I. The Geochemistry of Rubidium and Strontium.- 1. Introduction.- 2. Rubidium.- 3. Strontium.- 4. The Rubidium/Strontium Ratio.- 5. Summary.- II. Measurement of Geologic Time by the Rubidium-Strontium Method.- 1. Introduction.- 2. Radioactive Decay of 87Rb to 87Sr.- 3. The Half-life of 87Rb.- 4. The Growth of Radiogenic 87Sr in Rocks and Minerals.- 5. The Rubidium-Strontium Isochron Method of Dating.- 6. A Useful Approximation.- 7. Analytical Methods.- 8. Summary.- III. Uses of Strontium Isotopes in Petrogenesis.- 1. Introduction.- 2. Evolution of Strontium in the Continental Crust and the Upper Mantle.- 3. Applications to Petrology.- 4. Summary.- IV. Volcanic Rocks.- 1. Introduction.- 2. The Strontium Isotopic Data for Volcanic Rocks.- 3. Variations in the Initial 87Sr/86Sr Ratio among and within Geologic Provinces.- 4. Possible Causes of Variations in Isotopic Composition among Cogenetic Rocks.- 5. Summary.- V. Granitic Rocks.- 1. Introduction.- 2. The Granite Problem.- 3. Observed Initial 87Sr/86Sr Ratios of Granitic Rocks.- 4. Interpretation and Discussion of Initial 87Sr/86Sr Ratios of Granites.- 5. Summary.- VI. Alkalic Rocks and Carbonatites.- 1. Introduction.- 2. Carbonatites.- 3. Alkalic Rocks.- 4. Summary.- VII. Ultramafic and Related Rocks.- 1. Introduction.- 2. 87Sr/86Sr Ratios of Ultramafic Rocks.- 3. Summary.- VIII. Sedimentary Rocks and the Oceans.- 1. Introduction.- 2. Marine Carbonate Rocks and the Oceans.- 3. Marine Evaporites.- 4. Dating of Detrital Sedimentary Rocks.- 5. Glauconite.- 6. Nonmarine Carbonate Rocks.- 7. Summary.- IX. Isotopic Homogenization of Strontium in Open Systems.- 1. Introduction.- 2. Contact Metamorphism.- 3. Regional Metamorphism.- 4. Open-System Behavior of Total-Rock Samples.- 5. Chemical Weathering.- 6. Summary.- X. Meteorites.- 1. Introduction.- 2. Rubidium and Strontium in Stony Meteorites.- 3. The Ages of Stony and Iron Meteorites.- 4. The Initial 87Sr/86Sr Ratios of Stony Meteorites.- 5. Summary.- XI. The Moon.- 1. Introduction.- 2. Lunar Basalt.- 3. Initial 87Sr/86Sr Ratios.- 4. Luny Rock 1 and Sample 12013.- 5. The Soil.- 6. Luna 16.- 7. Summary.- XII. The Evolution of the Isotopic Composition of Terrestrial Strontium.- 1. Introduction.- 2. Evolution of Strontium in the Mantle.- 3. Initial 87Sr/86Sr Ratios of Gabbro and Basalt.- 4. Continental Growth.- 5. Summary.- References for Appendix.- Author Index.
