The Landes Meteorite

Bunch, T. E.; Keil, K.; Huss, Glenn I.

doi:10.1111/j.1945-5100.1972.tb00421.x

Cited by 36 publications

(18 citation statements)

References 3 publications

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“…d Chromite adjacent to shock veins in Suizhou chondrite (Chen et al 2003). e Chromite within kamacite of Landes iron meteorite (Bunch et al 1972). f Chromite within silicate inclusions of Landes iron meteorite (Bunch et al 1972).…”

Section: Resultsmentioning

confidence: 99%

“…e Chromite within kamacite of Landes iron meteorite (Bunch et al 1972). f Chromite within silicate inclusions of Landes iron meteorite (Bunch et al 1972). g Chromite within metal phase of Little Minnie Creek chondrite (Bevan et al 2001).…”

Section: Resultsmentioning

confidence: 99%

“…The Sychevka chromite contains only minor amounts of vanadium (0.09 wt% V 2 O 3 ; Table 2) but displays appreciable amounts of zinc (0.77 wt% ZnO; Table 1) in contrast with the Saint Aubin chromite. Vanadium is not routinely analyzed by microprobe analysis of meteorites but comparable vanadium contents between 0.76 and 0.97 wt% were observed in chromites of the Landes octahedrite (Bunch et al 1972), the chondrites of Suizhou (Chen et al 2003), and Little Minnie Creek (Bevan et al 2001) as shown in Table 1. These chromites do not display endmember composition but contain remarkable amounts of MgO, MnO, ZnO, Al 2 O 3 , and TiO 2 , as reported for the chromites of the Bocaiuva and Miles octahedrites ( Table 1).…”

Section: Discussionmentioning

confidence: 97%

“…In chondrites, they are usually found together with the metal phase. Chromites with grain sizes of 10-100 microns rarely exceed the dimension of 0.8 mm as in the Landes octahedrite (Bunch et al 1972). The grains are usually rounded, and euhedral octahedral crystals scarcely show tetrahedral or rhombic shapes in cross-sections.…”

Section: Discussionmentioning

confidence: 99%

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Unusual large chromite crystals in the Saint Aubin iron meteorite

Fehr

Carion

2004

Meteorit & Planetary Scien

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Abstract-In the Saint Aubin octahedrite, chromite crystals of up to 3 cm occur enclosed in the metal phase. They are twinned along [111] according to the spinel law and display pseudohexagonal shapes in cross-sections. The crystals are homogeneous and exhibit compositions close to pure chromite endmember. Vanadium is the only additional element observed in appreciable amounts of up to 0.73 wt%. Chromite in the Saint Aubin meteorite crystallized from liquids with very low amounts of Cr and O close to the Fe-FeS join as indicated by its composition and phase relations. The growth of large chromite crystals implies stable supersaturated conditions for a long period in the meteorite parent body of Saint Aubin.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Unusual large chromite crystals in the Saint Aubin iron meteorite

Fehr

Carion

2004

Meteorit & Planetary Scien

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“…The plots also show chromites low in Zn and Mn and associated with zincian chromites for altered/metamorphosed rocks. Data sources are as follows: Meyer and Boyd (1972), Stachel et al (2000), Taylor et al (2003), and Donnelly et al (2007) for diamond inclusions; Bunch et al (1970Bunch et al ( , 1972, Bunch and Keil (1971), Desnoyers et al (1985), Krot et al (1992), Ikeda et al (1997), Chikami et al (1999), Wasson et al (1999), and Fehr and Carion (2004) for meteorites; and Thayer et al (1964), Wylie et al (1987), Challis et al (1995), Weiser and Hirdes (1997), Gahlan and Arai (2007), and Johan and Ohnenstetter (2010) for low -temperature altered/metamorphosed peridotites and related rocks. Zincian chromite of possible deep recycling origin Relationships between Cr/(Cr + Al) atomic ratio and Mg#, and Cr -Al -Fe 3+ atomic ratios of zincian chromites and related spinels.…”

Section: Meteoritesmentioning

confidence: 99%

Zincian chromite inclusions in diamonds: Possibility of deep recycling origin

Arai

Ishimaru

2011

Journal of Mineralogical and Petrological Sciences

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It was reported by Meyer and Boyd (1972) that zincian chromite, having 2 wt% to 3 wt% ZnO and high (>0.9) Cr# (= Cr/(Cr + Al) atomic ratio), appears as inclusions in diamonds obtained from kimberlite. Zincian chromite is characterized by a low (<0.03) Mg# [= Mg/(Mg + ferrous Fe + Zn + Mn + Ni + Co) atomic ratio] and an appreciable amount of MnO (0.4 -0.5 wt%). The chemistry of zincian chromite is very different from commonly found chromite inclusions (magnesiochromite) in diamonds, which contain low amounts of ZnO (<0.1 wt%) and MnO (<0.1 wt%). Zincian and manganoan chromites are also commonly found in meteorites and in altered/ metamorphosed peridotites and related rocks. The chromites found in meteorites mostly have an intermediate Mg# (0.2 -0.5) and a high Cr# (mostly >0.8); moreover, the major -element chemistry of these chromites is similar to that of the magnesiochromite inclusions in diamonds. Spinels obtained from altered rocks show a chemical range that comprises the zincian chromite inclusions found in diamonds. The origin of these inclusions possibly lies in deep recycling. They were initially formed at the Earth's surface in altered/metamorphosed peridotites; they then sank deep down into the mantle and were entrained to the surface again by kimberlite magmatism.

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Electron and optical microscopy studies of extraterrestrial minerals in NWA4047 meteorite

Polański

Krystek

2008

Cryst. Res. Technol.

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Analytical electron microscopy and optical microscopy were used to determine the elemental and mineral composition of NWA4047 meteorite. The meteorite was found in 2005 in Morocco, and in 2006 was preliminary classified as H4-5 ordinary chondrite. The main crystalline meteorite minerals: olivines, pyroxenes, kamacite and taenite, feldspars, as well as troilite identified in our sample represent extraterrestrial minerals typical of the ordinary chondrite of high iron content. Low-Ca orthopyroxene called bronzite has been revealed. Single enstatite and clinopyroxene crystals have also been identified. Olivines in the meteorite contain 18 mol % of fayalite. The meteorite is a monomict breccia, in which fragments of petrographic types 4, 5, and 6 are present, with the groundmass being type 4. Some of clasts contain large grains of feldspars and high content of feldspars, which is typical of petrologic type 6. Chemical and mineral composition, petrologic types of chondrules, their abundance and sizes, the presence of troilite-kamacite veins, and nonoxidised iron phases prove that the chondrite belong to H group, i.e. to the olivine-bronzite group. Our results show that the NWA4047 meteorite is H4-6 ordinary chondrite. The weathering grade of the meteorite W0/1 is the same as previously established, but the shock grade S3 seems to be higher in comparison with the previous classification.

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The Landes Meteorite

Cited by 36 publications

References 3 publications

Unusual large chromite crystals in the Saint Aubin iron meteorite

Unusual large chromite crystals in the Saint Aubin iron meteorite

Zincian chromite inclusions in diamonds: Possibility of deep recycling origin

Electron and optical microscopy studies of extraterrestrial minerals in NWA4047 meteorite

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