Dating the Growth of Oceanic Crust at a Slow-Spreading Ridge-Reference-Cited by-同舟云学术

Dating the Growth of Oceanic Crust at a Slow-Spreading Ridge

Published:2005-10-28 Issue:5748 Volume:310 Page:654-657
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Schwartz Joshua J.¹²³,John Barbara E.¹²³,Cheadle Michael J.¹²³,Miranda Elena A.¹²³,Grimes Craig B.¹²³,Wooden Joseph L.¹²³,Dick Henry J. B.¹²³

Affiliation:

1. Department of Geology and Geophysics, University of Wyoming, Laramie, WY 82071, USA.

2. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, USA.

3. Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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