Carbonate concretions,usually the products of microbial activity,can provide the information of diagenetic processes.On the basis of field investigation,thin section observation,application of scanning electron microscopy,X-ray diffraction and carbon oxygen isotopes,the limestone and dolomite concretions,abundant in the oil shales of Chang-7(Member 7 of Upper Triassic Yanchang Formation)in Weibei area of the southern Ordos Basin,are studied.It is considered that the limestone and dolomite concretions are pr...
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