Abstract
Abstract Dolomites from the Ordovician Majiagou Formation are considered as major hydrocarbon reservoir rocks in the Yangshuiwu area, Jizhong Depression. However, the origin of the dolomites remains unclear. This study utilizes a composite analysis of seawater-normalized rare earth elements (REEs), petrography and isotopes (C, O and Sr) to trace dolomitizing fluids and processes. Three types of dolomite are identified: planar-s to nonplanar microcrystalline (type D1) dolomite (
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