Orthopyroxene-olivine assemblages in diogenites and mesosiderites期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Orthopyroxene-olivine assemblages in diogenites and mesosiderites

Authors:	Roger H Hewins

Institution:	Department of Geological Sciences, Rutgers University, New Brunswick, NJ 08903, U.S.A.

Abstract:	Diogenites contain equilibrated orthopyroxene-olivine assemblages. Mn is very regularly partitioned between olivine and orthopyroxene in pallasites, diogenites and synthetic eucrite melts, with an $FeO MnO$ partition ratio for olivine versus orthopyroxene of 1.6 by weight over a very wide range of FeO contents. In contrast to diogenites, Fe and Mn are not regularly partitioned between the olivine and orthopyroxene of mesosiderites and these minerals were not in equilibrium. Mesosiderite olivine differs from diogenite olivine in $Fe Mn$ and $Ca Mn$ ratios. Lack of olivine-orthopyroxene equilibrium suggests that olivine in mesosiderites was derived not from a pyroxenite component analogous to diogenites but from dunites.

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