 15th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter, SCCM 2007, Waikoloa, HI, United States, 6/24/07. https://doi.org/10.1063/1.2832979
DeCarli PS, Goresy AE, Xie Z, Sharp T. Ejection mechanisms for Martian meteorites. In AIP Conference Proceedings. Vol. 955. 2007. p. 1371-1374 https://doi.org/10.1063/1.2832979
DeCarli, P. S. ; Goresy, A. El ; Xie, Z. ; Sharp, Thomas. / Ejection mechanisms for Martian meteorites. AIP Conference Proceedings. Vol. 955 2007. pp. 1371-1374
@inproceedings{1ba4520317314b278664ec2cf58ad7f2,
title = "Ejection mechanisms for Martian meteorites",
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.",
keywords = "Artificial viscosity, Hydrocode, Martian meteorites, Meteorite ejection mechanisms",
author = "DeCarli, {P. S.} and Goresy, {A. El} and Z. Xie and Thomas Sharp",
year = "2007",
doi = "10.1063/1.2832979",
language = "English (US)",
isbn = "9780735404694",
volume = "955",
pages = "1371--1374",
booktitle = "AIP Conference Proceedings",

}

TY - GEN

T1 - Ejection mechanisms for Martian meteorites

AU - DeCarli, P. S.

AU - Goresy, A. El

AU - Xie, Z.

AU - Sharp, Thomas

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

KW - Artificial viscosity

KW - Hydrocode

KW - Martian meteorites

KW - Meteorite ejection mechanisms

UR - http://www.scopus.com/inward/record.url?scp=71849116537&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=71849116537&partnerID=8YFLogxK

U2 - 10.1063/1.2832979

DO - 10.1063/1.2832979

M3 - Conference contribution

SN - 9780735404694

VL - 955

SP - 1371

EP - 1374

BT - AIP Conference Proceedings

ER -