Step-by-step instructions

The instructions for this exercise have 5 main parts. Click each part name to see the steps in that part.

Part 1 - Download the data

Use the NAVDAT database to download and save isotopic data from young mafic volcanic rocks from the western United States.

Part 2 - Test the age correction

Test the assumption that age-correcting the 87Sr/86Sr data is not necessary for young volcanic rocks.

Part 3 - Analyze the data

Use the plotting and mapping tools on the NAVDAT website to analyze the data downloaded from NAVDAT.

Part 4 - Interpret the data

Interpret the spatial and isotopic variations on your maps and graphs.

Part 5 - Wrap-up

Summarize what you have discovered about mantle sources of mafic magmas in the western U.S.