Teaching with the EarthChem Geochemical Database
Integrating Research and Education > EarthChem > Useful Databases and Tools

Useful Databases and Tools

Resources at EarthChem.org

GEOROC: Geochemistry of Rocks of the Oceans and Continents (more info)

Focus
  • compositions of igneous materials from convergent margins, oceanic islands, and large igneous provinces
Geographic coverage
  • global (oceans and continents)
Tectonic settings
  • oceanic islands
  • seamounts
  • oceanic plateaus
  • submarine ridges
  • ocean basin flood basalts
  • continental flood basalts
  • convergent margins (arcs)
Earth materials
  • volcanic igneous rocks
  • plutonic igneous rocks
  • mantle xenoliths
  • volcanic glasses
  • metamorphic rocks (not emphasized)
  • sedimentary rocks (not emphasized)
  • minerals (from rocks and veins)
  • inclusions (glass, mineral, and fluid)
Strengths
  • data is easily searchable by tectonic setting, geographic region, igneous province, and in many cases volcanic field or igneous suite
  • lots of precompiled datasets arranged by tectonic setting, geographic location, and rocktype
Limitations
  • age data is only included if it is mentioned in the original reference, hence the number of samples with quantitiative age information is lacking
  • the tabulated isotopic compositions are of limited use because of the lack of age information (e.g., initial isotopic ratios are not available)
Downloading options
  • Excel-compatible comma-separated textfiles
  • HTML files

PETDB: Petrological Database of the Ocean Floor (more info)

Focus
  • compositions of igneous materials from the ocean floor
Geographic coverage
  • global (ocean floor)
Tectonic settings
  • abyssal hills
  • aseismic ridges
  • back-arc basins
  • failed rifts
  • forearc basins
  • fossil ridges
  • fracture zones
  • incipient rifts
  • oceanic plateaus
  • oceanic islands
  • off-axis spreading centers
  • old oceanic crust
  • seamounts
  • spreading centers
  • trenches
  • triple junctions
Earth materials
  • volcanic igneous rocks
  • plutonic igneous rocks
  • volcanic glasses
  • mantle xenoliths
  • metamorphic rocks (not emphasized)
  • minerals
  • glass inclusions
Strengths
  • data is easily searchable by tectonic setting, geographic region, and in some cases igneous suite
  • precompiled datasets include global rock data grouped by chemical element, and MORB data grouped by region
Limitations
  • the database is mainly limited to samples of approximately zero age
Downloading options
  • Excel-compatible comma-separated textfiles (.csv format)
  • HTML files

NAVDAT: The Western North American Volcanic and Intrusive Rock Database (more info)

Focus
  • ages and compositions of Cenozoic igneous rocks from western North America
Geographic coverage
  • western U.S., western Mexico, and British Columbia
Earth materials
  • volcanic igneous rocks
  • plutonic igneous rocks
Strengths
  • every sample is accompanied by quantitative age data. This makes it ideal for examining and plotting space-time-composition trends
  • contains an automated feature that generates maps
Limitations
  • not easily searchable by tectonic setting, geographic regions smaller than states or provinces, or by igneous province or suite
  • no precompiled files other than those obtained from queries (not really a problem, though)
Downloading options
  • Excel-compatible tab-delimited textfiles
  • HTML tables
  • maps of sample locations
  • major element variation ("Harker") diagrams
  • total alkali vs. silica (TAS) diagrams (used for rock classification)
  • geology, elevation, gravity, and magnetic GIS coverages for western states

Other Resources

EarthRef: Website for Physical and Chemical Earth References (more info)

MELTS Home Page (more info)

Geochemistry of Igneous Rocks (more info)


« Previous Page      Next Page »