This book provides a comprehensive introduction to radiogenic and stable isotope geochemistry. Beginning with a brief overview of nuclear physics and nuclear origins, it then reviews radioactive decay schemes and their use in geochronology. A following chapter covers the closely related techniques such as fissionatrack and carbona14 dating. Subsequent chapters cover nucleosynthetic anomalies in meteorites and early solar system chronology and the use of radiogenic isotopes in understanding the evolution of the Earth s mantle, crust, and oceans. Attention then turns to stable isotopes and after reviewing the basic principles involved, the book explores their use in topics as diverse as mantle evolution, archeology and paleontology, ore formation, and, particularly, paleoclimatology. A following chapter explores recent developments including unconventional stable isotopes, massaindependent fractionation, and isotopic clumping . The final chapter reviews the isotopic variation in the noble gases, which result from both radioactive decay and chemical fractionations.NOBLE GAS ISOTOPE GEOCHEMISTRY 439 continental crust and assuming a mean K/Ar age of the crust of 1 Ga, we can ... then the 40Ar flux from oceanic crust creation is 2.17 A 107moleayr (essentially all 4He and 40Ar in MORB is radiogenic). ... 1018 moles of 40Ar, depending on which value of K concentration we use for the bulk silicate Earth (190 vs 240ppm). ... In this case, there is no easy way to estimate the 36Ar content of the bulk silicate Earth, but we do know how muchanbsp;...
|Author||:||William M. White|
|Publisher||:||John Wiley & Sons - 2015-01-27|