"Recycled" volatiles in mantle-derived diamonds - Evidence from nitrogen and noble gas isotopic data
Date
2006
Authors
Mohapatra, R.K.
Honda, Masahiko
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Elsevier
Abstract
Noble gas isotopic data from diamonds are commonly interpreted as a two component mixture of gases from the mantle source of mid oceanic ridge basalt (MORB) and air. The air-like component in diamonds is generally considered to have been acquired secondarily through atmospheric contamination. In a recent study [C. Gautheron, P. Cartigny, M. Moreira, J.W. Harris, C.J. Allègre, Evidence for a mantle component shown by rare gases, C and N isotopes in polycrystalline diamonds from Orapa (Botswana), Earth Planet. Sci. Lett. 240(2005) 559-572.] that involved analyses of noble gases, carbon and nitrogen, such interpretation based on noble gases is used to constrain the sources of carbon and nitrogen in diamond to be solely from the mantle. With the help of heavy noble gas and nitrogen isotopic data from diamonds, we show here that the air-like noble gas component in diamonds is actually a mixture of contributions derived from recycled materials and (minor) air contamination. This, in turn, suggests that some of the carbon in diamonds may also have a recycled origin.
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Keywords: Air contamination; Mid oceanic ridge basalt; Recycled materials; Carbon; Inert gases; Isotopes; Nitrogen; Diamonds; carbon isotope; diamond; mid-ocean ridge basalt; nitrogen isotope; noble gas; Africa; Botswana; Orapa; Southern Africa; Sub-Saharan Africa carbon; diamond; nitrogen; noble gases; recycled materials
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Earth and Planetary Science Letters
Type
Journal article
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2037-12-31
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