Age, spreading rates, and spreading asymmetry of the world's ocean crust
Age, spreading rates, and spreading asymmetry of the world's ocean crust
Metadata from the NOAA Metadata Manager and Repository (NMMR)
- Identification Information:
-
- Dataset Identifier:
- gov.noaa.ngdc:G04150
- Citation:
-
- Citation Information:
-
- Originator:
- Dr. Dietmar Muller, EarthByte Group, School of Geosciences, University of Sydney, Australia
- Publication Date:
- 2008
- Title:
- Age, spreading rates, and spreading asymmetry of the world's ocean crust
- Edition:
- 1
- Geospatial Data Presentation Form:
- Tabular Digital Data
- Series Information:
-
- Series Name:
- Geochemistry, Geophysics, Geosystems
- Issue Identification:
- 9
- Publication Information:
-
- Publication Place:
- USA
- Publisher:
- American Geophysical Union and the Geochemical Society
- Other Citation Details:
- DOI:10.1029/2007GC001743
- Citation Identifier:
- 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.
- Description:
-
- 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
- Supplemental Information:
- 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.
- Time Period of Content:
-
- Time Period Information:
-
- Single Date/Time:
-
- Calendar Date:
- 2008
- Currentness Reference:
- publication date
- Status:
-
- Progress:
- Complete
- Maintenance and Update Frequency:
- None planned
- Spatial Domain:
-
- Bounding Coordinates:
-
- West Bounding Coordinate:
- -180.0
- East Bounding Coordinate:
- 180.0
- North Bounding Coordinate:
- 90.0
- South Bounding Coordinate:
- -90.0
- Keywords:
-
- Theme:
-
- Theme Keyword Thesaurus:
- NASA/GCMD Earth Science Keywords
- Theme Keyword:
- Earth Science > Solid Earth > Geomagnetism > Paleomagnetism
- Theme:
-
- Theme Keyword Thesaurus:
- ISO 19115 Topic Category
- Theme Keyword:
- geoscientificInformation
- Theme Keyword:
- oceans
- Place:
-
- Place Keyword Thesaurus:
- NASA/GCMD Location Keywords
- Place Keyword:
- Global Ocean
- Access Constraints:
- please cite source when using these data
- Use Constraints:
- None
- Point of Contact:
-
- Contact Information:
-
- Contact Organization Primary:
-
- Contact Organization:
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
- Contact Person:
- Carla J. Moore
- Contact Address:
-
- Address Type:
- Mailing and Physical Address
- Address:
- NOAA/NESDIS/NGDC 325 Broadway
- City:
- Boulder
- State or Province:
- CO
- Postal Code:
- 80305-3328
- Country:
- USA
- Contact Voice Telephone:
- (303) 497-6339
- Contact TDD/TTY Telephone:
- (303) 497-6958
- Contact Facsimile Telephone:
- (303) 497-6513
- Contact Electronic Mail Address:
- Carla.J.Moore@noaa.gov
- Hours of Service:
- 7:30 - 5:00 Mountain
- Contact Instructions:
- Contact Data Center
- Browse Graphic:
-
- Browse Graphic File Name:
-
http://www.ngdc.noaa.gov/mgg/ocean_age/data/2008/image/age_ortho_small.gif
- Browse Graphic File Description:
- crustal ages
- Browse Graphic File Type:
- GIF
- Data Set Credit:
- 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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- Distribution Information:
-
- Distributor:
-
- Contact Information:
-
- Contact Organization Primary:
-
- Contact Organization:
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
- Contact Person:
- Carla J. Moore
- Contact Address:
-
- Address Type:
- Mailing and Physical Address
- Address:
- NOAA/NESDIS/NGDC 325 Broadway
- City:
- Boulder
- State or Province:
- CO
- Postal Code:
- 80305-3328
- Country:
- USA
- Contact Voice Telephone:
- (303) 497-6339
- Contact TDD/TTY Telephone:
- (303) 497-6958
- Contact Facsimile Telephone:
- (303) 497-6513
- Contact Electronic Mail Address:
- Carla.J.Moore@noaa.gov
- Hours of Service:
- 7:30 - 5:00 Mountain
- Contact Instructions:
- Contact Data Center
- Resource Description:
- Downloadable Data
- Distribution Liability:
-
While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
- Standard Order Process:
-
- Digital Form:
-
- Digital Transfer Information:
-
- Format Name:
- ASCII
- Transfer Size:
- 251.583
- Digital Transfer Option:
-
- Online Option:
-
- Computer Contact Information:
-
- Network Address:
-
- Network Resource Name:
-
http://www.ngdc.noaa.gov/mgg/ocean_age/ocean_age_2008.html
- Network Resource Name:
-
http://www.earthbyte.org/Resources/agegrid2008.html
- Fees:
- none
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- Metadata Reference Information:
-
- Metadata Date:
- 20090403
- Metadata Contact:
-
- Contact Information:
-
- Contact Organization Primary:
-
- Contact Organization:
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
- Contact Person:
- Carla J. Moore
- Contact Address:
-
- Address Type:
- Mailing and Physical Address
- Address:
- NOAA/NESDIS/NGDC 325 Broadway
- City:
- Boulder
- State or Province:
- CO
- Postal Code:
- 80305-3328
- Country:
- USA
- Contact Voice Telephone:
- (303) 497-6339
- Contact TDD/TTY Telephone:
- (303) 497-6958
- Contact Facsimile Telephone:
- (303) 497-6513
- Contact Electronic Mail Address:
- Carla.J.Moore@noaa.gov
- Hours of Service:
- 7:30 - 5:00 Mountain
- Contact Instructions:
- Contact Data Center
- Metadata Standard Name:
- FGDC-STD-001-1998
- Metadata Standard Version:
- 2.0
- Metadata Extensions:
-
- Online Linkage:
-
http://www.ngdc.noaa.gov/metadata/extensions/local_extensions.html
- Profile Name:
- NGDC Extensions to FGDC Metadata
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