Carbon and Oxygen Isotopic Stratigraphy of Mesoproterozoic Carbonate Sequences (1.6–1.4 Ga) from Yanshan in North China
Table 1
Brief lithologies of Mesoproterozoic strata in the research area.
Sections
Formation and lithological association
Thickness/m
Section 3
Tieling Formation
Lower part is grey purple, micritic dolostone, rudite dolostone bearing Mn, and thin bedded calcirudite with dolomitic limestone rhythm in the middle-upper, stromatolite calcareous dolostone in the top
211.11
Hongshuizhuang Formation
Dark grey shale and argillaceous dolomite in the lower, muddy dolostone interbedded with silty and sand dolomite in the upper part.
101.66
Section 2
Wumishan Formation
Dolomicrite with stromatolites and ribbon silica, rhythmic oolitic dolostone, and oncolitic dolostone, and dolomitic limestone in the upper part
2947.15
Section 1
Yangzhuang Formation
Dolomicrite and dolostone with terrigenous clastics and dolostone with robbon chert
322.37
Gaoyuzhuang Formation
Stromatolite dolostone in the lower part, dolomicrite with Mn, nodular limestone in the middle part and thick bedded calcareous dolomite or dolomicrite with ricontaining ribbon chert and breccia dolostone in the upper part
