Saturday

April 19, 2014

April 19, 2014

Posted by **Robin** on Saturday, January 12, 2013 at 7:00pm.

Building Isochrons and Determining the Ages of Three Rocks

Page 15 of 17

For each of the three rocks listed below follow these steps to determine the rock's age of formation.

1. Prepare an isochron by plotting the points that represent the amounts of isotopes Rb-87 and Sr-87. (The values are RATIOS of parent and daughter to the stable isotope, Sr-86. Mass spectrometers measure ratios and not absolute amounts.) Plotting Instructions

2. Click "Verify Points" and then use the "regressor" to find the slope and intercept of the line that Best Fits the points. The process, called "Least Squares," will result in the best value for the slope. Regressor Instructions

3. The age of the rock will be calculated for you. After you minimize the error term, click the "Verify Age" button, and if age is OK, transfer the rock's age to the table on the right. After completing table, click the "Next" button to receive your CERTIFICATE of completion as a Geochronologist.

Sample

Locality

Age (Million years)

Granite Scottish Highlands

Gabbro Sudburry, Canada

Gneiss Greenland

- Geology -
**Anonymous**, Monday, March 11, 2013 at 11:43amgiugyu

- Geology -
**Anonymous**, Monday, March 11, 2013 at 11:44amghj

- Geology -
**Anonymous**, Friday, March 22, 2013 at 10:02pmPlot the point, verify them, it will tell you if they are good, and for the age verificacion is quitte the same.

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