THE LODRAN PRIMITIVE ACHONDRITE: PETROGENETIC INSIGHTS FROM ELECTRON AND ION MICROPROBE ANALYSIS OF OLIVINE AND ORTHOPYROXENE
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dc.contributor.author | Papike J.J. | |
dc.contributor.author | Spilde M.N. | |
dc.contributor.author | Fowler G.W. | |
dc.contributor.author | Layne G.D. | |
dc.contributor.author | Shearer C.K. | |
dc.date.accessioned | 2020-11-27T03:54:35Z | |
dc.date.available | 2020-11-27T03:54:35Z | |
dc.date.issued | 1995 | |
dc.identifier | https://elibrary.ru/item.asp?id=772578 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1995, , 14, 3061-3070 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/19706 | |
dc.description.abstract | The Lodran primitive achondrite is thought to represent some of the earliest events in the differentiation of chondritic asteroids. Most researchers who studied Lodran believe that it is a restite from which a melt, enriched in the incompatible trace and minor elements, was extracted. This process is reflected by a lack of feldspar in the Lodran mineral assemblage. Presumably, after or during melting, a reduction event took place resulting in an increase in Mg/Fe near the rims of both olivine and orthopyroxene. The reduction process is far more advanced in olivine than in pyroxene because of the more rapid Fe#Mg diffusion rates in olivine. Narrow reaction rims (<10 μm) around orthopyroxene grains show a depletion in Ca, Al, Cr, Ti, REEs, and Y and an increase in Mg (reverse zoning). These systematics are largely the result of melting and to a lesser extent of reduction. Significant reaction of olivine has taken place by reduction and/or sulfidatuon and to a lesser extent by melting. This is reflected by a decrease in Fe, Co, and Ni and an increase in Mg towards the rims of olivine. The reactions by which reduction and/or sulfidation of olivine took place are not confirmed. However, the following represent two possible reactions: | |
dc.title | THE LODRAN PRIMITIVE ACHONDRITE: PETROGENETIC INSIGHTS FROM ELECTRON AND ION MICROPROBE ANALYSIS OF OLIVINE AND ORTHOPYROXENE | |
dc.type | Статья |
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