PPT-Lead Isotope Geochemistry:

A Brave New World Graham R Carr CSIRO Exploration and Mining June 2013 Outline Traditional Use of Pb Isotopes in Metallogenic Studies Exploration Geochemistry General Principles Gossans and Residual Soils. Chapter 6. Isotope Geochemistry. In isotope geochemistry, our primary interest is not in dating, but using the time-dependent nature of isotope ratios to make inferences about the nature of reservoirs in the Earth and their evolution.. Geochemistry?. Geo (geology, . gaia. ) + chemistry. A field of study dealing geological phenomena and problems with chemical tools and principles. Prerequisites?. Physical geology, . minerlaogy. , petrology, economic geology. Lecture 31 . Mass Dependent Fractionation. . If . a 4‰ fractionation of . δ. 18. O . is observed in a particular sample, what value of . δ. 17. O . do we predict? . We might guess it would ½ as much. . Stable isotopes are used in CCS to look for leakage of CO2 into overlying aquifers or into the surface environment. What are Stable Isotopes. These are isotope that do not decay over time as the radiogenic isotope do.. Lecture 32 . The Antarctic Ice Record. Much subsequent . paleoclimate. effort has focused on . δD. in ice cores from Antarctica and Greenland.. The . Vostok. core from Antarctica went back 400 . ka. Lecture 30 . Beginnings. Stable isotope geochemistry is concerned with variations in the isotopic compositions of elements arising . small . differences in the chemical behavior of different isotopes of an . Lecture 39. U & Th Decay Series . Isotopes. continued. U and . Th. Decay Series. Decay Series and Radioactive Equilibrium. 238. U, . 235. U, and . 232. Th decay to Pb through a series of α . decays (8, 7, and 6, respectively). . Bedtime stories for STEM. By Tom. TALE #1. What dating was like before Match.com. CARBON 14. Carbon 14 dating. Only valid on remains of living organisms. Rarely used for time >BP 20,000 years. C14 CORRECTIONS. Lecture 33 . Stable Isotopes in the Hydrosphere and Biosphere. Isotopic Fractionation in the Hydrosphere. δ. 18. O in the oceans is nearly constant at 0. However, as a consequence of Rayleigh fractionation and temperature dependence of the water-vapor fractionation factor, the isotopic composition of precipitation varies widely.. FIGURE 01: Simple Bohr-type model of a lithium atom. Radioactive Isotopes. Unstable isotopes decay to other nuclides. The rate of decay is constant, and not affected by P, T, X…. Parent. nuclide = . COMMON plumeswere initially thought to consist of primitive mantle (e.g., Schilling, 1973). As we found, mixing be-tween primitive and depleted mantle can explain the Sr and Nd isotopic compositions A potential new access to neutrons.  . Yong. . Joong. LEE (ESS). Mikael Jensen.  . (DTU-NUTECH). April 30, 2019. Kick-off Meeting on New H2020 Project, . Erice. , . Italy. Mission Statement: ESS Radioisotope Production Station. Lecture . 29. Isochrons. This equation has the form . y = a + bx. .. Plotting the radiogenic isotope ratio against the parent daughter ratio, the intercept with be . R. 0. . and the slope will be . e. Adrian Boyce, Tony . Fallick. . and . Gary Mullen. Drew Drummond and Aileen Doran*. Scottish Universities Environmental Research Centre (SUERC), East . Kilbride. , Glasgow, Scotland, UK. Mogul – .