Document Detail


Dating the growth of oceanic crust at a slow-spreading ridge.
MedLine Citation:
PMID:  16254183     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Nineteen uranium-lead zircon ages of lower crustal gabbros from Atlantis Bank, Southwest Indian Ridge, constrain the growth and construction of oceanic crust at this slow-spreading midocean ridge. Approximately 75% of the gabbros accreted within error of the predicted seafloor magnetic age, whereas approximately 25% are significantly older. These anomalously old samples suggest either spatially varying stochastic intrusion at the ridge axis or, more likely, crystallization of older gabbros at depths of approximately 5 to 18 kilometers below the base of crust in the cold, axial lithosphere, which were uplifted and intruded by shallow-level magmas during the creation of Atlantis Bank.
Authors:
Joshua J Schwartz; Barbara E John; Michael J Cheadle; Elena A Miranda; Craig B Grimes; Joseph L Wooden; Henry J B Dick
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  310     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-10-28     Completed Date:  2005-11-23     Revised Date:  2007-03-19    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  654-7     Citation Subset:  -    
Affiliation:
Department of Geology and Geophysics, University of Wyoming, Laramie, WY 82071, USA.
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