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The Cheder iron meteorite (Tuva); mineral composition, structure, and PGE and REE contents

L. V. Agafonov, V. A. Popov, G. N. Anoshin, L. N. Pospelova, V. I. Zabelin and V. I. Kudryavtsev
The Cheder iron meteorite (Tuva); mineral composition, structure, and PGE and REE contents
Russian Geology and Geophysics (June 2011) 52 (6): 620-630

Abstract

The Cheder meteorite, found 23 km south of Kyzyl, has been studied in terms of mineral composition and internal structure. Structurally, it is a medium octahedrite, which measures 26X9 cm and weighs 5.39 kg. Its surface is streamlined and features flow lines. One of the sides, probably that facing the flight direction, features regmaglypts and a sinuous cavern (9X1.5 cm). The meteorite consists of kamacite admixed with taenite. The inside of Widmanstatten bands is of complex kamacite-taenite composition and flanked by taenite lamellae. Phosphides are present in kamacite in small amounts as variously sized and shaped bodies. They are divided into three types depending on the Ni/Fe ratio. Small shapeless wormlike grains, which are usually assigned to rhabdites, consist of nickelphosphide (Ni-rich variety). All the minerals in the meteorite contain Co (up to 0.67 wt.%) and, sometimes, Cu and P (just above the detection limit). The total PGE content of the meteorite is several times higher than that of chromitites, which are one of the terrestrial PGE sources. The REE in the meteorite are dominated by HREE. The total REE content of the meteorite is lower than that of chondrite C1 by two orders of magnitude.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 52
Serial Issue: 6
Title: The Cheder iron meteorite (Tuva); mineral composition, structure, and PGE and REE contents
Affiliation: Russian Academy of Sciences, Siberian Branch, V. S. Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 620-630
Published: 201106
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 17
Accession Number: 2021-068045
Categories: Petrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N51°31'60" - N51°31'60", E94°35'60" - E94°35'60"
Secondary Affiliation: Russian Academy of Sciences, Tuva Institute for Exploration of Natural Resources, RUS, Russian Federation
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202122
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