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Metadata Identifier: gov.noaa.ngdc.mgg.geology:G04150

Aggregation Info | Bands | Citations | Constraints | Coverage Descriptions | Dimensions | Extents | Formats | Geographic Bounding Box
Georectified Information | Georeferenceable Information | Identifiers | Instruments | Mediums | OnlineResources | Operations
Platforms | Process Steps | Range Elements | Reference Systems | Responsible Parties | Series | Sources | Spatial Grids | Temporal Extents

MD_DataIdentification

Count Component Title Abstract
1 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.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 Age, spreading rates, and spreading asymmetry of the world's ocean crust
  • 2008-12-31
  • 2008-12-31
doi:10.1029/2007GC001743
1 Documentation
  • 2008-12-31
1 European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
  • 2008-11-12
1 INFOTERRA Keyword Thesaurus
    1 NASA/GCMD Data Center Keywords
      1 NASA/GCMD Earth Project Keywords
        1 NASA/GCMD Earth Science Keywords
          1 NASA/GCMD Instrument Keywords
            1 NASA/GCMD Location Keywords
              1 NASA/GCMD Platform Keywords
                1 NASA/Global Change Master Directory (GCMD) Platform Keywords NASA/Global Change Master Directory (GCMD) Platform Keywords
                • 2008-02-05
                1 The NGDC Marine Geology Data Archive
                • 1976-12-31
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                CI_Series

                Count Component Name Issue Identification Page
                1 Geochemistry, Geophysics, Geosystems Volume 9, Issue 4, April 2008
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                CI_ResponsibleParty

                Count Component Individual Organization Position Email Role Linkage
                1 Carla J. Moore - custodian - DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Carla J. Moore DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Marine Geology Data Manager geology.info@noaa.gov custodian
                1 Carmen Gaina Center for Geodynamics, Geological Survey of Norway, Trondheim, Norway originator
                2 Marine Geology Data Manager - pointOfContact - 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 Marine Geology Data Manager geology.info@noaa.gov pointOfContact
                1 Marine Geology Data Manager - distributor - 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 Marine Geology Data Manager geology.info@noaa.gov distributor
                1 EarthByte Group, School of Geosciences, University of Sydney, Australia publisher
                1 European Petroleum Survey Group http://www.epsg-registry.org/
                1 Maria Sdrolias EarthByte Group, School of Geosciences, University of Sydney, Australia originator
                1 GCMD Valids NASA Global Change Master Directory (GCMD) gcmduso@gcmd.gsfc.nasa.gov custodian http://gcmd.nasa.gov/Resources/valids/
                1 GCMD User Support Office NASA Global Change Master Directory (GCMD) User Support Office gcmduso@gcmd.gsfc.nasa.gov custodian http://gcmd.nasa.gov/index.html
                1 National Geophysical Data Center, NOAA publisher
                1 R. Dietmar Muller School of Geosciences, University of Sydney, Australia originator
                1 Walter R. Roest Departement Geosciences Marines, Plouzane, France originator
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                CI_OnlineResource

                Count Component Linkage Name Description Function
                1 No Title http://gcmd.nasa.gov/Resources/valids/ NASA Global Change Master Directory (GCMD) Keyword Page This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. download
                1 No Title http://gcmd.nasa.gov/index.html NASA Global Change Master Directory (GCMD) Home Page information
                1 http://www.earthbyte.org/Resources/agegrid2008.html http://www.earthbyte.org/Resources/agegrid2008.html Alternate download from the originator. download
                1 http://www.epsg-registry.org/ European Petroleum Survey Group Geodetic Parameter Dataset Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations. search
                1 http://www.ngdc.noaa.gov/mgg/ocean_age/ocean_age_2008.html 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. information
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                MD_Identifier or RS_Identifier

                Count Component Code
                1 In Situ/Laboratory Instruments
                1 SHIPS > SHIPS
                1 doi:10.1029/2007GC001743
                1 urn:ogc:def:crs:EPSG:4326
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                EX_Extent

                Bounding Box Temporal Extent
                Count Component Description West East North South Start End
                1 Global sea floor -180.0 180.0 90.0 -90.0 2008-12-31 2008-12-31
                Unresolved Xlinks
                #boundingExtent at: /gmi:MI_Metadata/gmd:dataQualityInfo[1]/gmd:DQ_DataQuality[1]/gmd:scope[1]/gmd:DQ_Scope[1]/gmd:extent[1]
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                EX_GeographicBoundingBox

                Count Component West East North South
                1 -180.0 180.0 90.0 -90.0
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                EX_TemporalExtent

                Count Component Start End
                1 2008-12-31 2008-12-31
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                MD_Format

                Count Component Name Version specification
                1 ASCII UTF-8 American Standard Code for Information Interchange (ASCII) text format.
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                MD_Medium

                none found
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                MD_Constraints

                Count Component Use Limitation
                1 NGDC Copyright Statement Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.
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                MD_ReferenceSystem

                Count Component Code Authority Title
                1 European Petroleum Survey Group (EPSG) Geodetic Parameter Registry urn:ogc:def:crs:EPSG:4326 European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
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                MD_GridSpatialRepresentation

                none found
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                MD_Georeferenceable or MI_Georeferenceable

                none found
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                MD_Georectified or MI_Georectified

                none found
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                MD_Dimension

                none found
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                MD_CoverageDescription or MI_CoverageDescription

                Count Component Attribute Description Content Type
                1 digital model of age, age uncertainty, spreading rate, and spreading asymmetries
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                MD_Band or MI_Band

                Count Component Identifier Descriptor
                1 gridded age 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.
                1 gridded age uncertainty 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.
                1 gridded spreading rate Rate of accretion of ocean crust.
                1 gridded spreading asymmetries Asymmetries in crustal accretion appear to be frequently related to asthenospheric flow from mantle plumes to spreading ridges, resulting in ridge jumps towards hotspots.
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                MI_RangeElementDescription

                none found
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                MD_AggregateInformation

                Count Component Title Code Association Type Code
                1 The NGDC Marine Geology Data Archive largerWorkCitation
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                LE_Source or LI_Source

                Count Component Title Date Description
                1 Unknown Dietmar Muller
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                LE_ProcessStep or LI_ProcessStep

                Count Component DateTime Description
                1 2008-12-31T00:00:00 Received data from originator
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                MI_Operation

                none found
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                MI_Platform

                Count Component Code Description
                1 SHIPS > SHIPS SHIPS > SHIPS Various ships
                Unresolved Xlinks
                SHIPS > SHIPS at: /gmi:MI_Metadata/gmi:acquisitionInformation[1]/gmi:MI_AcquisitionInformation[1]/gmi:platform[1]
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                MI_Instrument

                Count Component Code Type Description
                1 In Situ/Laboratory Instruments In Situ/Laboratory Instruments instrument
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