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carbon isotope ratio

   Also found in: Acronyms 0.01 sec.
carbon isotope ratio [¦kar·bən ′is·ə‚tōp ‚rā·shō]
(geology)
Ratio of carbon-12 to either of the less common isotopes, carbon-13 or carbon-14, or the reciprocal of one of these ratios; if not specified, the ratio refers to carbon-12/carbon-13. Also known as carbon ratio.


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They analyzed pollen from a marine core in the Bay of Bengal that included a layer of ash from the Toba eruption, and they looked at carbon isotope ratios in fossil soil carbonates taken from directly above and below the Toba ash in three locations in central India.
Stable oxygen and carbon isotope ratio analysis in scallops from four large beds (Uruguay, 36[degrees]17'S, Reclutas, 39[degrees]20'S, Tango B, 42[degrees]30'S, and Beagle, 55[degrees]10'S) in combination with condition indexes and oceanography date strongly suggest that shell growth increments in this species are formed annually.
Carbon isotope ratios,mineral concentrations,and rock deformations were similar to those seen in Yucatan.
 
 
 
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