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Age, spreading rates, and spreading asymmetry of the world's ocean crust

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            title:  Age, spreading rates, and spreading asymmetry of the world's ocean crust
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                  Anchor:  DOI doi:10.1029/2007GC001743
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                individualName:  R. Dietmar Muller
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                individualName:  Maria Sdrolias
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                individualName:  Carmen Gaina
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                individualName:  Walter R. Roest
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                name:  Geochemistry, Geophysics, Geosystems
                issueIdentification:  Volume 9, Issue 4, April 2008
            otherCitationDetails:  DOI:10.1029/2007GC001743
        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.
        purpose:  Scientific Research
        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.
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            otherConstraints:  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.
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        supplementalInformation:  Data from this report are available online from NGDC, and also online from EarthByte Group, University of Sydney. Version 3 (posted 9/25/2008) contains the following changes: 1) Spreading asymmetry for crust without a present day conjugate is included in this version of the grid due to several requests received by the authors.2) Adjustment to the location of chron M25 in the westernmost Pacific (Pacific-Izanagi) and to the age assigned to the Pacific triangle.3) Minor COB modifications around back-arc basins to minimise over-interpolation artifacts from the adjacent subducting ocean floor.4) A gridding artifact in the Bay of Bengal, eastern India and in the southern Indian Ocean, east of the Enderby Basin was fixed.5) Inclusion of the Komandorsky Basin and Bering Sea, North Pacific.
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          RecordType:  digital model of age, age uncertainty, spreading rate, and spreading asymmetries
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            descriptor:  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.
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                aName:  gridded spreading asymmetries
                attributeType:
            descriptor:  Asymmetries in crustal accretion appear to be frequently related to asthenospheric flow from mantle plumes to spreading ridges, resulting in ridge jumps towards hotspots.
            maxValue:
            minValue:
            units:
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    contentInfo:  (MD_FeatureCatalogueDescription)
        complianceCode:  false
        includedWithDataset:  true
        featureTypes:
          LocalName:
        featureCatalogueCitation:  (CI_Citation)
            title:  Documentation
            date:  (CI_Date)
                date:  2008-12-31
                dateType:  (CI_DateTypeCode) creation
            otherCitationDetails:  Entities and attributes are completely described in a text file accompanying the dataset on download.
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    distributionInfo:  (MD_Distribution)
        distributionFormat:  (MD_Format)
            name:  ASCII
            version:  UTF-8
            specification:  American Standard Code for Information Interchange (ASCII) text format.
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                positionName:  Marine Geology Data Manager
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  (303) 497-6339
                        facsimile:  (303) 497-6513
                    address:  (CI_Address)
                        deliveryPoint:  325 Broadway, Mail Code E/GC3
                        city:  Boulder
                        administrativeArea:  CO
                        postalCode:  80305-3328
                        country:  USA
                        electronicMailAddress:  geology.info@noaa.gov
                    hoursOfService:  7:30 - 5:00 Mountain
                role:  (CI_RoleCode) distributor
            distributionOrderProcess:  (MD_StandardOrderProcess)
                fees:  free online download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  251.583
            onLine:  (CI_OnlineResource)
                linkage: http://www.ngdc.noaa.gov/mgg/ocean_age/ocean_age_2008.html
                protocol:  WWW:LINK-1.0-http--link
                applicationProfile:  Web Browser
                name: http://www.ngdc.noaa.gov/mgg/ocean_age/ocean_age_2008.html
                description:  NGDC web page of information about the database including links to full documentation and free data download from NGDC.
                function:  (CI_OnLineFunctionCode) information
            onLine:  (CI_OnlineResource)
                linkage: http://www.earthbyte.org/Resources/agegrid2008.html
                protocol:  WWW:LINK-1.0-http--link
                applicationProfile:  Web Browser
                name: http://www.earthbyte.org/Resources/agegrid2008.html
                description:  Alternate download from the originator.
                function:  (CI_OnLineFunctionCode) download
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) dataset
            extent:  #boundingExtent
            levelDescription:  (MD_ScopeDescription)
                dataset:  gov.noaa.ngdc.mgg.geology:G04150
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Horizontal Positional Accuracy
            measureDescription:
            evaluationMethodDescription:  The horizontal accuracy of data values is unknown.
            result:
        report:  (DQ_QuantitativeAttributeAccuracy)
            nameOfMeasure:  Reliability
            measureDescription:  no quality control measures were performed by NGDC.
            evaluationMethodDescription:  Quality control was performed by the originator.
            result:
        lineage:  (LI_Lineage)
            statement:  Lineage prior to transfer to NGDC is unknown.
            processStep:  (LI_ProcessStep)
                description:  Received data from originator
                dateTime:
                  DateTime:  2008-12-31T00:00:00
            source:  (LI_Source)
                description:  Dietmar Muller
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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) irregular
        dateOfNextUpdate:  2015-05-05
        maintenanceNote:  Metadata Review Date: 2015-05-05
        contact:  (CI_ResponsibleParty)
            individualName:  Carla J. Moore
            organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
            positionName:  Marine Geology Data Manager
            contactInfo:  (CI_Contact)
                phone:  (CI_Telephone)
                    voice:  (303) 497-6339
                    facsimile:  (303) 497-6513
                address:  (CI_Address)
                    deliveryPoint:  325 Broadway, Mail Code E/GC3
                    city:  Boulder
                    administrativeArea:  CO
                    postalCode:  80305-3328
                    country:  USA
                    electronicMailAddress:  geology.info@noaa.gov
                hoursOfService:  7:30 - 5:00 Mountain
            role:  (CI_RoleCode) custodian
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    acquisitionInformation:  (MI_AcquisitionInformation)
        instrument:  (MI_Instrument)
            identifier:  (MD_Identifier)
                code:  In Situ/Laboratory Instruments
            type:  instrument
            description:  Instrument Type: Sea floor and lakebed geologic sampling (coring, drilling, dredging, trawling, and/or grab sampling devices) and/or in situ measurements (cameras, visual observations, and/or recorders/loggers)
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                authority:  (CI_Citation)
                    title:  NASA/Global Change Master Directory (GCMD) Platform Keywords
                    date:  (CI_Date)
                        date:  2008-02-05
                        dateType:  (CI_DateTypeCode) publication
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  NASA
                        positionName:  GCMD User Support Office
                        contactInfo:  (CI_Contact)
                            address:  (CI_Address)
                                electronicMailAddress:  gcmduso@gcmd.gsfc.nasa.gov
                            onlineResource:  (CI_OnlineResource)
                                linkage: http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
                                name:  GCMD Feedback Form
                                description:  Have a Comment for the GCMD?
                                function:  (CI_OnLineFunctionCode) information
                        role:  (CI_RoleCode) custodian
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:
                        contactInfo:  (CI_Contact)
                            onlineResource:  (CI_OnlineResource)
                                linkage: http://gcmd.nasa.gov/learn/keyword_list.html
                                name:  GCMD Keywords Page
                                description:  This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions.
                                function:  (CI_OnLineFunctionCode) information
                        role:  (CI_RoleCode) custodian
                code:  In Situ Ocean-based Platforms > SHIPS
            description:  Various ocean-based and lake-based ships, boats, remotely operated vehicles, submersibles, and other unspecified types of platforms
            instrument: