Schwartz, Joshua J.; John, Barbara E.; Cheadle, Michael J.; Miranda, Elena A.; Grimes, Craig B.; Wooden, Joseph L.; Dick, Henry J. B. (2005): Dating the growth of oceanic crust at a slow-spreading ridge. American Association for the Advancement of Science, Washington, DC, United States, Science, 310 (5748), 654-657, georefid:2006-034502

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 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.
Coverage:
West: 57.1000 East: 57.2500 North: -32.3500 South: -32.5500
Relations:
Expedition: 118
Site: 118-735
Expedition: 176
Site: 176-735
Supplemental Information:
Supporting material available online
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.1126/science.1116349 (c.f. for more detailed metadata)
Data download: application/pdf
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