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Tungsten isotope evidence from approximately 3.8-Gyr metamorphosed sediments for early meteorite bombardment of the Earth.
MedLine Citation:
PMID:  12140554     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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. 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 (182)Hf (182)W 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 (182)Hf was still present, we conclude that the metamorphosed sediments contain a component derived from meteorites.
Authors:
Ronny Schoenberg; Balz S Kamber; Kenneth D Collerson; Stephen Moorbath
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  418     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2002 Jul 
Date Detail:
Created Date:  2002-07-25     Completed Date:  2002-08-13     Revised Date:  2003-11-03    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  403-5     Citation Subset:  -    
Affiliation:
Advanced Centre for Queensland University Research Excellence, The University of Queensland, St Lucia, Queensland 4072, Australia. ronnY@earth.uq.edu.au
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