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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2016  >  38(6): 828-835
Li Xiaoning, Huang Sijing, Huang Keke, Zhong Yijiang, Hu Zuowei. Differences and controls of carbon and oxygen isotope composition in dolomite and coexisting calcite under deposition conditions[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(6): 828-835. doi: 10.11781/sysydz201606828
Citation: Li Xiaoning, Huang Sijing, Huang Keke, Zhong Yijiang, Hu Zuowei. Differences and controls of carbon and oxygen isotope composition in dolomite and coexisting calcite under deposition conditions[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(6): 828-835. doi: 10.11781/sysydz201606828
shu

Differences and controls of carbon and oxygen isotope composition in dolomite and coexisting calcite under deposition conditions

doi: 10.11781/sysydz201606828

  • State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • Received Date: 2016-02-06
  • Rev Recd Date: 2016-09-28
  • Publish Date: 2016-11-28
    Abstract
  • We discussed the composition and factors influencing carbon and oxygen isotopes in dolomites and coexisting calcites in hand specimen mesoscale based on petrography and combined with elemental, X-ray diffraction and carbon and oxygen isotope analyses. Results indicated that dolomites have higher δ13C and δ18O values than coexisting calcites. Two factors may account for the higher δ18O values of dolomites. (1) The oxygen isotope fractionation factors of a dolomite-water system are higher than those of a calcite-water system. Therefore, oxygen isotope fractionation factors are greater than 1 in a dolomite-calcite system. (2) The fluids of dolomite precipitation have higher salinity and higher 18O abundance compared to coexisting calcite. In addition, the δ13C values of dolomites show the same trends with δ18O values. That is to say, the carbon isotope fractionation factors in a dolomite-CO2 system are higher than those in a calcite-CO2 system. Therefore, carbon isotope fractionation factors are greater than 1 in a dolomite-calcite system during replacement process. Oxygen isotope values varied obviously between syndepositional dolomites and coexisting calcites, while they were similar between hydrothermal/deeply burial dolomites and coexisting calcites.

     

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