Cosmogenic dating group

The projects and publications listed elsewhere on this website provide further information.

I've long been involved in chasing down the details of cosmogenic nuclide production, both at the surface and deep below ground.

It is most useful for rocks which have been exposed for between 10 years and 30,000,000 years.

The most common of these dating techniques is Cosmogenic radionuclide dating.

For the last few years I've been an active participant in the CRONUS-Earth project, an NSF-sponsored effort to do just that.

Our CRONUS page contains more information and useful data from the project.

By sampling the rocks and separating certain minerals (such as quartz or pyroxene) and calculating the amount of these minerals (as a ratio to other, stable, minerals), we can work out how long the rock has been exposed on the earth’s surface.

My Ph D research was on the geochemistry of helium and the other noble gases, followed by brief stints working on lunar soils and isotopically unusual, pre-solar grains in meteorites.

Surface exposure dating is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth's surface.

Surface exposure dating is used to date glacial advances and retreats, erosion history, lava flows, meteorite impacts, rock slides, fault scarps, and other geological events.

| Using cosmogenic nuclides in glacial geology | Sampling strategies cosmogenic nuclide dating | Difficulties in cosmogenic nuclide dating | Calculating an exposure age | Further Reading | References | Comments | Cosmogenic nuclide dating can be used to determine rates of ice-sheet thinning and recession, the ages of moraines, and the age of glacially eroded bedrock surfaces.

Cosmogenic nuclide dating uses the interactions between cosmic rays and nuclides in glacially transported boulders or glacially eroded bedrock to provide age estimates for rock at the Earth’s surface.

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