Geochemistry and Evolutionary Characteristics of Rare Earth Elements in Ordovician Carbonate-Evaporite Rocks of the Central-Eastern Ordos Basin, Central China.

5.5 Trend of Changes in REEs with the Evolution of Depositional Environment In the C-G-S system of this area, with the improvement of the degree of seawater limitation caused by the falling of sea level, sedimentary sequence of limestone-dolomite-gypsum-salt rocks appeared in turn, and the total amount of REEs also gradually showed a trend of increasing, among which the chondrite-normalized value of REE in carbonate rocks was mostly between 0.5 and 3, which was obviously enriched in light rare earth elements (LREE); the chondrite-normalized values of anhydrite and brownish halite were mostly above 3, and they also had a more obvious trend of light rare earth enrichment.

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In order to provide some possible clues for the analysis of the changes in rare earth element content in different rock types, two sets of trace elements with special indicative significance were also selected to be analyzed.

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