Types of Dolomites and Characteristics of Stable Isotope from the Ma 5 Sub-member of Ordovician Majiagou Formation in Ordos Basin

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  • 1.Institute of Sedimentary Geology,CDUT,Chengdu 610059,China;
    2.Southwest Petroleum University,Chengdu 610500,China;
    3.Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi′an 710018,China

Received date: 2014-04-25

  Revised date: 2014-09-10

  Online published: 2015-04-10

Abstract

The types of dolomites from the Ma 55 sub-member of Ordovician Majiagou Formation in Ordos Basin are micrite,siltcrystal-micrite and siltcrystal dolostones based on petrological analysis and geochemical methods.The results show that micrite dolostone is formed in ungated-restricted environment with high salinity by penecontemporaneous dolomitization,with micrite texture,garnet light in cathoduluinescence observation,lower degree of order.The average value of δ13C,δ18O and 87Sr/86Sr are -1.23‰,-7.59‰ and 0.709 81,respectively.Siltcrystal-micrite dolostone is formed by many dolomitization for penecontemporaneous dolomitization of the micritic dolomite and reflux seepage dolomitization of the siltrystal dolomite in which are many lime-mud or dolomite-mud,whit siltcrystal-fine micrite texture,dirtier,no or extreme dark light in cathoduluinescence,0.75 of degree of order.The average value of δ13C,δ18O and 87Sr/86Sr are -0.43‰,-7.29‰ and 0.709 36,respectively.Siltcrystal dolostone shows the same as siltcrystal-micrite dolostone in cathoduluinescence,but the degree of order is 0.81.The average value of δ13C,δ18O and 87Sr/86Sr are -0.65‰,-6.46‰ and 0.709 67,respectively.These indicate that siltcrystal dolostone is due to buried dolomitization with varying degrees of superimposed dolomitization.

Cite this article

YANG Xi-yan,BAO Hong-ping,REN Jun-feng,MA Zhan-rong . Types of Dolomites and Characteristics of Stable Isotope from the Ma 5 Sub-member of Ordovician Majiagou Formation in Ordos Basin[J]. Natural Gas Geoscience, 2015 , 26(4) : 650 -656 . DOI: 10.11764/j.issn.1672-1926.2015.04.0650

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