PPT-Geochronology I

Chapter 2 K Ar RbSr SmNd LuHf and ReOs Figure 21 Decay Systems Geochronologists have a variety of decay systems to work with Each is in some ways unique Success in dating depends on . Chapter 3. U-Th-Pb. Three radionuclides decaying to 3 isotopes of Pb at different rates:. 232. Th decays to . 208. Pb with a half-life of 14 Ga.. 238. U decays to . 206. Pb with a half-life of 4.47 Ga.. . Chapter 4. Table 4.1. Data on Cosmogenic Nuclides. Nuclide Half-life, . yrs. . . λ. , . yr. -1. . . 14. C . 5730. . 1.21 x . 10. -3. . 3. H . 12.33. . 5.62 . x 10. -2. . 10. Be 1.50 . Geochronology Graduate Student Award Program. A new . EarthScope. educational project recommended for funding. . PIs: Becky Flowers (CU), . Jim . Metcalf (CU), . Ramon . Arrowsmith. (ASU), Blair . Episyenites. in Southern New Mexico. By Adam Smith. Episyenites. Hypothesis: . Episyenites result of fenitization from fluids related to . Cambro. -Ordovician alkaline magmatism . 525-457 . Ma in . NM and CO. chronostratigraphy. . . A major goal is the development of the . geochronological. techniques necessary to produce temporal constraints with uncertainties ≤ 0.1 percent of the . radioisotopic. ages. . Recall the four forces of contemporary physical theory; we have, so-far, explored the geophysics of only two. Now lets look at the two remaining:. Weak:. mediates. . β. -decay and . β. -capture processes. )! – observations on ion microprobe geochronology using a high-brightness oxygen plasma source. .. Martin J. Whitehouse & Heejin Jeon. Swedish Museum of Natural History, Stockholm, Sweden, martin.whitehouse@nrm.se.