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The CM carbonaceous chondrite regolith Diepenveen.
Meteorit. Planet. Sci. 54, 1431-1461 (2019)
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A carbonaceous chondrite was recovered immediately after the fall near the village of Diepenveen in the Netherlands on October 27, 1873, but came to light only in 2012. Analysis of sodium and poly-aromatic hydrocarbon content suggests little contamination from handling. Diepenveen is a regolith breccia with an overall petrology consistent with a CM classification. Unlike most other CM chondrites, the bulk oxygen isotopes are extremely O-16 rich, apparently dominated by the signature of anhydrous minerals, distributed on a steep slope pointing to the domain of intrinsic CM water. A small subset plots closer to the normal CM regime, on a parallel line 2 parts per thousand lower in delta O-17. Different lithologies in Diepenveen experienced varying levels of aqueous alteration processing, being less aqueously altered at places rather than more heated. The presence of an agglutinate grain and the properties of methanol-soluble organic compounds point to active impact processing of some of the clasts. Diepenveen belongs to a CM clan with similar to 5Ma CRE age, longer than most other CM chondrites, and has a relatively young K-Ar resetting age of similar to 1.5Ga. As a CM chondrite, Diepenveen may be representative of samples soon to be returned from the surface of asteroid (162173) Ryugu by the Hayabusa2 spacecraft.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Spectral Reflectance Properties; Amino-acid Analyses; Aqueous Alteration; Oxygen-isotope; Cosmogenic Nuclides; Cigarette-smoke; Organic-matter; Stony Meteorites; Paris Meteorite; Earliest Stages
ISSN (print) / ISBN 1086-9379
Journal Meteoritics & Planetary Science
Quellenangaben Volume: 54, Issue: 7, Pages: 1431-1461
Publisher University of Arizona, Department of Geosciences
Publishing Place 111 River St, Hoboken 07030-5774, Nj Usa
Institute(s) Research Unit Analytical BioGeoChemistry (BGC)