Universität zu Köln

Elfers, Bo-Magnus ORCID: 0000-0003-0548-772X, Sprung, Peter ORCID: 0000-0003-4862-1415, Messling, Nils and Muenker, Carsten (2020). The combined Zr and Hf isotope inventory of bulk rock and sequentially leached chondrite samples. Geochim. Cosmochim. Acta, 270. S. 475 - 492. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1872-9533

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Abstract

The stepwise acid digestion of primitive chondritic meteorites allows the identification of nucleosynthetic isotope anomalies that are otherwise hidden on the bulk rock scale. Here, we present for the first time combined isotope data for acid leachates, residues, and bulk rock aliquots of several primitive chondrites for the geo- and cosmochemically similar elements Zr and Hf. Our analyses reveal significant Zr and Hf isotope anomalies that (i) are complementary between acid leachates and residues and (ii) well-correlated with each other. The observed Zr and Hf anomalies strongly suggest variable contributions of common s-process carrier phases to the different leachates and residues. Ratios of r- (and p-process) Zr and Hf isotopes appear to be uniform in leachates and residues. In contrast to the well-correlated anomalies found in our leaching experiments, nucleosynthetic Zr and Hf isotope signatures seem to be decoupled on the bulk rock scale. This contrast may result from the heterogeneous distribution of neutron-rich Zr material devoid Hf, or alternatively be caused by the presence of anomalous CAI material which overprinted s-process deficits that were initially correlated. In contrast to a previous study, we find no direct evidence for the presence of a third isotopically distinct nucleosynthetic Zr component. (C) 2019 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Elfers, Bo-Magnus UNSPECIFIED orcid.org/0000-0003-0548-772X UNSPECIFIED Sprung, Peter UNSPECIFIED orcid.org/0000-0003-4862-1415 UNSPECIFIED Messling, Nils UNSPECIFIED UNSPECIFIED UNSPECIFIED Muenker, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-347806
DOI:	10.1016/j.gca.2019.12.008
Journal or Publication Title:	Geochim. Cosmochim. Acta
Volume:	270
Page Range:	S. 475 - 492
Date:	2020
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1872-9533
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ION-EXCHANGE CHROMATOGRAPHY; SOLAR-SYSTEM ABUNDANCES; SILICON-CARBIDE GRAINS; S-PROCESS; CARBONACEOUS CHONDRITES; PRIMITIVE METEORITES; INTERSTELLAR GRAINS; PRESOLAR DIAMOND; ACID LEACHATES; P-PROCESS Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34780