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Volume 37 Issue 5
Oct.  2018
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Article Navigation >  CARSOLOGICA SINICA  > 2018  >  37(5): 659-670
FENG Ke, XU Shenglin, CHEN Hongde, DONG Yixin. Genesis of the Middle Permian dolomite in the southwestern Sichuan basin: Evidence from strontium isotope and rare earth elements[J]. CARSOLOGICA SINICA, 2018, 37(5): 659-670. doi: 10.11932/karst20180503
Citation: FENG Ke, XU Shenglin, CHEN Hongde, DONG Yixin. Genesis of the Middle Permian dolomite in the southwestern Sichuan basin: Evidence from strontium isotope and rare earth elements[J]. CARSOLOGICA SINICA, 2018, 37(5): 659-670. doi: 10.11932/karst20180503
shu

Genesis of the Middle Permian dolomite in the southwestern Sichuan basin: Evidence from strontium isotope and rare earth elements

doi: 10.11932/karst20180503
  • 1.

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

  • 2.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu,Sichuan 610059, China/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu,Sichuan 610060, China

  • 3.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu,Sichuan 610059, China/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu,Sichuan 610061, China

  • 4.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu,Sichuan 610059, China/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu,Sichuan 610062, China

  • Publish Date: 2018-10-25
    Abstract
  • As a high quality oil-gas reservoir, dolomite has long been a focused topic in sedimentology. It is an important appraoch to investigate the origin of dolomite through geochemical analysis to reveal the fluid property. This paper presents a comprehensive study of petrology, rare earth elements (REEs), oxygen, carbon and strontium isotopes in the outcrop sections and drilling samples of Middle Permian, in SW Sichuan Basin. The results show that ①the carbonate has 4 types: limestone, micrite-silty dolomite, finely-medium crystalline dolomite and saddle dolomite. ②The strontium isotope ratio (Avg.0.70977) in the research area is higher than that of contemporaneous limestone and seawater, indicating that dolomitic fluid is foreign. At the same time, some micrite-silty dolomites show the strontium isotopic characteristics of seawater. ③ Compared with normal marine sediments, the carbonate rocks in the research area have higher δCe (0.86 on average), showing an open diagenetic environment. ④Dolomites have higher δEu (0.99 on average) and significantly different REE content and differentiation, implying the dolomite and limestone have different diagenetic fluids and the dolomite has been affected by high temperature. Analysis indicates that the dolomites in southwestern Sichuan Basin are mainly hydrothermal dolomites controlled by structure, and some are thermal convection dolomite reformed by seawater heated by magma and hydrothermal fluid.

     

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