Radioactive Decay and Geochronology
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This page first made public: May 3, 2006
- To convey concepts necessary in modeling a system involving exponential growth and decay
- To introduce elementary differential equations
- To convey the difference between closed and open systems
- To introduce if-then-else logical statements
- To convey the importance of secular equilibrium, which allows complex isotopic decay systems to be modeled without taking into consideration radioactive daughters.
- To explore concordia-discordia diagrams and how a rock containing two isotopic systems can yield both the age of original crystallization and the time of a later metamorphic event.
Context for Use
Teaching Notes and Tips
Documented_Isotope_Model.stm ( 25kB Jun13 05)
Documented_UPb_Model.v.1.STM ( 589kB Jun13 05)
Documented_UPb_Model.v.2.stm ( 705kB Jun13 05)
PBLOSS.F90 ( 4kB Jun13 05)
U_series.f90 ( 4kB Jun13 05)
fortran_radioactive_decay.pdf (Acrobat (PDF) 8kB Jun13 05)
assignment_assessment_2.pdf (Acrobat (PDF) 5kB Jun13 05)
References and Resources
- Dalrymple, G.B., 1991, The Age of the Earth, Stanford, CA: Stanford University Press, p. 79-90, 99-102, 115-119, and 122-124.
- Faure, G., 1986, Principles of Isotope Geology, 2nd Edition, New York: John Wiley and Sons, p. 38-45 and p. 283-296.
Contact the Author
Controlled Vocabulary Terms
Resource Type: Activities:Lab Activity, Computer Applications
Special Interest: Data, models, or simulations:Models, Quantitative, Data, models, or simulations:Data, Computer-Based
Grade Level: College Upper (15-16)
Quantitative Skills: Models and Modeling
Ready for Use: Ready to Use
Topics: Time/Earth History, Solid Earth:Geochemistry:Radioisotopes