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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 NASA/GCMD Data Center Keywords NASA/GCMD Data Center Keywords
    2015-03-01
    1995-04-24
1 NASA/GCMD Project Keywords NASA/GCMD Project Keywords
    2015-03-01
    1995-04-24
Unresolved Xlinks
Library of Congress Subject Headings at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[2]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]
SeaDataNet Common Vocabularies at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[3]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]
NASA/GCMD Science Keywords at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[4]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]
NASA/GCMD Platform Keywords at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[5]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]
NASA/GCMD Instrument Keywords at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[6]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]
NASA/GCMD Location Keywords at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[8]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]
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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 Carmen Gaina Center for Geodynamics, Geological Survey of Norway, Trondheim, Norway originator
1 NCEI (publisher) DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce publisher
1 EarthByte Group, School of Geosciences, University of Sydney, Australia publisher
1 Maria Sdrolias EarthByte Group, School of Geosciences, University of Sydney, Australia originator
2 pointOfContact - DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Marine Geology Data Manager DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Marine Geology Data Manager geology.info@noaa.gov pointOfContact
1 R. Dietmar Muller School of Geosciences, University of Sydney, Australia originator
1 Walter R. Roest Departement Geosciences Marines, Plouzane, France originator
Unresolved Xlinks
GCMD User Support Office at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[1]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[1]
GCMD Valids at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[1]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
GCMD User Support Office at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[7]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[1]
GCMD Valids at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[7]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
Marine Geology Data Manager - distributor - DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce at: /gmi:MI_Metadata/gmd:distributionInfo[1]/gmd:MD_Distribution[1]/gmd:distributor[1]/gmd:MD_Distributor[1]/gmd:distributorContact[1]
custodian - DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce at: /gmi:MI_Metadata/gmd:metadataMaintenance[1]/gmd:MD_MaintenanceInformation[1]/gmd:contact[1]
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CI_OnlineResource

Count Component Linkage Name Description Function
1 http://www.earthbyte.org/Resources/agegrid2008.html http://www.earthbyte.org/Resources/agegrid2008.html Alternate download from the originator. download
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 data set with links to download data and documentation from NCEI. information
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MD_Identifier or RS_Identifier

Count Component Code
1 doi:10.1029/2007GC001743
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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 NCEI Copyright Statement Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States.
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MD_ReferenceSystem

Unresolved Xlinks
European Petroleum Survey Group (EPSG) Geodetic Parameter Registry at: /gmi:MI_Metadata/gmd:referenceSystemInfo[1]
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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

Unresolved Xlinks
NOAA/NCEI Marine Geology WAF at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:aggregationInfo[1]
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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

Unresolved Xlinks
In Situ Ocean-based Platforms > SHIPS at: /gmi:MI_Metadata/gmi:acquisitionInformation[1]/gmi:MI_AcquisitionInformation[1]/gmi:platform[1]
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MI_Instrument

Unresolved Xlinks
In Situ/Laboratory Instruments at: /gmi:MI_Metadata/gmi:acquisitionInformation[1]/gmi:MI_AcquisitionInformation[1]/gmi:instrument[1]
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