Fission track age and cooling rate of the Marjalahti pallasite

Pellas, P.; Perron, C.; Crozaz, G.; Perelygin, V.P.; Стеценко, С. Г.

doi:10.1016/0012-821x(83)90093-6

Cited by 15 publications

(11 citation statements)

References 25 publications

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“…The metallographic cooling rates are now more consistent with the lower limit of 5 K/Myr that Pellas et al (1983) inferred from Pu fission tracks in Marjalahti phosphate. The change in metallographic cooling rate is not surprising given the significant improvements, especially in understanding the effect of P on Widmanstätten growth and the improvement in the relevant diffusion coefficients and phase diagrams.…”

Section: Comparison With Published Pallasite Cooling Ratessupporting

confidence: 78%

Main-group pallasites: Thermal history, relationship to IIIAB irons, and origin

Yang

Goldstein

Scott

2010

Geochimica et Cosmochimica Acta

108

186

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Section: Comparison With Published Pallasite Cooling Ratessupporting

confidence: 78%

Main-group pallasites: Thermal history, relationship to IIIAB irons, and origin

Yang

Goldstein

Scott

2010

Geochimica et Cosmochimica Acta

108

186

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“…However, Narayan and Goldstein (1984) report that the published iron meteorite cooling rates are too low by two orders of magnitude. Presumably the pallasite cooling rates are similarly too low, in accord with the results of Pellas et al (1981) which suggest that the published pallasite cooling rates are too slow. In any event, based on its cooling rate, Zaisho will remain grouped with the bulk of pallasites.…”

supporting

confidence: 71%

Zaisho—a pallasite containing pyroxene and phosphoran olivine

Buseck

Clark

1984

Mineral. mag.

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ABSTRACT. The Zaisho meteorite, one of only four known pallasite falls, contains pyroxene, which is rare in pallasites, and it is only the fourth meteorite known to contain phosphoran olivine. Except for a recent report by Goodrich (1984) such olivine appears to be restricted to pallasites, and to those containing the rare Mg phosphate, farringtonite. It is unique among olivines in having P in tetrahedral sites and having vacancies, for charge balance, in octahedral sites. Zaisho also contains stanfieldite and a phosphate having a composition between that of stanfieldite and farringtonite. Its metallographic cooling rate is similar to that of many other pallasites, but its average olivine composition, Fals.3, places it in a small group with more Fe-rich olivines than most paUasites. THE Zaisho pallasite fell in 1898 (in Japan), but material was only recently made available for study. It is small, and the main mass is held privately. As a consequence, it was not included in several recent extended studies of the mineralogy and petrology of pallasites (Buseck and Goldstein, 1969;Buseck, 1977; Buseck and Holdsworth, 1977;Scott, 1977). The purpose of the current paper is (a) to update those studies by including data on Zaisho, and (b) to provide additional information on an intriguing mineral, phosphoran olivine. Shima et al. (1980) provided a brief description of Zaisho, but did not note some of its more unusual and interesting features such as the presence of pyroxene and phosphoran olivine.We obtained a small (0.80 gm) chip of Zaisho, just large enough for a polished section. The mineralogy and texture of the meteorite are fairly typical of pallasites. It contains metal, olivine, chromite, phosphates, pyroxene, troilite, and schreibersite, with the last three in minor to trace amounts. Our specimen has a greater volume of chromite than olivine, which is atypical of pallasites; however, this is almost certainly a consequence of both the small and presumably unrepresentative sample and the heterogeneity of paltasites. Unusual features are the occurrence of phosphoran olivine (this is only the fourth meteorite from which this material has been described), pyroxene, and a

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“…Whitlockites are visually identified according to the criteria described by Buseck and Holdsworth (1977) and Pellas et al (1983).…”

Section: Meteorite Samples and Experimental Proceduresmentioning

confidence: 99%

“…Only two attempts to date pallasites by fission-track method have been reported (Pellas et al, 1983;Bondar and Perelygin, 2001).…”

Section: Introductionmentioning

confidence: 98%