Characteristics of Oxygen and Carbon Stable Isotopes for Middle Ordovician Majiagou Formation Carbonate Rocks in the Ordos Basin
Received date: 2012-06-10
Revised date: 2012-07-09
Online published: 2012-08-10
The middle Ordovician Majiagou Formation,which mainly consists of micritic dolomite and limestone, and evaporates,deposited in a restricted epeiric carbonate platform with high salinity in the Ordos basin,China. A part of rocks were reformed into karst breccias by karstification.The δ18Oandδ13Cvalues for the whole rocks or hand\|picked carbonate rocks in the middle Ordovician Majiagou Formation range from -16.0‰ to -1.9‰ (average value =-8.5‰,VPDB) and from -16.1‰ to 4.83‰ (average value=0.90‰,VPDB),respectively.The δ18O and δ13C values for the laser\|micro sampled carbonates in the Majiagou Formation range from -15.8‰ to -0.8‰ (average value=-7.7‰,VPDB) and from -12.4‰ to 5.77‰ (average value=-0.15‰,VPDB),respectively.Although the data measured by two sampling methods do not show the difference, the data measured by the later method give more information about different carbonate components.The originally deposited calcite and limestone have the maximum δ18Ovalue of -5.8‰(VPDB),indicating that it would be δ18O values of original marine carbonates.This result is consistent with the published results of global stable isotope sequence.The means and minimums of the δ18O values for the originally deposited calcite and limestone are low due to meteoric leaching and burial diagenesis.The δ18O values of calcite cements filled in the dissolution pores are generally low under action of meteoric leaching and high temperature burial.The maximum of δ18O values for the originally deposited dolomite formed in the restricted environments with high salinity is obviously higher than that of the originally deposited calcite and limestone.The δ18O values for the dolomite filled in pores are generally low since its formation time was later.The maximum increase δ13Cvalues for the middle Ordovician marine carbonate in Ordos basin would be related to the increase of δ13C value for global marine water during late Ordovician,since the δ13C values for marine water in middle and later Ordovician onset increase.The lowδ13C values for a part of samples are related with the organic carbon mixing.
Key words： Ordos basin; Majiagou Formation; Carbonate rocks; δ18O values; δ13C values
YANG Hua, WANG Bao-Qing, SUN Liu-Yi, REN Jun-Feng, HUANG Zheng-Liang, WU Chun-Ying . Characteristics of Oxygen and Carbon Stable Isotopes for Middle Ordovician Majiagou Formation Carbonate Rocks in the Ordos Basin[J]. Natural Gas Geoscience, 2012 , 23(4) : 616 -625 . DOI: 10.11764/j.issn.1672-1926.2012.04.616
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