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General Information
File Identifier: gov.noaa.ngdc.mgg.geology:G04150
Metadata Date Stamp: 2014-05-05
Organization: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Organization Role: pointOfContact
Identification Information
Title: Age, spreading rates, and spreading asymmetry of the world's ocean crust
Dataset Publication Date: 2008-12-31
Abstract: 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.
Credit Cite as: Muller, R. D., M. Sdrolias, C. Gaina, and W. R. Roest (2008), Age, spreading rates, and spreading asymmetry of the world's ocean crust, Geochem. Geophys. Geosyst., 9, Q04006, doi:10.1029/2007GC001743.
Constraints Access to this dataset is unrestricted.
Data Type: Grid
Browse Graphic
Browse Graphic URL: http://www.ngdc.noaa.gov/mgg/ocean_age/data/2008/image/age_oceanic_lith.jpg
Browse Graphic Caption: crustal ages
Browse Graphic Type: JPEG
Data Theme
Theme Topics: Geological and Geophysical, Oceans and Estuaries
Reference System Information
Reference System URN: urn:ogc:def:crs:EPSG:4326
Spatial Domain
West Bounding Longitude: -180.0
South Bounding Latitude: -90.0
East Bounding Longitude: 180.0
North Bounding Latitude: 90.0
Zoom to the resource envelope
Beginning Date: 2008-12-31
Ending Date: 2008-12-31
Data Quality Information
Scope (quality information applies to): Dataset
Data History: Lineage prior to transfer to NGDC is unknown.
Contact Information
Organization: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Contact Position: Marine Geology Data Manager
Address: 325 Broadway, Mail Code E/GC3
City: Boulder
State: CO
Postal Code: 80305-3328
Country: USA
Email: geology.info@noaa.gov
Telephone: (303) 497-6339
Fax: (303) 497-6513
Distribution Information
Format Name: ASCII
Format Version: UTF-8
Distribution Link: http://www.ngdc.noaa.gov/mgg/ocean_age/ocean_age_2008.html
Distribution Link Function: Information
Metadata Reference Information
Acquisition Information
Instrument: In Situ/Laboratory Instruments
Platform: In Situ Ocean-based Platforms > SHIPS
/geoportal/rest/document?f=html&id=%7B8AF8DE17-1F9D-47C8-8499-2D9D104155A6%7D
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