FeO-rich silicates in the Sahara 97159 (EH3) enstatite chondrite: Mineralogy, oxygen isotopic compositions, and origin
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چکیده
منابع مشابه
SIMS measurements on oxygen-isotopic compositions of chondrules and matrix in the Yamato 691 EH3 chondrite
Introduction: Whole rocks, chondrules and matrix from the same chondrite group typically have the same or very similar oxygen-isotopic compositions [e.g., 1]. Among the three major clans of chondrites, enstatite chondrites (ECs) have the most uniform oxygen isotopic compositions (Fig. 1). In order to study oxygen-isotopic heterogeneity of ECs in microscale, we carried out SIMS measurements on c...
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INTRODUCTION The Fe-rich olivine end-member, fayalite (Fa100), occurs in the matrix, chondrules, CAIs, silicate aggregates, and dark inclusions in the oxidized Kaba and Mokoia CV3 chondrites, where it is associated with magnetite and troilite. To help constrain the origin of the fayalite, we measured O-isotope compositions of fayalite (Fa98-100) from two petrographic settings of the Kaba meteor...
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Introduction: Most components of CV chondrites show variable degrees of late-stage alteration resulting in the modification of preexisting mineral assemblages and/or in the formation of new minerals. The conditions and environment under which these processes occurred are highly debated, with arguments in favor of solar nebular as well as asteroidal settings [1]. In the particular case of calciu...
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Introduction: The KLE98300 meteorite is an Antarctic meteorite and is classified as an EH3 chondrite [1]. In this meteorite, we found large numbers of graphite grains associated with Fe-Ni metal. Such graphite grains are considered to be products of parent body metamorphism [2, 3]. Isotopic compositions of carbon and nitrogen in graphite and in bulk meteorites give important clues to the parent...
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Introduction: Libourel and Krot [5] reported the discovery of lithic clasts having granoblastic texture and composed of forsterite and Fe,Ni-metal within Type I chondrules from the CV carbonaceous chondrite Vigarano. They suggested that Type I chondrules consist of an inherited, relict component, mainly forsteritic olivine and ±Fe,Ni-metal, originated from olivine-dominated (dunite-like) mantle...
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ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2003
ISSN: 1086-9379,1945-5100
DOI: 10.1111/j.1945-5100.2003.tb00274.x