The Tissint Martian meteorite as evidence for the largest impact excavation

Baziotis, Ioannis; Liu, Yang; DeCarli, Paul S.; Melosh, H. J.; McSween, H. Y.; Bodnar, Robert J.; Taylor, L. A.

doi:10.1038/ncomms2414

Cited by 101 publications

(99 citation statements)

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“…Tissint is the fifth fall of a Martian meteorite and the first since Zagami in 1962. It is a depleted olivine-phyric shergottite with abundant shock features and has been the subject of intensive study since its fall, largely because it is so fresh (e.g., Steele et al, 2012;Baziotis et al, 2013;Walton et al, 2014 and references therein).…”

Section: Sample Information For Type Materials and Other Occurrencesmentioning

confidence: 99%

“…Ringwoodite is commonly observed in highly shocked meteorites from the Moon, Mars, and H and L ordinary chondrites (e.g., Binns et al, 1969;Kimura et al, 2003;Xie and Sharp, 2007;Zhang et al, 2011;Baziotis et al, 2013;Walton et al, 2014). In some L5-L6 ordinary chondrites, Mg#s are low enough so that the phase being described is actually an ahrensite [i.e., Mg# < 50; Xie et al, 2002;Feng et al, 2011], with the mole % of Fe 2 SiO 4 as high as 98% in the L6 chondrite Umbarger (Xie et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…All Martian meteorites, previously launched from the surface of Mars, exhibit evidence for significant shock effects; shergottites and chassignites have been especially heavily shocked and contain a broad range of high-pressure phases (e.g., Fritz and Greshake, 2009;Baziotis et al, 2013;El Goresy et al, 2013b;Walton et al, 2014). Thus, any interpretation of earlier conditions, resulting from processes on Mars that can be drawn from SNC meteorites, must take into account possible modifications through the launching-shock event.…”

Section: Introductionmentioning

confidence: 99%

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Ahrensite, γ-Fe2SiO4, a new shock-metamorphic mineral from the Tissint meteorite: Implications for the Tissint shock event on Mars

Tschauner

Beckett

et al. 2016

Geochimica et Cosmochimica Acta

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. where it forms through the transformation of the fayalite-rich rims of olivine megacrysts or Fe-rich microphenocrysts in contact with shock melt pockets. We report the first comprehensive set of crystallographic, spectroscopic, and quantitative chemical analysis of type ahrensite, and show that concentrations of ferric iron and inversion in the type material of this newly approved mineral are negligible. We also report the occurrence of nanocrystalline ringwoodite in strained olivine and establish correlations between grain size and distance from melt pockets. The ahrensite and ringwoodite crystals show no preferred orientation, consistent with random 2 nucleation and incoherent growth within a highly strained matrix of olivine. Grain sizes of ahrensite immediately adjacent to melt pockets are consistent with growth during a shock of moderate duration (1-10 ms).

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Section: Sample Information For Type Materials and Other Occurrencesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ahrensite, γ-Fe2SiO4, a new shock-metamorphic mineral from the Tissint meteorite: Implications for the Tissint shock event on Mars

Tschauner

Beckett

et al. 2016

Geochimica et Cosmochimica Acta

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“…T he existence of a high-pressure polymorph in a meteorite suggests that its parent body has gone through a dynamic event [1][2][3][4][5][6][7] . Several previous studies have proposed that few high-pressure polymorphs are contained in lunar meteorites 8,9 although many craters and thick regoliths of the moon imply that it has experienced heavy meteorite bombardments.…”

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confidence: 99%

Discovery of seifertite in a shocked lunar meteorite

et al. 2013

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Many craters and thick regoliths of the moon imply that it has experienced heavy meteorite bombardments. Although the existence of a high-pressure polymorph is a stark evidence for a dynamic event, few high-pressure polymorphs are found in a lunar sample. a-PbO 2 -type silica (seifertite) is an ultrahigh-pressure polymorph of silica, and is found only in a heavily shocked Martian meteorite. Here we show evidence for seifertite in a shocked lunar meteorite, Northwest Africa 4734. Cristobalite transforms to seifertite by high-pressure and -temperature condition induced by a dynamic event. Considering radio-isotopic ages determined previously, the dynamic event formed seifertite on the moon, accompanying the complete resetting of radio-isotopic ages, is B2.7 Ga ago. Our finding allows us to infer that such intense planetary collisions occurred on the moon until at least B2.7 Ga ago.

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“…In order to confirm their hypothesis, more investigation should be conducted on the meteoritic Rw, which represents the best natural specimen for studying high-P structural features, including the Mg-Si order-disorder state, due to its having much larger quench rates. Rw of various colors has been documented in many meteorites, including L ordinary chondrites [108][109][110][111][112], LL ordinary chondrites [14,26], and Martian meteorites like the shergottites [32,34,37]. If the relationship among the color, composition, inverse magnitude, P and T can be adequately quantified, a fine scale for accurately estimating the shock P-T conditions may be derived, which may serve well the theoretical evolution models of the early solar system.…”

Section: Discussionmentioning

confidence: 99%

Si-Disordering in MgAl2O4-Spinel under High P-T Conditions, with Implications for Si-Mg Disorder in Mg2SiO4-Ringwoodite

Liu

Bao

et al. 2018

Minerals

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A series of Si-bearing MgAl 2 O 4 -spinels were synthesized at 1500-1650 • C and 3-6 GPa. These spinels had SiO 2 contents of up to~1.03 wt % and showed a substitution mechanism of Si 4+ + Mg 2+ = 2Al 3+ . Unpolarized Raman spectra were collected from polished single grains, and displayed a set of well-defined Raman peaks at~610, 823, 856 and 968 cm −1 that had not been observed before. Aided by the Raman features of natural Si-free MgAl 2 O 4 -spinel, synthetic Si-free MgAl 2 O 4 -spinel, natural low quartz, synthetic coesite, synthetic stishovite and synthetic forsterite, we infer that these Raman peaks should belong to the SiO 4 groups. The relations between the Raman intensities and SiO 2 contents of the Si-bearing MgAl 2 O 4 -spinels suggest that under some P-T conditions, some Si must adopt the M-site. Unlike the SiO 4 groups with very intense Raman signals, the SiO 6 groups are largely Raman-inactive. We further found that the Si cations primarily appear on the T-site at P-T conditions ≤~3-4 GPa and 1500 • C, but attain a random distribution between the T-site and M-site at P-T conditions ≥~5-6 GPa and 1630-1650 • C. This Si-disordering process observed for the Si-bearing MgAl 2 O 4 -spinels suggests that similar Si-disordering might happen to the (Mg,Fe) 2 SiO 4 -spinels (ringwoodite), the major phase in the lower part of the mantle transition zone of the Earth and the benchmark mineral for the very strong shock stage experienced by extraterrestrial materials. The likely consequences have been explored.

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The Tissint Martian meteorite as evidence for the largest impact excavation

Cited by 101 publications

References 43 publications

Ahrensite, γ-Fe2SiO4, a new shock-metamorphic mineral from the Tissint meteorite: Implications for the Tissint shock event on Mars

Ahrensite, γ-Fe2SiO4, a new shock-metamorphic mineral from the Tissint meteorite: Implications for the Tissint shock event on Mars

Discovery of seifertite in a shocked lunar meteorite

Si-Disordering in MgAl2O4-Spinel under High P-T Conditions, with Implications for Si-Mg Disorder in Mg2SiO4-Ringwoodite

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