| Reference Type | Journal (article/letter/editorial) |
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| Title | Mössbauer study of redox processes in the evolution of chondrites |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Malysheva, T. V. | Author |
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| Year | 1994 (March) | Volume | 58 |
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| Issue | 390 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_58/58-390-151.pdf+ |
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| DOI | doi:10.1180/minmag.1994.058.390.14Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 2011 | Long-form Identifier | mindat:1:5:2011:8 |
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| GUID | 0 |
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| Full Reference | Malysheva, T. V. (1994) Mössbauer study of redox processes in the evolution of chondrites. Mineralogical Magazine, 58 (390) 151-158 doi:10.1180/minmag.1994.058.390.14 |
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| Plain Text | Malysheva, T. V. (1994) Mössbauer study of redox processes in the evolution of chondrites. Mineralogical Magazine, 58 (390) 151-158 doi:10.1180/minmag.1994.058.390.14 |
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| In | (1994, March) Mineralogical Magazine Vol. 58 (390) Mineralogical Society |
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| Abstract/Notes | AbstractThe evolution of Fe-containing phases of carbonaceous chondrites heated under various oxidation-reduction conditions was investigated by means of Mössbauer spectroscopy. Heating of the lower petrological types of chondrites (CM2) released gases which initially produced oxidizing conditions (∼450°C) and then reducing conditions (> 700°C Phase transformation occurred rapidly (during 1–5 minutes) at all temperatures. During heating the Fe-bearing phyllosilicate phases in CM2-chondrite converted to Fe-bearing olivine, metallic iron and troilite (pentlandite). These phases resemble those of CO3, CV3 and EH-chondrites. Iron distribution resembling that of ordinary chondrites (some additional Fe2+ in pyroxene) was obtained only by heating a mixture of oxidized matter (CM2) with reduced matter (EH).A phase transition discovered at 1050°C is probably the temperature boundary between conditions of formation of the two main components of ordinary chondrites: matrix and chondrules. Chondrules of ordinary chondrites may be formed at temperatures > 1050°C while the matrix forms at temperatures < 1050°C For the carbonaceous chondrite Kainzas (CO3) these temperatures are approximately 1000°C and < 900°C The experimental conditions determined for the evolution of chondrites do not contradict the theoretical two-component model of Wood-Anders-Ringwood and may further its development. |
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