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Negative Anomaly of Carbon Isotope from Carbonates of Sinian Dongpo Formation in Ruzhou and Lushan,Henan Province and Its Geological Significance

ZHANG Liang1,2,DU Yuan-sheng1,3,ZUO Jing-Xun2,ZHOU Qi1 1.Faculty of Earth Sciences,China University of Geosciences,Wuhan430074,China2.Academy of Geological Survey of Henan Province,Zhengzhou450001,China3.Key Laboraratory of Biogeology and Environment Geology of Ministry of Education,Wuhan430074,China  
Sinian Dongpo Formation overlying tillite of Luoquan Formation consists mainly of shales,silty shales and siltstones.Lenticular dolomites,dolomitic siltstones and sandstones are unexpectedly found in Dongpo Formation.Soft-sediment reformation occurs in dolomitic siltstones which are inconsistent with the shales of Dongpo Formation.Negative anomaly of δ13C is found in lenticular dolomites and dolomitic siltstones.δ13C of lenticular dolomites is-4.19‰ to-6.18‰ andδ13C of dolomitic siltstones mostly between-2‰ to-4‰.So it is considered that lenticular dolomites,dolomitic siltstones and sandstones in Dongpo Formation,similar to cap dolomite of Sinian and seep carbonates overlying tillite of Sturtian ice-age in South China,have been formed by interaction between CO2 seeped from gas hydrate and Mg2+ in sea water,that is,lenticular dolomites,dolomitic siltstones and sandstones in Dongpo Formation are the cause of formation of cold spring.
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