Universität zu Köln

Pack, Andreas, Vogel, Ingo, Rollion-Bard, Claire, Luais, Beatrice and Palme, Herbert (2011). Silicon in iron meteorite metal. Meteorit. Planet. Sci., 46 (10). S. 1470 - 1484. HOBOKEN: WILEY. ISSN 1945-5100

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Abstract

We report Si concentrations in the metal phases of iron meteorites. Analyses were performed by secondary ion mass spectrometry using a CAMECA 1270 ion probe. The Si concentrations are low (0.09-0.46 mu g g(-1)), with no apparent difference in concentration between magmatic and nonmagmatic iron meteorites. Coexisting kamacite and Ni-rich metal phases have similar Si contents. Thermodynamic calculations show that Fe,Ni-metal in equilibrium with silicate melts at temperatures where metal crystallizes should contain approximately 100 times more Si than found in iron meteorites in this work. The missing Si may either occur as tiny silicate inclusions in metal or it may have diffused as Si-metal into surrounding silicates at low temperatures. In both cases, extensive low-temperature diffusion of Si in metal is required. It is therefore concluded that low Si in iron meteorites is a result of subsolidus reactions during slow cooling.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Pack, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Vogel, Ingo UNSPECIFIED UNSPECIFIED UNSPECIFIED Rollion-Bard, Claire UNSPECIFIED UNSPECIFIED UNSPECIFIED Luais, Beatrice UNSPECIFIED UNSPECIFIED UNSPECIFIED Palme, Herbert UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-487883
DOI:	10.1111/j.1945-5100.2011.01239.x
Journal or Publication Title:	Meteorit. Planet. Sci.
Volume:	46
Number:	10
Page Range:	S. 1470 - 1484
Date:	2011
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1945-5100
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CHEMICAL CLASSIFICATION; GERMANIUM CONCENTRATIONS; CORE FORMATION; COOLING RATES; ORIGIN; FRACTIONATION; SEGREGATION; ELEMENT; MELTS; IAB Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48788