New W-isotope evidence for rapid terrestrial accretion and very early core formation

Schoenberg, R, Kamber, BS, Collerson, KD and Eugster, O (2002) New W-isotope evidence for rapid terrestrial accretion and very early core formation. Geochimica Et Cosmochimica Acta, 66 17: 3151-3160. doi:10.1016/S0016-7037(02)00911-0

Author Schoenberg, R
Kamber, BS
Collerson, KD
Eugster, O
Title New W-isotope evidence for rapid terrestrial accretion and very early core formation
Journal name Geochimica Et Cosmochimica Acta   Check publisher's open access policy
ISSN 0016-7037
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1016/S0016-7037(02)00911-0
Open Access Status Not yet assessed
Volume 66
Issue 17
Start page 3151
End page 3160
Total pages 9
Editor F. A. Podosek
L. Trower
Place of publication United Kingdom
Publisher Pergamon
Language eng
Subject C1
260301 Geochronology and Isotope Geochemistry
780104 Earth sciences
Abstract The short-lived Hf-182-W-182-isotope system is an ideal clock to trace core formation and accretion processes of planets. Planetary accretion and metal/silicate fractionation chronologies are calculated relative to the chondritic Hf-182-W-182-isotope evolution. Here, we report new high-precision W-isotope data for the carbonaceous chondrite Allende that are much less radiogenic than previously reported and are in good agreement with published internal Hf-W chronometry of enstatite chondrites. If the W-isotope composition of terrestrial rocks, representing the bulk silicate Earth, is homogeneous and 2.24 epsilon(182W) units more radiogenic than that of the bulk Earth, metal/silicate differentiation of the Earth occurred very early. The new W-isotope data constrain the mean time of terrestrial core formation to 34 million years after the start of solar system accretion. Early terrestrial core formation implies rapid terrestrial accretion, thus permitting formation of the Moon by giant impact while Hf-182 was still alive. This could explain why lunar W-isotopes are more radiogenic than the terrestrial value. Copyright (C) 2002 Elsevier Science Ltd.
Keyword Geochemistry & Geophysics
Early Solar-system
Collisional History
Tungsten Isotopes
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
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Created: Wed, 15 Aug 2007, 04:10:44 EST