Universität zu Köln

Braukmueller, Ninja, Wombacher, Frank ORCID: 0000-0002-0755-8918, Funk, Claudia and Muenker, Carsten (2019). Earth's volatile element depletion pattern inherited from a carbonaceous chondrite-like source. Nat. Geosci., 12 (7). S. 564 - 570. NEW YORK: NATURE PUBLISHING GROUP. ISSN 1752-0908

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Abstract

Earth's volatile element abundances (for example, sulfur, zinc, indium and lead) provide constraints on fundamental processes, such as planetary accretion, differentiation and the delivery of volatile species, like water, which contributed to Earth becoming a habitable planet. The composition of the silicate Earth suggests a chemical affinity but isotopic disparity to carbonaceous chondrites-meteorites that record the early element fractionations in the protoplanetary disk. However, the volatile element depletion pattern of the silicate Earth is obscured by core formation. Another key problem is the overabundance of indium, which could not be reconciled with any known chondrite group. Here we complement recently published volatile element abundances for carbonaceous chondrites with high-precision sulfur, selenium and tellurium data. We show that both Earth and carbonaceous chondrites exhibit a unique hockey stick volatile element depletion pattern in which volatile elements with low condensation temperatures (750-500 K) are unfractionated from each other. This abundance plateau accounts for the apparent overabundance of indium in the silicate Earth without the need of exotic building materials or vaporization from precursors or during the Moon-forming impact and suggests the accretion of 10-15 wt% CI-like material before core formation ceased. Finally, more accurate estimates of volatile element abundances in the core and bulk Earth can now be provided.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Braukmueller, Ninja UNSPECIFIED UNSPECIFIED UNSPECIFIED Wombacher, Frank UNSPECIFIED orcid.org/0000-0002-0755-8918 UNSPECIFIED Funk, Claudia UNSPECIFIED UNSPECIFIED UNSPECIFIED Muenker, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-136705
DOI:	10.1038/s41561-019-0375-x
Journal or Publication Title:	Nat. Geosci.
Volume:	12
Number:	7
Page Range:	S. 564 - 570
Date:	2019
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	NEW YORK
ISSN:	1752-0908
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRACE-ELEMENTS; CHEMICAL-COMPOSITION; CORE FORMATION; PRIMITIVE METEORITES; SIDEROPHILE ELEMENTS; ISOTOPIC COMPOSITION; ACCRETION; SELENIUM; ORIGIN; MANTLE Multiple languages Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13670