Tungsten isotope evidence from similar to 3.8-Gyr metamorphosed sediments for early meteorite bombardment of the Earth

Schoenberg, R, Kamber, BS, Collerson, KD and Moorbath, S (2002) Tungsten isotope evidence from similar to 3.8-Gyr metamorphosed sediments for early meteorite bombardment of the Earth. Nature, 418 25: 403-405. doi:10.1038/nature00923


Author Schoenberg, R
Kamber, BS
Collerson, KD
Moorbath, S
Title Tungsten isotope evidence from similar to 3.8-Gyr metamorphosed sediments for early meteorite bombardment of the Earth
Journal name Nature   Check publisher's open access policy
ISSN 0028-0836
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1038/nature00923
Open Access Status Not Open Access
Volume 418
Issue 25
Start page 403
End page 405
Total pages 3
Editor P. Campbell
Place of publication United Kingdom
Publisher Nature Publishing Group
Language eng
Subject C1
260301 Geochronology and Isotope Geochemistry
780104 Earth sciences
Abstract The 'Late Heavy Bombardment' was a phase in the impact history of the Moon that occurred 3.8-4.0 Gyr ago, when the lunar basins with known dates were formed(1,2). But no record of this event has yet been reported from the few surviving rocks of this age on the Earth. Here we report tungsten isotope anomalies, based on the Hf-182-W-182 system (half-life of 9 Myr), in metamorphosed sedimentary rocks from the 3.7-3.8-Gyr-old Isua greenstone belt of West Greenland and closely related rocks from northern Labrador, Canada. As it is difficult to conceive of a mechanism by which tungsten isotope heterogeneities could have been preserved in the Earth's dynamic crust-mantle environment from a time when short-lived Hf-182 was still present, we conclude that the metamorphosed sediments contain a component derived from meteorites.
Keyword Geochemistry & Geophysics
Early Solar-system
West Greenland
Chondrites
Accretion
Differentiation
Carbon
Multidisciplinary Sciences
Q-Index Code C1

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, 04:10:05 EST