13C/12C ratios of rocks and inclusions in popping rocks of the Mid-Atlantic Ridge and their bearing on the problem of isotopic composition of deep-seated carbon |
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| Authors: | F Pineau M Javoy Y Bottinga |
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| Institution: | 1. Laboratoire de Ge´ochimie et Cosmochimie, De´partement des Sciences de la Terre, Universite´de Paris VII, Paris France;2. Institut de Physique du Globe, Universite´de Paris VI, Paris France |
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| Abstract: | CO2-rich inclusions recovered from “popping” and related tholeiitic rocks from the Mid-Atlantic Ridge have δ13C values of ?7.6 ± 0.5%. relative to PDB. δ13C values of total carbon in the same rocks range from ?12 to ?13.7‰. These values are discussed in the light of the known δ13C variations in rocks of deep-seated origin. The ?7.6‰ value is interpreted as a reasonable estimate of the primary value of δ13C of deep-seated carbon in the ridge area. |
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