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Formation of Carbonatite in the Context of Methane Leaking and Its Geochemistry Characters

MI Wen-tian et al (Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059)  
The characteristics of carbonatite formed in the context of methane leaking were significantly different from normal carbonatite.Cold seep carbonate and sinian cap carbonate were considered to be the products in the context of methane leaking,and they had the strongly negative δ13C excursions.Studying on this carbonatite,we found that diagenesis of carbon came from methane,which was resolved by gas hydrate.And they had similar structure,construction and mineral composition.The carbonatite’ s surface construction,rock constituents and the feature of geochemistry were discussed,and the relationship between the characteristics of these carbonate rocks and the formation of the background,process,conditions were expounded.
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