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Dating the growth of oceanic crust at a slow-spreading ridge

Science

By:
, , , , , ,
DOI: 10.1126/science.1116349

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Abstract

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 ???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 ???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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Dating the growth of oceanic crust at a slow-spreading ridge
Series title:
Science
DOI:
10.1126/science.1116349
Volume
310
Issue:
5748
Year Published:
2005
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
654
Last page:
657
Number of Pages:
4