Evidence for the early differentiation of the core from Pt–Re–Os isotope systematics of 2.8-Ga komatiites

Komatiite samples from the 2.8-Ga Kostomuksha greenstone belt in the Baltic Shield define Pt–Os and Re–Os isochrons with ages of 2816±190 and 2880±83 Ma, respectively. The mean initial 186Os/188Os and 187Os/188Os ratios calculated at T=2821 Ma are 0.1198341±7 and 0.11042±69 (γ187Os=+2.5±0.6), respec...

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Veröffentlicht in:	Earth and planetary science letters 2005-08, Vol.237 (1-2), p.118-134
Hauptverfasser:	Puchtel, Igor S., Brandon, Alan D., Humayun, Munir, Walker, Richard J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Abundance Archaen komatiite core–mantle interaction Crystallization Enrichment highly siderophile elements Komatiites Mantle Mathematical models Platinum Plumes Pt–Re–Os isotope sytematics
Online-Zugang:	Volltext
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