gov.noaa.ngdc.mgg.geology:G04150 eng; USA utf8 dataset Carla J. Moore DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (303) 497-6339 (303) 497-6338 (303) 497-6513 NOAA/NESDIS/NGDC 325 Broadway Boulder CO 80305-3328 USA geology.info@noaa.gov 7:30 - 5:00 Mountain Contact Data Center pointOfContact 2012-09-14 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) point European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group http://www.epsg-registry.org/ European Petroleum Survey Group registry European Petroleum Survey Group registry information urn:ogc:def:crs:EPSG:4326 6.18.3 Age, spreading rates, and spreading asymmetry of the world's ocean crust 2008 publication 1 Downloadable Data Dr. Dietmar Muller, EarthByte Group, School of Geosciences, University of Sydney, Australia originator tableDigital Geochemistry, Geophysics, Geosystems 9 DOI:10.1029/2007GC001743 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. Scientific Research 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. completed Carla J. Moore DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (303) 497-6339 (303) 497-6338 (303) 497-6513 NOAA/NESDIS/NGDC 325 Broadway Boulder CO 80305-3328 USA geology.info@noaa.gov 7:30 - 5:00 Mountain Contact Data Center pointOfContact notPlanned http://www.ngdc.noaa.gov/mgg/ocean_age/data/2008/image/age_ortho_small.gif crustal ages GIF Unknown project NASA/GCMD Earth Project Keywords EARTH SCIENCE > OCEANS > Marine Geophysics > Marine Magnetics EARTH SCIENCE > SOLID EARTH > Rocks/Minerals > Age Determinations EARTH SCIENCE > SOLID EARTH > Geomagnetism > Paleomagnetism theme NASA/GCMD Earth Science Keywords OCEAN PLATFORMS SHIPS > SHIPS platform NASA/GCMD Platform Keywords Unknown instrument NASA/GCMD Instrument Keywords INFOTERRA > Subject disciplines > Geology > Geology INFOTERRA > Subject disciplines > Marine geology > Marine geology theme INFOTERRA Keyword Thesaurus WDC/MGG, BOULDER > World Data Center for Marine Geology and Geophysics, Boulder DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce dataCenter NASA/GCMD Data Center Keywords Solid Earth > Crust Geographic Region > Global Ocean Vertical Location > Sea Floor place NASA/GCMD Location Keywords Please cite the original source when using these data. Disclaimer - 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. eng; USA UTF8 geoscientificInformation oceans Native Dataset Environment: ASCII text Global sea floor -180.0 180.0 -90.0 90.0 Publication Date 2008-12-31 2008-12-31 -10000 0 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. false true Documentation 1984 creation Entities and attributes are completely described in a text file accompanying the dataset on download. ASCII Carla J. Moore DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (303) 497-6339 (303) 497-6338 (303) 497-6513 NOAA/NESDIS/NGDC 325 Broadway Boulder CO 80305-3328 USA geology.info@noaa.gov 7:30 - 5:00 Mountain Contact Data Center distributor free online download 251.583 http://www.ngdc.noaa.gov/mgg/ocean_age/ocean_age_2008.html WWW:LINK-1.0-http--link Web Browser dataset information page Web page of information about the database including links to full documentation and free data download from NGDC. information http://www.earthbyte.org/Resources/agegrid2008.html WWW:LINK-1.0-http--link Web Browser G04150 data download Alternate download from the originator. download dataset gov.noaa.ngdc.mgg.geology:G04150 Horizontal Positional Accuracy The horizontal accuracy of data values is unknown. Reliability no quality control measures were performed by NGDC. Quality control was performed by the originator. Lineage prior to transfer to NGDC is unknown. Received data from originator 2008-12-31T00:00:00 Peter Woodbury Deep Sea Drilling Project 2013-09-14 This metadata was automatically generated from the Content Standards for Digital Geospatial Metadata standard version FGDC-STD-001-1998 using the April 19th, 2011 version of the FGDC RSE to ISO 19115-2 transform. The record was hand edited on 2011-08-30 to include elements not created during the transformation. Carla J. Moore DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (303) 497-6339 (303) 497-6338 (303) 497-6513 NOAA/NESDIS/NGDC 325 Broadway Boulder CO 80305-3328 USA geology.info@noaa.gov 7:30 - 5:00 Mountain Contact Data Center custodian various Data were compiled from a variety of sources and instruments. NASA/Global Change Master Directory (GCMD) Platform Keywords 2008-02-05 publication NASA Global Change Master Directory (GCMD) User Support Office NASA Global Change Master Directory, Goddard Space Flight Center Greenbelt MD 20771 USA gcmduso@gcmd.gsfc.nasa.gov http://gcmd.nasa.gov/index.html http web browser NASA Global Change Master Directory (GCMD) Home Page information http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso custodian NASA Global Change Master Directory (GCMD) NASA Global Change Master Directory, Goddard Space Flight Center Greenbelt MD 20771 USA gcmduso@gcmd.gsfc.nasa.gov http://gcmd.nasa.gov/Resources/valids/ http web browser NASA Global Change Master Directory (GCMD) Keyword Page This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. download http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso custodian SHIPS > SHIPS Data were collected by Ships and other sources.