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^ Basic Concepts 2 Aclmowledgements^ Hydrogen^ Reference materials and reporting of isotope ratios5 Ranges in isotopic composition5 Water Silicates^ Hydroxides:^ Organic hydrogen8 Methane 10 Hydrogen gas 10 Lithium^ Reference materials and reporting of isotope ratios 11 Ranges in isotopic composition 11 Marine sources 11 Non-marine sources 13 Lithium in rocks 13 Phosphates 13 Silicates ... .  . .... . .. .. . . .... .  .._ Reagents ..  ... . ... .. ... . . J^ Boron Reference materials and reporting of isotope ratios 15 Ranges in isotopic composition 15 Marine sources 15 Non-marine sources 16 Igneous rocks 19 Metamorphic rocks 19 Sediments^ Organic boron19 Carbon 20 Reference materials and reporting of isotope ratios20 Ranges in isotopic composition20 Carbonate and bicarbonate 20 Carbon dioxide25 Oxalates26 Carbon monoxide26 Organic carbon 26 Elemental carbon28 Ethane 28 Methane 28 Nitrogen Reference materials and reporting of isotope ratios29 Ranges in isotopic composition29 Nitrate Nitrite Nitrogen oxide gases30 Nitrogen gas 30 Organic nitrogen32 Nitrogen in rocks34 Ammonium^ Oxygen  Reference materials and reporting of isotope ratios36 Ranges in isotopic composition37 Oxygen gas39 Water^ Carbon monoxide41 Carbon dioxide 41 Carbonates 41 Nitrogen oxides42 Other Oxides42 Phosphates 42 Silicates Sulfates^ Plants and animals43 Magnesium^ Reference materials and reporting of isotope ratios44 Ranges in isotopic composition44 Marine sources 44 Elemental magnesium46 SiHcon^ Reference materials and reporting of isotope ratios46 Ranges in isotopic composition46 Igneous rocks47 Metamorphic rocks47 Vein quartz and silicified rocks

Compilation of minimum and maximum isotope ratios of selected elements in naturally occurring terrestrial materials and reagents