Age, spreading rates, and spreading asymmetry of the world's ocean crust

The authors present four companion digital models of the age, age uncertainty, spreading rates and spreading asymmetries of the world's ocean basins as geographic and Mercator grids with 2 minute resolution. The grids include data from all the major ocean basins as well as detailed reconstructions of back-arc basins. The age, spreading rate and asymmetry at each grid node is determined by linear interpolation between adjacent seafloor isochrons in the direction of spreading. Ages for ocean floor between the oldest identified magnetic anomalies and continental crust are interpolated by geological estimates of the ages of passive continental margin segments. The age uncertainties for grid cells coinciding with marine magnetic anomaly identifications, observed or rotated to their conjugate ridge flanks, are based on the difference between gridded age and observed age. The uncertainties are also a function of the distance of a given grid cell to the nearest age observation, and the proximity to fracture zones or other age discontinuities. Asymmetries in crustal accretion appear to be frequently related to asthenospheric flow from mantle plumes to spreading ridges, resulting in ridge jumps towards hotspots. The authors also use the new age grid to compute global residual basement depth grids from the difference between observed oceanic basement depth and predicted depth using two alternative age-depth relationships. The new set of grids helps to investigate prominent negative depth anomalies, which may be alternatively related to subducted slab material descending in the mantle or to asthenospheric flow. A combination of these digital grids and the associated relative and absolute plate motion model with seismic tomography and mantle convection model outputs represent a valuable set of tools to investigate geodynamic problems.

Data and Resources

Additional Info

Field Value
Last Updated June 10, 2017, 18:12
Created June 10, 2017, 18:12
access_constraints ["Access to this dataset is unrestricted.", "Cite as: Muller, R.D., M. Sdrolias, C. Gaina, and W.R. Roest 2008.\n Age, spreading rates and spreading symmetry of the world's ocean crust, Geochem.\n Geophys. Geosyst., 9, Q04006, doi:10.1029/2007GC001743.", "While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty."]
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contact-email geology.info@noaa.gov
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2008-12-31"}, {"type": "revision", "value": "2008-12-31"}]
frequency-of-update unknown
graphic-preview-description crustal ages
graphic-preview-file https://www.ngdc.noaa.gov/mgg/ocean_age/data/2008/image/age_oceanic_lith.jpg
graphic-preview-type JPEG
guid gov.noaa.ngdc.mgg.geology:G04150
licence ["Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States."]
metadata-date 2015-12-31
metadata-language eng: USA
progress ongoing
resource-type dataset
responsible-party [{"name": "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce", "roles": ["pointOfContact"]}]
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temporal-extent-begin 2008-12-31
temporal-extent-end 2008-12-31