Mesosiderites—I. Compositions of their metallic portions and possible relationship to other metal-rich meteorite groups

Wasson, J. T.; Schaudy, R.; Bild, R. W.; Chou, Chen‐Lin

doi:10.1016/0016-7037(74)90199-9

Cited by 48 publications

(24 citation statements)

References 28 publications

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“…Metal occurs as clasts, constituents of some lithic clasts, and as veins in silicate clasts and matrices. Composition of metallic portions is similar to IIIAB irons that are thought to have originated in the core of an asteroidal body (Powell 1969;Wasson et al 1974;Hassanzadeh et al 1990). …”

Section: Introductionmentioning

confidence: 89%

Petrology and geochemistry of a silicate clast from the Mount Padbury mesosiderite: Implications for metal-silicate mixing events of mesosiderite

Tamaki

Yamaguchi

Misawa

et al. 2006

Meteoritics &Amp; Planetary Science

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Abstract-Petrological and bulk geochemical studies were performed on a large silicate clast from the Mount Padbury mesosiderite. The silicate clast is composed mainly of pyroxene and plagioclase with minor amounts of ilmenite, spinel, and other accessory minerals, and it shows subophitic texture. Pyroxenes in the clast are similar to those in type 5 eucrites and could have experienced prolonged thermal metamorphism after rapid crystallization from a near-surface melt. Ilmenite and spinel vary chemically, indicating growth under disequilibrium conditions. The clast seems to have experienced an episode of rapid reheating and cooling, possibly as a result of metal-silicate mixing. Abundances of siderophile elements are obviously higher than in eucrites, although the clast is also extremely depleted in highly siderophile elements. The fractionated pattern can be explained by injection of FeFeS melts generated by partial melting of metallic portions during metal-silicate mixing.The silicate clast had a complex petrogenesis that could have included: 1) rapid crystallization from magma in a lava flow or a shallow intrusion; 2) prolonged thermal metamorphism to equilibrate the mineral compositions of pyroxene and plagioclase after primary crystallization; 3) metal-silicate mixing probably caused by the impact of solid metal bodies on the surface of the mesosiderite parent body; and 4) partial melting of metal and sulfide portions (and silicate in some cases) caused by the collisional heating, which produced Fe-FeS melts with highly fractionated siderophile elements that were injected into silicate portions along cracks and fractures.

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Section: Introductionmentioning

confidence: 89%

Petrology and geochemistry of a silicate clast from the Mount Padbury mesosiderite: Implications for metal-silicate mixing events of mesosiderite

Tamaki

Yamaguchi

Misawa

et al. 2006

Meteoritics &Amp; Planetary Science

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“…Wasson et al (1974) noticed that concentrations of Ga and Ge are lower in the metal of type I mesosiderites than in metal of other types. The Ga concentration in the Dong Ujimqin Qi matrix metal is 7.66 ppm, among the lowest found for mesosiderites.…”

Section: Subclassification Of Dong Ujimqin Qi Mesosideritementioning

confidence: 99%

“…Two kinds of metal are present in mesosiderites: large metal nodules and fine-grained matrix metal. The metal nodules range in shape from subangular to well rounded (Hassanzadeh et al 1990); the matrix metal is mostly in the form of millimeter or submillimeter grains, which are interstitial to silicates (Powell et al 1971;Wasson et al 1974). The silicate is characterized by diverse textures: large pyroxenitic, basaltic, gabbroic, and dunite clasts embedded in a fine-grained silicate matrix (Rubin and Jerde 1988;Mittlefehldt 1990).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry and origin of metal, olivine clasts, and matrix in the Dong Ujimqin Qi mesosiderite

Kong

et al. 2008

Meteorit & Planetary Scien

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Abstract-The Dong Ujimqin Qi mesosiderite is the first recorded fall of a stony-iron meteorite in China. According to silicate textures and metal composition, this meteorite is classified as a member of subgroup IB. Instrumental neutron activation analyses (INAA) of metals show that the matrix metal has lower concentrations of Os, Ir, Re, and Pt, but higher concentrations of Ni and Au than the 7.5 cm metal nodule present in the meteorite. We attribute these compositional differences to fractional crystallization of molten metal. Studies of olivine clasts show that FeO contents are uniform in individual olivine crystals but are variable for different olivine clasts. Although concentrations of rare earth elements (REEs) change within olivine clasts, they all exhibit a vee-shaped pattern relative to CI chondrites. The relatively high concentrations of REEs in olivine and the shape of REE patterns require a liquid high in REEs and especially in light REEs. As such a liquid was absent from the region where basaltic and gabbroic clasts formed, mesosiderite olivine must have formed in a part of the differentiated asteroid that is different from the location where other mesosiderite silicate clasts formed.

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“…Mason and Jarosewich (1973) studied three mesosiderites and argued for a possible common origin of all mesosiderites. Wasson et al (1974) reported analyses of the metal portions of mesosiderites that tended to support Powell's classification and noted similarities with the metallic portion of Weekeroo-type irons (group lIE), suggestinga formation in the same region of the solar system. Despite these pioneering efforts, the origin and evolution of the mesosiderites and their relationship to other meteorite groups are still poorly understood.…”

Section: Introductionmentioning

confidence: 97%

“…As a first contribution to such a study, I have analyzed the pyroxenes in the Patwar meteorite with an electron microprobe. Patwar was chosen because it has previously been studied by both Powell (1971) and Wasson et al (1974), and because Mason and Jarosewich (1973) it had a large range in pyroxene composition, suggesting that it represents a sample in which magmatic compositions are most likely preserved and have been least affected by subsequent metamorphism.…”

Section: Introductionmentioning

confidence: 99%

Pyroxenes in the Patwar Mesosiderite‡

Weigand

1975

Meteoritics

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Mesosiderites—I. Compositions of their metallic portions and possible relationship to other metal-rich meteorite groups

Cited by 48 publications

References 28 publications

Petrology and geochemistry of a silicate clast from the Mount Padbury mesosiderite: Implications for metal-silicate mixing events of mesosiderite

Petrology and geochemistry of a silicate clast from the Mount Padbury mesosiderite: Implications for metal-silicate mixing events of mesosiderite

Geochemistry and origin of metal, olivine clasts, and matrix in the Dong Ujimqin Qi mesosiderite

Pyroxenes in the Patwar Mesosiderite‡

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