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.
- Cite as: Muller, R.D.; Sdrolias, M.; Gaina, C.; Roest, W.R.; 2008: Age, spreading rates, and spreading asymmetry of the world's ocean crust. NOAA National Centers for Environmental Information. https://doi.org/10.1029/2007GC001743. Accessed [date].
- doi:10.1029/2007GC001743
- NCEI Metadata ID: gov.noaa.ngdc.mgg.geology:G04150
gov.noaa.ngdc.mgg.geology:G04150
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | Marine Geology Data Manager NOAA National Centers for Environmental Information geology.info@noaa.gov |
Coverage Description | Global sea floor |
Time Period | 2008-12-31 to 2008-12-31 |
Spatial Reference System | urn:ogc:def:crs:EPSG:4326 |
Spatial Bounding Box Coordinates |
West:-180.0
East:180.0
South:-90.0
North:90.0
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Spatial Coverage Map |
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Edition | 1 |
Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed,
especially in columns |
Dataset Progress Status | ongoing Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | Unknown - New versions may be archived in the future. |
Supplemental Information |
Data from this report are available online from NCEI, 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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Purpose | Scientific Research |
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Theme keywords | Library of Congress Subject Headings
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Platform keywords | Global Change Master Directory (GCMD) Platform Keywords
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Instrument keywords | Global Change Master Directory (GCMD) Instrument Keywords
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Place keywords | Global Change Master Directory (GCMD) Location Keywords
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Other Constraints | Cite as: Muller, R.D.; Sdrolias, M.; Gaina, C.; Roest, W.R.; 2008: Age, spreading rates, and spreading asymmetry of the world's ocean crust. NOAA National Centers for Environmental Information. https://doi.org/10.1029/2007GC001743. Accessed [date]. |
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Lineage Statement | lineage prior to transfer to NCEI is unknown. |
Processing Environment | Native Dataset Environment: ASCII text |
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Last Modified: 2020-04-21
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