Age, spreading rates, and spreading asymmetry of the world’s ocean crustAlternate Views: Get Data, FAQ, ISO Rubric, DOI Rubric, CSW, HTML, Components, XML
Age, spreading rates, and spreading asymmetry of the world’s ocean crust
doi:10.1029/2007GC001743
browse graphicThe 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.

Get the Data
AccessFormat(s)Distributor(s) / Contact InfoInstructions / Constraints
information
http://www.ngdc.noaa.gov/mgg/ocean_age/ocean_age_2008.html
NGDC web page of information about the database including links to full documentation and free data download from NGDC.
download
http://www.earthbyte.org/Resources/agegrid2008.html
Alternate download from the originator.
ASCII
Format version: UTF-8
Format specification: American Standard Code for Information Interchange (ASCII) text format.
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
(303) 497-6339
7:30 - 5:00 Mountain
Fees
free online download

Use Limitation
Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.

Legal Constraints
Access
otherRestrictions

Other
Access to this dataset is unrestricted.

Other
Citation Recommendation: Cite as: Muller, R.D., M. Sdrolias, C. Gaina, and W.R. Roest 2008. Age, spreading rates and spreading symmetry of the world’s ocean crust, Geochem. Geophys. Geosyst., 9, Q04006, doi:10.1029/2007GC001743.

Use Limitation
otherRestrictions

Other
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.

Security Constraints
Classification
unclassified