Universität zu Köln

Fischer-Goedde, Mario, Schwander, Daniel and Ott, Ulrich (2018). Ruthenium Isotope Composition of Allende Refractory Metal Nuggets. Astron. J., 156 (4). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-3881

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Abstract

Refractory metal nuggets (RMNs) are among the first solids formed in the nascent solar system. They contain high abundances of refractory metals like Re, Os, W, Ir, Ru, and Pt. The isotopic compositions of these elements bear testimony to the stellar sources that contributed to the nucleosynthetic makeup of our solar system. We report the first high-precision Ru isotope data for a bulk RMN sample prepared from the Allende meteorite. The RMNs display well-resolved mass-independent anomalies with positive anomalies for Ru-96, Ru-98, Ru-100, Ru-102, and Ru-104. These are best explained by a deficit in r-process combined with a slight deficit in p-process nuclides. This finding stands in stark contrast to the s-process deficit isotopic patterns observed for Allende Ca-Al-rich inclusions (CAIs), bulk Allende, and other bulk meteorites. The contrasting r-, p-deficit versus s-deficit Ru isotopic signatures observed between RMNs and CAIs is surprising, given that CAIs are assumed to be a major host phase of RMNs. One way to explain the s-deficit patterns observed for CAIs and bulk meteorites is that r- and p-process Ru nuclides were added to the solar nebula after RMN formation and prior to the formation of CAIs and the accretion of meteorite parent bodies. A possible source may have been a nearby core-collapse supernova that injected freshly synthesized r- and p-process nuclides into the nascent solar system. The injection of such r- and p-enriched matter represents an alternative mechanism to account for the s-process variability presented by CAIs and bulk carbonaceous meteorites.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fischer-Goedde, Mario UNSPECIFIED UNSPECIFIED UNSPECIFIED Schwander, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Ott, Ulrich UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-171155
DOI:	10.3847/1538-3881/aadf33
Journal or Publication Title:	Astron. J.
Volume:	156
Number:	4
Date:	2018
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-3881
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EARLY SOLAR-SYSTEM; AL-RICH INCLUSIONS; S-PROCESS; CARBONACEOUS CHONDRITES; SILICON-CARBIDE; STELLAR NUCLEOSYNTHESIS; CA,AL-RICH INCLUSION; PROTOPLANETARY DISK; OPAQUE ASSEMBLAGES; ORIGIN Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17115