Proactive disclosure Print version ![Print version Print version](/web/20061103001742im_/http://gsc.nrcan.gc.ca/esst_images/_printversion2.gif) ![ÿ](/web/20061103001742im_/http://gsc.nrcan.gc.ca/esst_images/_spacer.gif) | ![ÿ](/web/20061103001742im_/http://gsc.nrcan.gc.ca/esst_images/_spacer.gif) | ![Geological Survey of Canada Geological Survey of Canada](/web/20061103001742im_/http://gsc.nrcan.gc.ca/esst_images/gsc_e.jpeg) Natural Resources Canada > Earth Sciences Sector > Geological Survey of Canada
Geochronology Laboratory Areas of Research
Themes:
- Timescale/stratigraphic correlations
- Tectonics: orogenic processes, paleotectonic reconstruction
- Paleo-glaciations
- Hazards
- Mineral deposit processes and exploration keys
Examples of Projects:
- Precise emplacement chronology (U-Pb) of the Nain Plutonic Suite
- Rate of lithospheric thinning and precise timescale of the eruption of lavas in the British Tertiary Volcanic Province.
- Ancient Pacific Margin tectonic model correlation (NATMAP)
- Stratigraphic correlation of the Nass River map area
- Rates of UHP and HP metamorphism and exhumation, Western Gneiss Region, Norway
Themes:
- Evolution of the earth's oldest crust (major impact on crust-mantle evolution studies)
- Formation and stabilization of the lower crust (xenoliths, granites as probes)
- Characterization of juvenile vs. reworked crust (tectonic accretion/evolution of orogens)
- Constraining the ages of metamorphism (and uplift/cooling/denudation) in orogenic belts
- Tracer isotopes & lithogeochemistry: crust formation, differentiation, modification
Examples of Projects:
- Isotope geochemical contributions to multidisciplinary studies (often NATMAP)
- Acasta Gneiss/Slave Province: SHRIMP study of the Earth's oldest zircons
- Western Superior, Western Churchill NATMAP Projects
- Trans-Hudson, NE Laurentia (Baffin, Torngat, Nain, Ketilidian)
- Evolution of the Davis Strait using 40Ar-39Ar dating of volcanic rocks
Themes:
- Understanding sedimentary provenance through heavy mineral dating studies (principally U-Pb, zircon ± monazite); distribution of ages
- Fingerprinting sediments for correlation purposes (assessing source contributions)
- Maximum age of deposition
- Timing of tectonic accretion in orogenic terranes
- Age spectra can be used as a way of 'imaging' eroding basement at time of deposition
- Detrital zircons may be the only way of assessing basement which is no longer exposed
Examples of Projects:
- U-Pb detrital zircon study of turbidites in the Slave Province
- U-Pb study of polycyclic detrital zircons, Late Paleozoic St. Marys Basin, Nova Scotia
- Clastic and sedimentary sequences of the Woodburn Lake Group
- U-Pb detrital zircon ages and the provenance of the Torridonian sandstones of NW Scotland
- Paleoproterozoic basins of the Canadian Shield (Shaler, Hurwitz, Baker Lake)
- Pan-continental river system draining of the Grenville orogen
Themes:
- Natural link between geological and environmental applications of isotope geochemistry
- Unique ability to provide high-precision isotopic ratios
- Pb and Sr isotopic ratios in lake sediments, water, organic tissue, bone, teeth
- Interpretation of data to identify natural vs. anthropogenic components, delineate environmental pathways of contaminants
Examples of Projects:
- Sr isotopic composition of modern walrus teeth from Hudson Bay and Arctic Islands
- Pb isotopic database
- Stable lead isotope characteristics of lead ore deposits
Themes:
- Expanding capabilities
- Lower analytical uncertainties
- Increased efficiencies
- Improved interpretations
Examples of Projects:
- Pb and Sr column chemistry for organic matrices
- Ar-Ar analysis of Neogene volcanics
- Intercalibration of Ar-Ar and U-Pb isotopic systems
- International Ar-Ar standard
- New SHRIMP zircon U-Pb and trace element standards
- SHRIMP zircon U-Pb calibration methods
- New cathode design SHRIMP zircon REEs, Sr isotopes
- Alunite Ar-Ar
- Chemistry of altered zircon
- Section project database
- SHRIMP data reduction
|