Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites
Identifieur interne : 000061 ( France/Analysis ); précédent : 000060; suivant : 000062Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites
Auteurs : Jean-Pierre Lorand [France] ; Jean-Alix Barrat [France] ; Vincent Chevrier [États-Unis] ; Violaine Sautter [France] ; Sylvain Pont [France]Source :
- Meteoritics & Planetary Science [ 1086-9379 ] ; 2012-11.
Abstract
NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal‐saturated Fe‐Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni‐poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr‐bearing (up to 1 wt%), coexists with micrometer‐sized taenite/tetrataenite‐type native Ni‐Fe alloys (Ni/Fe = 1) and Fe‐Os‐Ir‐(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame‐like pentlandite (Fe/Fe + Ni = 0.5–0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni‐Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal‐deficient monoclinic‐type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the fO2 conditions inferred from chromites compositions and accepted for Chassignites (FMQ‐1 log unit). It is proposed that reduction in sulfides into base and precious metal alloys is operated via sulfur degassing, which is supported by the highly resorbed and denticulated shape of sulfide blebs and their spongy textures. Shock‐related S degassing may be responsible for considerable damages in magmatic sulfide structures and sulfide assemblages, with concomitant loss of magnetic properties as documented in some other Martian meteorites.
Url:
DOI: 10.1111/maps.12015
Affiliations:
- France, États-Unis
- Région Bretagne, Île-de-France
- Paris, Plouzané
- Université de Bretagne Occidentale
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These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni‐poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr‐bearing (up to 1 wt%), coexists with micrometer‐sized taenite/tetrataenite‐type native Ni‐Fe alloys (Ni/Fe = 1) and Fe‐Os‐Ir‐(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame‐like pentlandite (Fe/Fe + Ni = 0.5–0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni‐Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal‐deficient monoclinic‐type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the fO2 conditions inferred from chromites compositions and accepted for Chassignites (FMQ‐1 log unit). It is proposed that reduction in sulfides into base and precious metal alloys is operated via sulfur degassing, which is supported by the highly resorbed and denticulated shape of sulfide blebs and their spongy textures. Shock‐related S degassing may be responsible for considerable damages in magmatic sulfide structures and sulfide assemblages, with concomitant loss of magnetic properties as documented in some other Martian meteorites.</div></front></TEI><affiliations><list><country><li>France</li><li>États-Unis</li></country><region><li>Région Bretagne</li><li>Île-de-France</li></region><settlement><li>Paris</li><li>Plouzané</li></settlement><orgName><li>Université de Bretagne Occidentale</li></orgName></list><tree><country name="France"><noRegion><name sortKey="Lorand, Jean Ierre" sort="Lorand, Jean Ierre" uniqKey="Lorand J" first="Jean-Pierre" last="Lorand">Jean-Pierre Lorand</name></noRegion><name sortKey="Barrat, Jean Lix" sort="Barrat, Jean Lix" uniqKey="Barrat J" first="Jean-Alix" last="Barrat">Jean-Alix Barrat</name><name sortKey="Pont, Sylvain" sort="Pont, Sylvain" uniqKey="Pont S" first="Sylvain" last="Pont">Sylvain Pont</name><name sortKey="Sautter, Violaine" sort="Sautter, Violaine" uniqKey="Sautter V" first="Violaine" last="Sautter">Violaine Sautter</name></country><country name="États-Unis"><noRegion><name sortKey="Chevrier, Vincent" sort="Chevrier, Vincent" uniqKey="Chevrier V" first="Vincent" last="Chevrier">Vincent Chevrier</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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