Martian Meteorite Launch: High-Speed Ejecta from Small Craters

  title={Martian Meteorite Launch: High-Speed Ejecta from Small Craters},
  author={James Norman Head and H. Jay Melosh and Boris A. Ivanov},
  pages={1752 - 1756}
We performed high-resolution computer simulations of impacts into homogeneous and layered martian terrain analogs to try to account for the ages and characteristics of the martian meteorite collection found on Earth. We found that craters as small as ∼3 kilometers can eject ∼107 decimeter-sized fragments from Mars, which is enough to expect those fragments to appear in the terrestrial collection. This minimum crater diameter is at least four times smaller than previous estimates and depends on… 
Nature of the Martian uplands: Effect on Martian meteorite age distribution and secondary cratering
Abstract— Martian meteorites (MMs) have been launched from an estimated 5–9 sites on Mars within the last 20 Myr. Some 80–89% of these launch sites sampled igneous rock formations from only the last
Timescales of shock processes in chondritic and martian meteorites
The peak pressure experienced and the duration of impact in a chondrite and a martian meteorite are determined, and the data is combined with impact scaling laws to infer the sizes of the impactors and the associated craters on the meteorite parent bodies.
Combining meteorites and missions to explore Mars
The history inferred from martian meteorites conflicts with results from recent Mars missions, calling into doubt whether the igneous histor y inferred from the meteorites is applicable to Mars as a whole.
Earth retains the poorest record of impact craters through geologic time. Important clues of the occurrence of large impact events through Earth’s geologic history come from the presence of preserved
The Tharsis mantle source of depleted shergottites revealed by 90 million impact craters
It is shown that Tooting and 09-000015 craters are the most likely source of the depleted shergottites ejected 1.1 million year ago, implying that a major thermal anomaly deeply rooted in the mantle under Tharsis was active over most of the geological history of the planet, and has sampled a depleted mantle, that has retained until recently geochemical signatures of Mars’ early history.


Lunar and Martian Meteorite Delivery Services
Launch mechanisms for lunar and martian meteorites have been investigated, by integrating physical modeling constraints, geochemical cosmic-ray exposure (CRE) constraints, and petrologic constraints.
Destination: Earth. Martian Meteorite Delivery
Abstract The delivery dynamics of martian meteorites are examined by means of a direct numerical simulation of their orbital evolution. The dynamics in the martian region are dominated by secular
The Large Crater Origin of SNC Meteorites
The results indicate that the SNC meteorites were probably ejected from a very large crater about 200 million years ago, and that cosmic-ray exposure of the recovered meteorites was initiated after collisional fragmentation of the original ejecta in space at much later times.
Orbital evolution of impact ejecta from Mars.
The orbital evolution of material ejected from Mars into heliocentric orbits is investigated, with particular emphasis on the origin of the shergottite, nakhlite, and chassignite achondrites. Two
Martian cratering VI: Crater count isochrons and evidence for recent volcanism from Mars Global Surveyor
Abstract— This paper develops a methodology to establish absolute Martian ages by deriving isochrons on a plot of Martian impact crater density vs. crater diameter, calibrated by lunar crater/age
The Exchange of Impact Ejecta Between Terrestrial Planets
Orbital histories of ejecta from the terrestrial planets were numerically integrated to study their transfer to Earth. The properties of the lunar and martian meteorites are consistent with a
Atmospheric impact processes
The Shergottite age paradox and the relative probabilities for Martian meteorites of differing ages
The apparent paradox that the majority of impacts yielding Martian meteorites appear to have taken place on only a few percent of the Martian surface can be resolved if all the shergottites were