METALLOGRAPHIC TINT ETCHING REVEALS NICKEL ZONATION PATTERNS IN METEORITIC METAL: APPLICATION TO THE ISHEYEVO (CH/CBb) CARBONACEOUS CHONDRITE
نویسندگان
چکیده
منابع مشابه
MIXTURE OF SEVERAL TYPES OF Fe,Ni METAL GRAINS IN THE ISHEYEVO METEORITE
Introduction: Isheyevo is a metal-rich carbonaceous chon-drite with metal-rich and metal-poor lithologies that are most similar to the CBb and CH chondrites, respectively [1]. All consist of similar components – Fe,Ni metal, chondrules, refractory inclusions, amoeboid olivine aggregates and heavily hydrated lithic clasts. We continued our investigation of these components of Isheyevo and found ...
متن کاملEvidence for Post-impact Plume Origin of Porphyritic Chondrules in Isheyevo (ch/cb) and Ch Carbonaceous Chondrites
It is suggested metal-rich carbonaceous chondrites (CCs), CB, CH and Isheyevo, contain various proportions of chondritic components (CAIs, chondrules, metal) formed (i) by melting, evaporation, and condensation processes in an impact plume resulted from a planetary-scale collision, and (ii) by thermal processing of dust aggregates in the protoplanetary disk (PPD) [1−4]. The impact-plume product...
متن کاملExtreme 16 O Enrichment in Calcium - Aluminium - Rich Inclusions from the Isheyevo ( Ch / Cb )
Introduction: Calcium-aluminum-rich inclusions (CAIs) from the metal-rich (CH/CB-like) carbonaceous chondrite Ish-eyevo are mineralogically pristine and show no evidence for postcrystallization alteration [1]. Many of them are composed of very refractory minerals, such as hibonite (CaAl 12 O 19), grossite (CaAl 4 O 7), aluminum-rich pyroxene, and perovskite (CaTiO 3). We will present oxygen iso...
متن کاملHydrogen Isotopic Composition of N-rich Clasts in the Cb/ch-like Chondrite Isheyevo
Metal-rich (CB, CH, Isheyevo) carbonaceous chondrites are characterized by the highest whole-rock enrichments in 15 N (δ 15 N up to +1500‰) and nearly complete absence of interchondrule fine-grained matrix [e.g., 1]. The fine-grained material occurs mainly as chondritic clasts, which experienced low-temperature aqueous alteration on their initial parent body(ies) and were subsequently accreted ...
متن کاملNanosims Investigation of Presolar Material in Chondrites of the Cr
Introduction: Silicates and oxides are among the most abundant types of presolar dust grains observed in primitive solar system matter [e.g.,1,2]. The CR chondrite clan, consisting of the CR, CH, and CB chondrite groups, contains some of the most primitive meteorites, with characteristic bulk 15 N-enrichments [5,6]. High abundances of presolar silicates and carbonaceous grains were recently rep...
متن کامل