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The CM carbonaceous chondrite regolith Diepenveen
Author(s) -
Langbroek Marco,
Jenniskens Peter,
Kriegsman Leo M.,
Nieuwenhuis Henk,
De Kort Niek,
Kuiper Jacob,
Van Westrenen Wim,
Zolensky Michael E.,
Ziegler Karen,
Yin QingZhu,
Sanborn Matthew E.,
Wimpenny Josh,
Yamakawa Akane,
De Vet Sebastiaan J.,
Meier Matthias M. M.,
Welten Kees C.,
Nishiizumi Kunihiko,
Caffee Marc W.,
Burton Aaron S.,
Dworkin Jason P.,
Glavin Daniel P.,
Wu Qinghao,
Zare Richard N.,
Ruf Alexander,
Harir Mourad,
SchmittKopplin Philippe
Publication year - 2019
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/maps.13297
Subject(s) - chondrite , regolith , carbonaceous chondrite , breccia , meteorite , geology , geochemistry , asteroid , mineralogy , astrobiology , physics
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 16 O 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 ‰ lower in δ 17 O. 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 ~5 Ma CRE age, longer than most other CM chondrites, and has a relatively young K‐Ar resetting age of ~1.5 Ga. 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.