Universität zu Köln

Peters, Stefan T. M., Muenker, Carsten, Becker, Harry and Schulz, Toni ORCID: 0000-0003-1248-7832 (2014). Alpha-decay of Os-184 revealed by radiogenic W-180 in meteorites: Half life determination and viability as geochronometer. Earth Planet. Sci. Lett., 391. S. 69 - 77. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1385-013X

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Abstract

The decay of the rare nuclide Os-184 by alpha emission to W-180 has been theoretically predicted, but was previously never observed in experiments. Variable excesses of W-180 were recently observed for iron meteorites, but the contribution to these excesses by Os-184-decay was regarded as insignificant. Here, we present combined W-180 and Os-W concentration data for meteorites and terrestrial rocks, now indicating that the W-180 heterogeneities can be explained by a-decay of Os-184. A combined Os-184-W-180 isochron for iron meteorites and chondrites yields a decay constant value of lambda Os-184(alpha) of 6.49 +/- 1.34 x 10(-14) a(-1) (half life 1.12 +/- 0.23 x 10(13) yr), in good agreement with theoretical estimates. The Os-184-W-180 decay system may constitute a viable tracer and chronometer for important geological processes like core formation, silicate differentiation or late accretion processes. This is illustrated by a measured W-188-deficit in terrestrial basalts relative to chondrites by 1.16 +/- 0.69 parts in 10000, consistent with core formation similar to 4.5 Ga ago. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Peters, Stefan T. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Muenker, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, Harry UNSPECIFIED UNSPECIFIED UNSPECIFIED Schulz, Toni UNSPECIFIED orcid.org/0000-0003-1248-7832 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-441589
DOI:	10.1016/j.epsl.2014.01.030
Journal or Publication Title:	Earth Planet. Sci. Lett.
Volume:	391
Page Range:	S. 69 - 77
Date:	2014
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1385-013X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language IRON-METEORITES; CORE FORMATION; ISOTOPE SYSTEMATICS; NEUTRON-CAPTURE; COSMOGENIC NUCLIDES; TUNGSTEN ISOTOPES; STONY METEORITES; COOLING HISTORY; PARENT BODIES; OSMIUM Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44158