Universität zu Köln

Thiemens, Maxwell M., Sprung, Peter ORCID: 0000-0003-4862-1415, Fonseca, Raul O. C. ORCID: 0000-0002-0897-4884, Leitzke, Felipe P. and Muenker, Carsten (2019). Early Moon formation inferred from hafnium-tungsten systematics. Nat. Geosci., 12 (9). S. 696 - 703. NEW YORK: NATURE PUBLISHING GROUP. ISSN 1752-0908

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Abstract

The date of the Moon-forming impact places an important constraint on Earth's origin. Lunar age estimates range from about 30 Myr to 200 Myr after Solar System formation. Central to this age debate is the greater abundance of W-182 inferred for the silicate Moon than for the bulk silicate Earth. This compositional difference has been explained as a vestige of less late accretion to the Moon than to the Earth after core formation. Here we present high-precision trace element composition data from inductively coupled plasma mass spectrometry for a wide range of lunar samples. Our measurements show that the Hf/W ratio of the silicate Moon is higher than that of the bulk silicate Earth. By combining these data with experimentally derived partition coefficients, we found that the W-182 excess in lunar samples can be explained by the decay of the now extinct Hf-182 to W-182. Hf-182 was only extant for the first 60 Myr after the Solar System formation. We conclude that the Moon formed early, approximately 50 Myr after the Solar System, and that the excess W-182 of the silicate Moon is unrelated to late accretion.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Thiemens, Maxwell M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sprung, Peter UNSPECIFIED orcid.org/0000-0003-4862-1415 UNSPECIFIED Fonseca, Raul O. C. UNSPECIFIED orcid.org/0000-0002-0897-4884 UNSPECIFIED Leitzke, Felipe P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Muenker, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-143199
DOI:	10.1038/s41561-019-0398-3
Journal or Publication Title:	Nat. Geosci.
Volume:	12
Number:	9
Page Range:	S. 696 - 703
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 FIELD STRENGTH ELEMENTS; BULK SILICATE EARTH; HF-W CHRONOMETRY; ISOTOPIC EVIDENCE; CORE FORMATION; SIDEROPHILE ELEMENTS; FORMING IMPACT; LUNAR; MANTLE; DIFFERENTIATION Multiple languages Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14319