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| SNC meteorites | |
|---|---|
| Name | SNC meteorites |
| Type | Achondrite |
| Class | Martian |
| Composition | Olivine, pyroxene, maskelynite, feldspar |
| Country | Various |
| Region | Various |
| Observed fall | Yes/No |
| Found date | Various |
| Total known weight | Various |
SNC meteorites are a historically defined grouping of achondritic meteorites proposed to share a common planetary origin. Originally distinguished by mineralogy, isotopic signatures, and trapped gases, the SNC grouping united several celebrated specimens that reshaped understanding of Mars and impacted studies across meteoritics, planetary science, and geochemistry. These meteorites have been central to debates involving Soviet Union era Antarctic expeditions, NASA missions, and multinational sample curation programs.
The SNC assemblage comprised three primary named members that attracted intense study: Shergotty, Nakhla, and Chassigny, each linked by petrographic features, oxygen isotopes, and noble gas compositions measured in laboratories such as Smithsonian Institution, Jet Propulsion Laboratory, and Max Planck Society facilities. Early comparisons invoked trapped atmospheric signatures analogous to measurements from the Viking program landers and later corroborated by instruments aboard Mars Global Surveyor and Mars Reconnaissance Orbiter. The SNC concept catalyzed collaborations among institutions like British Antarctic Survey, National Science Foundation, and the Lunar and Planetary Institute.
SNC specimens were subdivided into types reflecting lithology and metamorphic history: shergottites (mafic to ultramafic basalts), nakhlites (clinopyroxenites with alteration), and chassignites (olivine-rich dunites), terms echoed in classification schemes by the Meteoritical Society and codified in catalogs maintained by the Natural History Museum, London and the Smithsonian Institution National Museum of Natural History. Subsequent finds expanded taxonomic granularity with affinities noted in collections curated by the Field Museum of Natural History, Muséum national d'Histoire naturelle, and the Russian Academy of Sciences.
Hypotheses for provenance linked SNC meteorites to an ejection source on Mars via hypervelocity impacts, with candidate source regions proposed in connection to features mapped by Viking program, Mars Odyssey, and crater catalogs produced by teams at University of Arizona. Dynamical studies by groups at California Institute of Technology, Massachusetts Institute of Technology, and University of Colorado Boulder modeled transfer trajectories influenced by gravitational perturbations from Jupiter and resonances cataloged by the Minor Planet Center. Competing ideas explored origins from differentiated parent bodies in the early Solar System invoked by researchers affiliated with Carnegie Institution for Science and the Max Planck Institute for Solar System Research.
Petrographic analyses leveraged microprobe facilities at Harvard University, University of Oxford, and ETH Zurich to document mineral assemblages including olivine, pyroxene, and maskelynite, and shock textures consistent with impact processing. Major- and trace-element studies employed mass spectrometers at Woods Hole Oceanographic Institution, Ohio State University, and University of Tokyo, while oxygen isotope ratios were compared to standards developed at California Institute of Technology and Paris-Sorbonne University. Noble gas isotopes, including trapped atmospheric signatures, were analyzed by teams at NASA Johnson Space Center, University of Bern, and Scripps Institution of Oceanography, informing debates about volatile histories and crustal reservoirs analogous to those mapped by Mars Reconnaissance Orbiter.
Radiometric ages for SNC meteorites were determined using methods performed at Los Alamos National Laboratory, University of Minnesota, and McGill University, employing chronometers such as Rb–Sr, Sm–Nd, and Ar–Ar systems. Results revealed a range of crystallization ages and shock-reset ages that implicated both ancient differentiation and more recent impact events, with age constraints compared against crater-count chronologies developed by Brown University and thermal models advanced at the University of California, Berkeley. These dating efforts intersected with isotopic studies by researchers at Princeton University and University of Hawaiʻi at Mānoa.
Shergotty (1797), Nakhla (1911), and Chassigny (1815) entered catalogs maintained by institutions including the Natural History Museum, London and the Museo Nazionale dell'Antartide, inspiring targeted Antarctic searches by Japanese Antarctic Research Expedition and United States Antarctic Program teams. Later notable finds associated with the broader grouping include specimens curated by the Smithsonian Institution, the Field Museum, and private collections documented in monographs from the Meteoritical Society. Controversial and celebrated cases—such as alleged biological structures in certain specimens—provoked investigations involving the Royal Society, National Academy of Sciences, and international working groups convened by International Astronomical Union committees.
SNC meteorites profoundly influenced mission planning at NASA and ESA by providing ground-truth for in situ instruments on missions like Mars Science Laboratory and sample return architectures later proposed by Mars Sample Return campaigns. Interpretations informed models of magmatism, crustal evolution, and volatile exchange on Mars, and shaped comparative planetology frameworks advanced by scholars at California Institute of Technology, University of Chicago, and Massachusetts Institute of Technology. Ongoing studies at institutions such as Smithsonian Institution, University of Arizona, and Max Planck Institute for Chemistry continue to refine links between meteoritic records and orbital observations from platforms like Mars Reconnaissance Orbiter and MAVEN.
Category:Meteorites