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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 Library of Congress Subject Headings Library of Congress Subject Headings
    1 NASA/GCMD Data Center Keywords NASA/GCMD Data Center Keywords
      1 NASA/GCMD Instrument Keywords NASA/GCMD Instrument Keywords
        1 NASA/GCMD Location Keywords NASA/GCMD Location Keywords
          1 NASA/GCMD Platform Keywords NASA/GCMD Platform Keywords
            1 NASA/GCMD Project Keywords NASA/GCMD Project Keywords
              1 NASA/GCMD Science Keywords NASA/GCMD Science Keywords
                1 NASA/Global Change Master Directory (GCMD) Platform Keywords NASA/Global Change Master Directory (GCMD) Platform Keywords
                • 2008-02-05
                1 SeaDataNet Common Vocabularies SeaDataNet Common Vocabularies
                  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
                  7 GCMD Valids custodian http://gcmd.nasa.gov/learn/keyword_list.html
                  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 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
                  7 GCMD User Support Office NASA GCMD User Support Office gcmduso@gcmd.gsfc.nasa.gov custodian http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
                  1 National Geophysical Data Center, NOAA publisher
                  1 R. Dietmar Muller School of Geosciences, University of Sydney, Australia originator
                  1 resourceProvider - SeaDataNet SeaDataNet resourceProvider http://www.seadatanet.org/Standards-Software/Common-Vocabularies
                  1 resourceProvider - US Library of Congress US Library of Congress resourceProvider http://id.loc.gov/authorities/subjects
                  1 Walter R. Roest Departement Geosciences Marines, Plouzane, France originator
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                  CI_OnlineResource

                  Count Component Linkage Name Description Function
                  7 http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso GCMD Feedback Form Have a Comment for the GCMD? information
                  7 GCMD Keyword Page http://gcmd.nasa.gov/learn/keyword_list.html GCMD Keywords Page This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. information
                  1 http://id.loc.gov/authorities/subjects Library of Congress Subject Headings (LCSH) The Library of Congress Subject Headings (LCSH) are part of a Linked Data Service, actively maintained since 1898 to catalog materials held at the Library of Congress. 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
                  1 http://www.seadatanet.org/Standards-Software/Common-Vocabularies SeaDataNet Common Vocabularies The SeaDataNet Vocabulary Server is populated with lists describing a wide range of entities relevant to marine metadata and data such as parameters, sea area names, platform classes, instrument types, and so on. information
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                  MD_Identifier or RS_Identifier

                  Count Component Code
                  1 In Situ Ocean-based Platforms > SHIPS
                  1 In Situ/Laboratory Instruments
                  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 In Situ Ocean-based Platforms > SHIPS In Situ Ocean-based Platforms > SHIPS Various ocean-based and lake-based ships, boats, remotely operated vehicles, submersibles, and other unspecified types of platforms
                  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

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