Diamond crystals may contain useful geochemical evidence of the deep portions of the upper mantle in their carbon isotopes. Two recent studies of types I and II diamonds showed that variations in δ13C may be related to carbon reservoir sources in the mantle (Nature, 303, 791–792, and 793–795, 1983).
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Changes to Carbon Isotopes in Atmospheric CO2 Over the Industrial Era and Into the Future. [PDF]
Graven H, Keeling RF, Rogelj J.
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Dynamic tracking of breastfeeding and weaning in carbon isotopes of tooth enamel. [PDF]
Kimura Y +6 more
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Characterizing Particulate Organic Carbon Isotopes from Typical Emission Sources and Ambient Air in Beijing. [PDF]
Zhao X +9 more
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Tracing CO2 sources in urban and rural areas characterized by different land-use patterns using carbon isotopes. [PDF]
Jeong EK +5 more
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Correction: Expansion of forest cover and coeval shifts in Later Stone Age land-use at Taforalt and Rhafas Caves, Morocco, as inferred from carbon isotopes in ungulate tooth enamel. [PDF]
Worthey KB +7 more
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Amino acid stable carbon isotopes in nail keratin illuminate breastfeeding and weaning practices of mother - infant dyads. [PDF]
Salahuddin H +2 more
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Expansion of forest cover and coeval shifts in Later Stone Age land-use at Taforalt and Rhafas Caves, Morocco, as inferred from carbon isotopes in ungulate tooth enamel. [PDF]
Worthey KB +7 more
europepmc +1 more source

