Wikipedia

Martian meteorite

(Redirected fromShergottite)
For meteorites found on Mars, seeList of rocks on Mars.

AMartian meteoriteis a rock that formed onMars,was ejected from the planet by animpact event,and traversedinterplanetary spacebefore landing onEarthas ameteorite.As of September 2020,277 meteorites had been classified as Martian, less than half a percent of the 72,000 meteorites that have been classified.[1]The largest complete, uncut Martian meteorite, Taoudenni 002,[3]was recovered in Mali in early 2021. It weighs 14.5 kilograms (32 pounds) and is on display at theMaine Mineral and Gem Museum.

Martian meteorite (SNC meteorites)
—Clan—
Martian meteoriteEETA79001,shergottite
TypeAchondrite
Subgroups
Parent bodyMars
Total known specimens277 as of 15 September 2020[1]
Martian meteoriteNWA 7034,nicknamed "Black Beauty," weighs approximately 320 g (11 oz).[2]

There are threegroupsof Martian meteorite:shergottites,nakhlitesandchassignites,collectively known asSNC meteorites.Several other Martian meteorites areungrouped.These meteorites are interpreted as Martian because they haveelementalandisotopiccompositions that are similar torocksandatmospheric gases on Mars,which have been measured byorbiting spacecraft,surface landersandrovers.[4][5]The term does not include meteorites found on Mars, such asHeat Shield Rock.

History

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By the early 1980s, it was obvious that the SNC group of meteorites (Shergottites, Nakhlites, and Chassignites) were significantly different from most other meteorite types. Among these differences were younger formation ages, a different oxygen isotopic composition, the presence of aqueous weathering products, and some similarity in chemical composition to analyses of the Martian surface rocks in 1976 by theViking landers.Several scientists suggested these characteristics implied the origin of SNC meteorites from a relatively large parent body, possibly Mars.[6][7]

Then in 1983, various trapped gases were reported in impact-formed glass of the EET79001 shergottite, gases which closely resembled those in the Martian atmosphere as analyzed by Viking.[8]These trapped gases provided direct evidence for a Martian origin. In 2000, an article by Treiman, Gleason and Bogard gave a survey of all the arguments used to conclude the SNC meteorites (of which 14 had been found at the time) were from Mars. They wrote, "There seems little likelihood that the SNCs are not from Mars. If they were from another planetary body, it would have to be substantially identical to Mars as it now is understood."[4]

Subdivision

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The Martian meteorites are divided into three groups (orange) and two grouplets (yellow). SHE =Shergottite,NAK =Nakhlite,CHA =Chassignite,OPX = Orthopyroxenite (ALH 84001), BBR = Basaltic Breccia (NWA 7034).

As of April 25, 2018, 192 of the 207 Martian meteorites are divided into three rare groups ofachondritic(stony)meteorites:shergottites(169),nakhlites(20),chassignites(3), and ones otherwise (15) (containing the orthopyroxenite (OPX) Allan Hills 84001, as well as 10 basaltic breccia meteorites).[1]Consequently, Martian meteorites as a whole are sometimes referred to as theSNC group(pronounced/snɪk/).[9]They haveisotoperatios that are consistent with each other and inconsistent with a terrestrial origin. The names derive from the location of where the first meteorite of their type was discovered.

Shergottites

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Roughly three-quarters of all Martian meteorites can be classified as shergottites. They are named after theShergotty meteorite,which fell atSherghati,Indiain 1865.[10]Shergottites areigneous rocksofmafictoultramaficlithology.They fall into three main groups, thebasaltic,olivine-phyric (such as theTissintgroup found in Morocco in 2011[11][12]) andLherzoliticshergottites, based on their crystal size and mineral content. They can be categorised alternatively into three or four groups based on theirrare-earth elementcontent.[13]These two classification systems do not line up with each other, hinting at complex relationships between the various source rocks and magmas from which the shergottites formed.

NWA 6963,[14]a shergottite found in Morocco, September 2011.

The shergottites appear to have crystallised as recently as 180 million years ago,[15]which is a surprisingly young age considering how ancient the majority of the surface of Mars appears to be, and the small size of Mars itself. Because of this, some have advocated the idea that the shergottites are much older than this.[16]This "Shergottite Age Paradox" remains unsolved and is still an area of active research and debate.

It has been suggested the 3-million-year-old craterMojave,58.5 km in diameter, was a potential source of these meteorites.[17]A paper published in 2021, however, disputes this, proposing instead the 28 km craterTooting,or possibly the crater09-000015as the crater source of the depleted olivine-phyric shergottites ejected 1.1 Ma ago.[18][19]

Nakhlites

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Nakhla meteorite's two sides and its inner surfaces after breaking it
Main article:Nakhlite

Nakhlites are named after the first of them, theNakhla meteorite,which fell inEl-Nakhla,Alexandria,Egyptin 1911 and had an estimated weight of 10kg.

Nakhlites areigneous rocksthat are rich inaugiteand were formed frombasalticmagmafrom at least four eruptions, spanning around 90 million years, from 1416 ± 7 to 1322 ± 10 million years ago.[20]They containaugiteandolivinecrystals.Their crystallization ages, compared to a crater count chronology of different regions on Mars, suggest the nakhlites formed on the large volcanic construct of eitherTharsis,Elysium,orSyrtis Major Planum.[21]

It has been shown that the nakhlites were suffused with liquid water around 620 million years ago and that they were ejected from Mars around 10.75 million years ago by an asteroid impact. They fell to Earth within the last 10,000 years.[21]

Chassignites

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The first chassignite, theChassigny meteorite,fell atChassigny, Haute-Marne,Francein 1815. There has been only one other chassignite recovered, named Northwest Africa (NWA) 2737. NWA 2737 was found inMoroccoorWestern Saharain August 2000 by meteorite hunters Bruno Fectay and Carine Bidaut, who gave it the temporary name "Diderot." It was shown by Becket al.[22]that its "mineralogy,major and trace element chemistry as well asoxygen isotopesrevealed an unambiguous Martian origin and strong affinities with Chassigny. "

Ungrouped meteorites

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Allan Hills 84001(ALH 84001)

Among these, the famous specimenAllan Hills 84001has a different rock type from other Martian meteorites: it is anorthopyroxenite(an igneous rock dominantly composed oforthopyroxene). For this reason it is classified within its own group, the "OPX Martian meteorites". This meteorite received much attention after an electron microscope revealed structures that were considered to be thefossilizedremains ofbacteria-likelifeforms.As of 2005,scientific consensus was that themicrofossilswere not indicative of Martian life, but of contamination by earthlybiofilms.ALH 84001 is as old as the basaltic and intermediate shergottite groups – i.e., 4.1 billion years old.[citation needed]

In March 2004 it was suggested that the uniqueKaidun meteorite,which landed inYemenon December 3, 1980,[23]may have originated on the Martian moon ofPhobos.[24]Because Phobos has similarities toC-type asteroidsand because the Kaidun meteorite is acarbonaceous chondrite,Kaidun is not a Martian meteorite in the strict sense. However, it may contain small fragments of material from the Martian surface.

The Martian meteoriteNWA 7034(nicknamed "Black Beauty" ), found in theSahara desertduring 2011, has ten times thewater contentof other Mars meteorites found on Earth.[2]The meteorite contains components as old as 4.42 ± 0.07 Ga (billion years),[25]and was heated during theAmazonian geologic periodon Mars.[26]

A meteorite that fell in 1986 in Dayanpo, China contained a magnesium silicate mineral called "Elgoresyte",a mineral not found on Earth.[27]

Origin

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The majority of SNC meteorites are quite young compared to most other meteorites and seem to imply thatvolcanicactivity was present on Mars only a few hundred million years ago. The young formation ages of Martian meteorites was one of the early recognized characteristics that suggested their origin from a planetary body such as Mars. Among Martian meteorites, only ALH 84001 and NWA 7034 have radiometric ages older than about 1400 Ma (Ma = million years). All nakhlites, as well as Chassigny and NWA 2737, give similar if not identical formation ages around 1300 Ma, as determined by various radiometric dating techniques.[15][28]Formation ages determined for many shergottites are variable and much younger, mostly ~150–575 Ma.[15][29][30][31]

The chronological history of shergottites is not totally understood, and a few scientists have suggested that some may actually have formed prior to the times given by their radiometric ages,[32]a suggestion not accepted by most scientists. Formation ages of SNC meteorites are often linked to their cosmic-ray exposure (CRE) ages, as measured from the nuclear products of interactions of the meteorite in space with energeticcosmic rayparticles. Thus, all measured nakhlites give essentially identical CRE ages of approximately 11 Ma, which when combined with their possible identical formation ages indicates ejection of nakhlites into space from a single location on Mars by a single impact event.[15]Some of the shergottites also seem to form distinct groups according to their CRE ages and formation ages, again indicating ejection of several different shergottites from Mars by a single impact. However, CRE ages of shergottites vary considerably (~0.5–19 Ma),[15]and several impact events are required to eject all the known shergottites. It had been asserted that there are no large young craters on Mars that are candidates as sources for the Martian meteorites, but subsequent studies claimed to have a likely source forALH 84001,[33]and a possible source for other shergottites.[34]

In a 2014 paper, several researchers claimed that all shergottites meteorites come from theMojave Crateron Mars.[17]

Age estimates based on cosmic ray exposure

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A Martian meteorite crafted into a small pendant and suspended from a gold necklace.

The amount of time spent in transit from Mars to Earth can be estimated by measurements of the effect of cosmic radiation on the meteorites, particularly on isotope ratios ofnoble gases.The meteorites cluster in families that seem to correspond to distinct impact events on Mars. It is thought that the meteorites all originate in relatively few impacts every few million years on Mars. The impactors would be kilometers in diameter and the craters they form on Mars tens of kilometers in diameter. Models of impacts on Mars are consistent with these findings.[35]

Ages since impact determined so far include[36][37]

Type Age (mya)
Dhofar 019, olivine-phyric shergottite 19.8 ± 2.3[35]
ALH 84001, orthopyroxenite 15.0 ± 0.8[35]
Dunite (Chassigny) 11.1 ± 1.6[35]
Six nakhlites 10.8 ± 0.8[20][35]
Lherzolites 3.8–4.7[35]
Six basaltic shergottites 2.4–3.0[35]
Five olivine-phyric shergottites 1.2 ± 0.1[35]
EET 79001 0.73 ± 0.15[35]

Possible evidence of life

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Several Martian meteorites have been found to contain what some think is evidence for fossilized Martian life forms. The most significant of these is a meteorite found in theAllan HillsofAntarctica(ALH 84001). Ejection from Mars seems to have taken place about 16 million years ago. Arrival on Earth was about 13 000 years ago. Cracks in the rock appear to have filled with carbonate materials (implying groundwater was present) between 4 and 3.6 billion-years-ago. Evidence ofpolycyclic aromatic hydrocarbons(PAHs) have been identified with the levels increasing away from the surface. Other Antarctic meteorites do not contain PAHs. Earthly contamination should presumably be highest at the surface. Several minerals in the crack fill are deposited in phases, specifically,irondeposited asmagnetite,that are claimed to be typical of biodepositation on Earth. There are also small ovoid and tubular structures that might benanobacteriafossilsin carbonate material in crack fills (investigators McKay, Gibson, Thomas-Keprta, Zare).[38]MicropaleontologistSchopf, who described several important terrestrial bacterial assemblages, examined ALH 84001 and opined that the structures are too small to be Earthly bacteria and don't look especially like lifeforms to him. The size of the objects is consistent with Earthly "nanobacteria",but the existence of nanobacteria itself has been largely discredited.[39][40]

Many studies disputed the validity of the fossils.[41][42]For example, it was found that most of the organic matter in the meteorite was of terrestrial origin.[43]But, a recent study suggests thatmagnetitein the meteorite could have been produced by Martian microbes. The study, published in the journal of the Geochemical and Meteoritic Society, used more advanced high resolution electron microscopy than was possible in 1996.[44]A serious difficulty with the claims for a biogenic origin of the magnetites is that the majority of them exhibit topotactic crystallographic relationships with the host carbonates (i.e., there are 3D orientation relationships between the magnetite and carbonate lattices), which is strongly indicative that the magnetites have grown in-situ by a physico-chemical mechanism.[45]

While water is no indication of life, many of the meteorites found on Earth have shown water, including NWA 7034 which formed during theAmazonian periodof Martian geological history.[46]Other signs of surface liquidwater on Mars(such asrecurring slope lineae[47]) are a topic of debate among planetary scientists, but generally consistent with the earlier evidence provided by Martian meteorites. Any liquid water present is likely too minimal to support life.

See also

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References

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  1. ^abc"Search results for 'Martian meteorites'".Meteoritical Bulletin.Meteoritical Society.Retrieved27 April2020.
  2. ^abStaff (January 3, 2013)."Researchers Identify Water Rich Meteorite Linked To Mars Crust".NASA.Archived fromthe originalon May 29, 2018.RetrievedJanuary 3,2013.
  3. ^Baker, Harry (2021-09-02)."World's largest Martian meteorite goes on display".Lives Science.Retrieved2021-12-15.
  4. ^abTreiman, A.H.; et al. (October 2000). "The SNC meteorites are from Mars".Planetary and Space Science.48(12–14): 1213–1230.Bibcode:2000P&SS...48.1213T.doi:10.1016/S0032-0633(00)00105-7.
  5. ^Webster, Guy (October 17, 2013)."NASA Rover Confirms Mars Origin of Some Meteorites".NASA.RetrievedOctober 29,2013.
  6. ^Smith, M.R.; Laul, J. C.; Ma, M. S.; Huston, T.; Verkouteren, R. M.; Lipschutz, M. E.; Schmitt, R. A. (February 15, 1984). "Petrogenesis of the SNC (Shergottites, Nakhlites, Chassignites) Meteorites: Implications for Their Origin From a Large Dynamic Planet, Possibly Mars".Journal of Geophysical Research.89(S02): B612–B630.Bibcode:1984LPSC...14..612S.doi:10.1029/JB089iS02p0B612.
  7. ^Allan H. Treiman; Michael J. Drake; Marie-Josee Janssens; Rainer Wolf; Mitsuru Ebihara (January 1986). "Core formation in the Earth and Shergottite Parent Body (SPB):Chemical evidence from basalts".Geochimica et Cosmochimica Acta.50(6): 1071–1091.Bibcode:1986GeCoA..50.1071T.doi:10.1016/0016-7037(86)90389-3.
  8. ^Bogard, D. D.; Johnson, P. (1983). "Martian gases in an Antarctic meteorite".Science.221(4611): 651–654.Bibcode:1983Sci...221..651B.doi:10.1126/science.221.4611.651.PMID17787734.S2CID32043880.
  9. ^Murdin, P (January 2001). "SNC Meteorite".Encyclopedia of Astronomy & Astrophysics.CRC Press.ISBN9781000523034.The letters SNC (pronounced `snick') stand for the three main classes: shergottites, nakhlites and chassignites.
  10. ^Shergotty Meteorite - JPL, NASA
  11. ^Choi, Charles Q. (11 October 2012)."Meteorite's Black Glass May Reveal Secrets of Mars".Space.
  12. ^Morin, Monte (October 12, 2012)."An unusually pristine piece of Mars".Los Angeles Times.
  13. ^Bridges, J.C.; Warren, P.H. (2006)."The SNC meteorites: basaltic igneous processes on Mars"(PDF).Journal of the Geological Society.163(2). Geological Society of London: 229–251.Bibcode:2006JGSoc.163..229B.doi:10.1144/0016-764904-501.ISSN0016-7649.S2CID6815557.
  14. ^"Northwest Africa 6963 (NWA 6963)".
  15. ^abcdeNyquist, L.E.; et al. (2001). "Ages and geologic histories of martian meteorites".Space Science Reviews.96:105–164.Bibcode:2001SSRv...96..105N.CiteSeerX10.1.1.117.1954.doi:10.1023/A:1011993105172.S2CID10850454.
  16. ^Bouvier, Audrey;Blichert-Toft, Janne;Albarède, Francis (2009). "Martian meteorite chronology and the evolution of the interior of Mars".Earth and Planetary Science Letters.280(1–4): 285–295.Bibcode:2009E&PSL.280..285B.doi:10.1016/j.epsl.2009.01.042.
  17. ^abWerner, S. C.;Ody, A.; Poulet, F. (2014-03-06)."The Source Crater of Martian Shergottite Meteorites".Science.343(6177): 1343–6.Bibcode:2014Sci...343.1343W.doi:10.1126/science.1247282.PMID24603150.S2CID206553043.
  18. ^Lagain, A.; Benedix, G. K.; Servis, K.; Baratoux, D.; Doucet, L. S.; Rajšic, A.; Devillepoix, H. a. R.; Bland, P. A.; Towner, M. C.; Sansom, E. K.; Miljković, K. (2021-11-03)."The Tharsis mantle source of depleted shergottites revealed by 90 million impact craters".Nature Communications.12(1): 6352.Bibcode:2021NatCo..12.6352L.doi:10.1038/s41467-021-26648-3.ISSN2041-1723.PMC8566585.PMID34732704.
  19. ^Gough, Evan (2021-11-08)."We Now Know Exactly Which Crater the Martian Meteorites Came From".Universe Today.Retrieved2021-11-15.
  20. ^abCohen, Benjamin E.; Mark, Darren F.; Cassata, William S.; Lee, Martin R.; Tomkinson, Tim; Smith, Caroline L. (2017-10-03)."Taking the pulse of Mars via dating of a plume-fed volcano".Nature Communications.8(1): 640.Bibcode:2017NatCo...8..640C.doi:10.1038/s41467-017-00513-8.ISSN2041-1723.PMC5626741.PMID28974682.
  21. ^abTreiman, A.H. (2005)."The nakhlite meteorites: Augite-rich igneous rocks from Mars"(PDF).Chemie der Erde.65(3): 203–270.Bibcode:2005ChEG...65..203T.doi:10.1016/j.chemer.2005.01.004.RetrievedJuly 30,2011.
  22. ^Beck, P.; et al. (March 14–18, 2005).The Diderot meteorite: The second chassignite(PDF).36th Annual Lunar and Planetary Science Conference. League City, Texas. abstract no.1326.RetrievedSeptember 8,2006.
  23. ^Meteoritical Bulletin Database
  24. ^Zolensky, M. and Ivanov A. (2003)."The Kaidun Microbreccia Meteorite: A Harvest from the Inner and Outer Asteroid Belt".Geochemistry.63(3): 185–246.Bibcode:2003ChEG...63..185Z.doi:10.1078/0009-2819-00038.
  25. ^Nyquist, Laurence E.; Shih, Chi-Yu; McCubbin, Francis M.; Santos, Alison R.; Shearer, Charles K.; Peng, Zhan X.; Burger, Paul V.; Agee, Carl B. (2016-02-17)."Rb-Sr and Sm-Nd isotopic and REE studies of igneous components in the bulk matrix domain of Martian breccia Northwest Africa 7034".Meteoritics & Planetary Science.51(3): 483–498.Bibcode:2016M&PS...51..483N.doi:10.1111/maps.12606.ISSN1086-9379.S2CID131565237.
  26. ^Cassata, William S.; Cohen, Benjamin E.; Mark, Darren F.; Trappitsch, Reto; Crow, Carolyn A.; Wimpenny, Joshua; Lee, Martin R.; Smith, Caroline L. (2018-05-01)."Chronology of martian breccia NWA 7034 and the formation of the martian crustal dichotomy".Science Advances.4(5): eaap8306.Bibcode:2018SciA....4.8306C.doi:10.1126/sciadv.aap8306.ISSN2375-2548.PMC5966191.PMID29806017.
  27. ^"A Mineral Unknown On Earth Could Be The Most Abundant Mineral On Mars".Geology In.2021-08-09.Retrieved2021-08-18.
  28. ^Park, J.; et al. (2009)."39Ar-40Ar ages of martian nakhlites".Geochim. Cosmochim. Acta.73(7): 2177–2189.Bibcode:2009GeCoA..73.2177P.doi:10.1016/j.gca.2008.12.027.
  29. ^Borg, L.E.; et al. (2005). "Constraints on the U-Pbisotopic systematics of Mars inferred from a combined U-Pb, Rb-Sr, and Sm-Nd isotopic study of the martian meteorite Zagami".Geochim. Cosmochim. Acta.69(24): 5819–5830.Bibcode:2005GeCoA..69.5819B.doi:10.1016/j.gca.2005.08.007.
  30. ^Shih, C-Y; et al. (2005). "Rb-Sr and Sm-Nd dating of olivine-phyric shergottite Yamato 980459: Petrogenesis of depleted shergottites".Antarctic Meteorite Research.18:46–65.Bibcode:2005AMR....18...46S.
  31. ^Nyquist, L.E.; et al. (2009)."Concordant Rb-Sr, Sm-Nd, and Ar-Ar ages for Northwest Africa 1460: A 446 Ma old basaltic shergottite related to" lherzolitic "shergottites".Geochim. Cosmochim. Acta.73(14): 4288–4309.Bibcode:2009GeCoA..73.4288N.doi:10.1016/j.gca.2009.04.008.
  32. ^Bouvier, A.; et al. (2008). "The case for old basaltic shergottites".Earth Planet. Sci. Lett.266(1–2): 105–124.Bibcode:2008E&PSL.266..105B.doi:10.1016/j.epsl.2007.11.006.
  33. ^Chandler, David L. (September 16, 2005)."Birthplace of famous Mars meteorite pinpointed".New Scientist.Archived fromthe originalon 2006-01-13.RetrievedSeptember 8,2006.
  34. ^McEwen, A.S.; Preblich, B; Turtle, E;Artemieva, N;Golombek, M; Hurst, M; Kirk, R; Burr, D; Christensen, P (2005)."The rayed crater Zunil and interpretations of small impact craters on Mars"(PDF).Icarus.176(2): 351–381.Bibcode:2005Icar..176..351M.doi:10.1016/j.icarus.2005.02.009.Retrieved2006-09-08..
  35. ^abcdefghiO. Eugster, G. F. Herzog, K. Marti, M. W. CaffeeIrradiation Records, Cosmic-Ray Exposure Ages, and Transfer Times of Meteorites, see section 4.5 Martian MeteoritesLPI, 2006
  36. ^L.E. NYQUIST, D.D. BOGARD1, C.-Y. SHIH, A. GRESHAKE, D. STÖFFLERAGES AND GEOLOGIC HISTORIES OF MARTIAN METEORITES2001
  37. ^Tony IrvingMartian Meteorites – has graphs of ejection ages– site maintained by Tony Irving for up to date information on Martian meteorites
  38. ^McKay, D.; Gibson Jr, EK; Thomas-Keprta, KL; Vali, H; Romanek, CS; Clemett, SJ; Chillier, XD; Maechling, CR; Zare, RN (1996). "Search for Past Life on Mars: Possible Relic Biogenic Activity in Martian Meteorite AL84001".Science.273(5277): 924–930.Bibcode:1996Sci...273..924M.doi:10.1126/science.273.5277.924.PMID8688069.S2CID40690489.
  39. ^Young, John D.; Martel, Jan (January 1, 2010)."The Truth about Nanobacteria".Scientific American.Retrieved2024-01-22.
  40. ^Schlieper, Georg; KrÜger, Thilo; Heiss, Alexander; Jahnen-Dechent, Willi (November 2011)."A red herring in vascular calcification: 'nanobacteria' are protein–mineral complexes involved in biomineralization".Nephrology Dialysis Transplantation.26(11): 3436–3439.doi:10.1093/ndt/gfr521.PMC4176054.PMID21965584.
  41. ^Powell and, Corey S.; Gibbs, W. Wayt (October 1996)."Bugs in the Data?".Scientific American.Vol. 275, no. 4. pp. 20–22.JSTOR24993389.
  42. ^David, Leonard (20 March 2002)."Controversy Continues: Mars Meteorite Clings to Life - Or Does It?]".Space.Archived fromthe originalon 2002-04-04.
  43. ^Bada, J. L.; Glavin, DP; McDonald, GD; Becker, L (1998). "A Search for Endogenous Amino Acids in Martian Meteorite ALH84001".Science.279(5349): 362–5.Bibcode:1998Sci...279..362B.doi:10.1126/science.279.5349.362.PMID9430583.S2CID32301715.
  44. ^Thomas-Keprta, K.L.; Clemett, S.J.; McKay, D.S.; Gibson, E.K.; Wentworth, S.J. (2009)."Origins of magnetite nanocrystals in Martian meteorite ALH84001".Geochimica et Cosmochimica Acta.73(21): 6631.Bibcode:2009GeCoA..73.6631T.doi:10.1016/j.gca.2009.05.064.
  45. ^Barber, D.J.; Scott, E.R.D. (2002)."Origin of supposedly biogenic magnetite in the Martian meteorite Allan Hills ALH84001".Proc. Natl. Acad. Sci. USA.99(10): 6556–61.Bibcode:2002PNAS...99.6556B.doi:10.1073/pnas.102045799.PMC124441.PMID12011420.
  46. ^Agee, Carl B.; Wilson, Nicole V.; McCubbin, Francis M.; Ziegler, Karen; Polyak, Victor J.; Sharp, Zachary D.; Asmerom, Yemane; Nunn, Morgan H.; Shaheen, Robina (2013-02-15)."Unique Meteorite from Early Amazonian Mars: Water-Rich Basaltic Breccia Northwest Africa 7034".Science.339(6121): 780–785.Bibcode:2013Sci...339..780A.doi:10.1126/science.1228858.ISSN0036-8075.PMID23287721.S2CID206544554.
  47. ^Ojha, Lujendra; Wilhelm, Mary Beth; Murchie, Scott L.; McEwen, Alfred S.; Wray, James J.; Hanley, Jennifer; Massé, Marion; Chojnacki, Matt (2015-11-01). "Spectral evidence for hydrated salts in recurring slope lineae on Mars".Nature Geoscience.8(11): 829–832.Bibcode:2015NatGe...8..829O.doi:10.1038/ngeo2546.ISSN1752-0894.
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